Yale Peruvian expeditions, 1911-1915.
Publications no. 32.

J

"/gibe theft Books
\ for the founding of a Collegi in /his Ceton.fl

• YALE-^MViEiasinnr-

ML

RESULTS OF THE YALE PERUVIAN EXPEDITION
OF 1911. ORTHOPTERA (EXCLUSIVE
OF ACRIDIID^E)

BY

A. N. CAUDELL
Of the Bureau of Entomology, United States Department of Agriculture

No. 1956.— rFrom the Proceedings of the United States National Museum,
Vol. 44., pages 347-357
^Published February 20, 1913

Washington
Government Printing Office
1913

RESULTS OF THE YALE PERUVIAN EXPEDITION OF 1911.
ORTHOPTERA (EXCLUSIVE OF ACRIDIHLE).

By A. N. Caudell,
Of tlie Bureau of Entomology , United States Department of Agriculture.

The Peruvian localities mentioned in this paper are for the most
part absent from printed maps and geographical indices. Most of the
Orthoptera taken by the expedition were collected at a few localities
in southeastern Peru. Pampaconas River, a locality given for a
goodly number of species, is an uncharted stream flowing between
the Urubamba and Apurimac Rivers.
By previous agreement representatives of all Orthoptera taken by
the expedition and the types of all new species are deposited in the
United States National Museum. Family BLATTID^.
CHORISONEURA PERUANA, new species.
Allied to C. peUucida Saussure, from Mexico.
Male. — Color a nearly uniform brownish yellow, the disk of the
pronotum with the underlying part of the thorax showing through
as a darker central portion. Pronotum broadly rounded anteriorly
and behind almost truncate. Elytra extending much beyond the tip
of the abdomen; wings with an apical area about as long as broad
acuteangulate basally and apically extending barely beyond the tip
of the costal field, broadly rounded and faintly notched mesially.
Supraanal plate broadly transverse and very obtuseangulate apically;
subgenital plate small and succeeded by a pair of upwardly directed,
basally broadened styles. Legs slender, the femora unarmed be
neath except with short bristles.
Length, entire from front of head to tip of elytra, 13 mm.; prono
tum, 2 mm. ; elytra, 1 1 mm.
Type. — One male, Huadquina, July 31, 5,000 feet altitude. Cat.
No. 15046, U.S.N.M. Proceedings U. S. National Museum, Vol. 44— No. 1956. 347

348 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.44.
ISCHNOPTERA PAMPACONAS, new species.
A medium sized blackish red-brown species apparently differing
from any described species recorded from Peru or surrounding
regions. Female. — Size medium; body depressed; form elongate, the closed
wings surpassing the tip of the abdomen by fully a third their length;
head no.t quite concealed beneath the pronotum; ocelli large and
situated sublaterally next the inner-upper margin of antennal scrobse
next the eye; interocellar space broader than the interocular space,
which is about as broad as the width of one eye; antennae covered
with fine short hairs. Pronotum narrowly rounded in front and
broadly rounded behind, the sides deflexed, the disk dimpled on each
side of the middle. Elytra long and slender, semi-coriaceous, the
veins fairly distinct, the costal field long and narrow; wings in repose
as long as the tegmina, transparent, the anterior field apically a little
infuscated; ulnar vein with two complete branches extending to the
apex and with seven or eight incomplete veins; there are more than
a dozen costal veins, two or three of which are forked and many of
them apically somewhat swollen. Legs slender, the anterior femora
armed beneath on the front margin with three or four stout spines
on the basal half followed on apical part by a row of fine short ones;
arolia between the claws very small and inconspicuous, often hard
to see. Supraanal plate considerably produced and apically rounded ;
subgenital plate broad and posteriorly broadly rounded, entire; cerci
stout and long, finely haired.
General color a very dark-reddish brown, the pronotum almost
uniformly black and the legs light yellowish, as are also the mouth
and palpi. The ocelli are a transparent reddish, the antennae brown
and the costal margin of elytra is anteriorly a little lighter. The
elytra are posteriorly a little more transparent and thus less dark.
Length, total from head to end of elytra, 18 mm.; pronotum, 3
mm.; elytra, 14 mm.; width, pronotum, 3.5 mm.; elytra at widest
point, 4 mm.
Type. — One female Pampaconas River, August. Cat. No. 15047,
U.S.N.M. It may have been this species which Bolivar recorded from Peru *
as /. con8obrina. ISCHNOPTERA IGNOBILIS Saussure,
One female, Pampaconas River, August.

i Anal. Soc. Espan. Hist. Nat., vol. 10, 1881, p.

no. 1956. TALE PERUVIAN EXPEDITION, ORTHOPTERA— CAUDELL. 349
BLATTELLA STYLATA, new species.
A moderate sized species apparently somewhat allied to B. peruana
Shelford and other species described by that author. In some of the
characters, however, it differs from those given for any of the described
forms. Male. — Palpi with the last segment considerably enlarged basally
and tapering from there to the tip, beneath brownish; antennae
slender and sparsely hairy. Pronotum truncate posteriorly, anteri
orly very broadly rounded, the sides broadly translucid. Elytra
extending distinctly beyond the tip of the abdomen and, except for
the brownish cross veinlets, nearly uniform in color; wing with eleven
apically swoNen costal veins ; ulnar vein five-branched, the first and
second branches confluent apically. Femora all well armed beneath,
the anterior ones armed beneath along the entire margin, the spines
growing gradually shorter toward the apex. Supraanal plate broadly
transverse, apically entire; subgenital plate large, slightly longer than
broad and apically prolonged at each side as a style-like projection,
which is apically armed with two or three very small but stout spines,
and between these projections there are two apically more or less
expanded asymmetric organs which are very finely serrate, or spined,
on the inner margin; cerci long, stout, and strongly depressed.
Color clear yellowish brown, the disk of the pronotum with some
small oblique black dashes and the cross veins of the elytra brown;
abdomen beneath mesially fuscous to the base of the terminal seg
ment and with smaller dark maculations along the margins; the
tarsal joints, except the first, are partially black and the tibiae on the
outer side bear conspicuous black spots at the base of the spines;
femora unicolorously yellowish brown except for small blackish spots
at the base of the ventral spines beneath on the middle and hind
pairs; the face has some blackish lines and dashes.
Length, entire from front of head to end of elytra, 14 mm.; pro
notum, 3 mm.; elytra, 11 mm.; width, pronotum, 4.5 mm.
Type. — One female, San Miguel, September 1, 6,000 feet altitude.
Cat. No. 15048, U.S.N.M. PH03TALIA L.fflVIGATA Beauvois.
One male, Huadquina, July 30, 5,000 feet altitude; one female,
same locality, July 31. EPILAMPRA, species.
One male, one female, San Miguel, July 24, 6,000 feet altitude; one
female, Lucma, August 7, 7,000 feet altitude; one female, Pampa
conas River, August.
In the present state of our knowledge of the species of this genus it
is scarcely possible to determine these specimens specifically. The
female specimen from Pampaconas River has the elytra extending to

350 PROCEEDINGS OF THE NATIONAL MUSEUM. TOL- 44-
the tip of the abdomen, while in the other females they fall distinctly
short of it; otherwise they are similar.
BLATTA TINCOCHACA, new species.
Female. — The smallest species of the genus known to me. Head
moderately exposed, the eyes small and wide apart and very incon
spicuous, the interocular space more than twice as broad as the space
between the antennae; ocelli scarcely noticeable; terminal segment
of the palpi swollen basally, tapered apically. Pronotum truncate
posteriorly, anteriorly subtruncate above the head and then, together
with the sides, rounded. Legs moderately stout, the fore femora
scarcely spined beneath, but the middle and hind ones quite strongly
spined, the spines few in number; arolia between the tarsal claws
small but distinct. Wings rudimentary; elytra short, about as long
as the pronotum and posteriorly very broadly rounded, almost trun
cate, dorsally separated by a space equal to about one-fourth the
width of one of them. Abdomen short and broad, the supraanal
plate broadly triangular, about twice as 'broad as long, apically
entire; subgenital plate valvular as in Blatta orientalis except the
slit is more apical, extending a lesser distance toward the base.
General color black, the legs yellowish brown with the femora and
tibiae black at each end and the joints of the tarsi blackish; the abdo
men is a little lighter below than above and the margins of the seg
ments, especially beneath, are obscurely yellowish; pronotum and
costal margin of elytra yellowish, about one-fouith of the elytral
width occupied by this yellowish margin; head entirely black except
a lightish tinge about the mouth parts, the eyes and vertex uniformly
black, the eyes very inconspicuous; antennas dark brown, nearly
black, with the basal part growing yellowish.
Length, entire from front of head to end of abdomen exclusive of
cerci, 6.5 mm.; width across widest part of abdomen, about 3.5 mm.
Type and paratype. — Two females, Tincochaca, August 8, altitude
7,000 feet. Cat. No. 15049, U.S.N.M.
OXYCERCUS PERUVIANUS Bolivar.
One female, Torontoy, July 22, 8,000 feet altitude.
DASYPOSOMA NIGRA Bruner.
Five female specimens ranging from apparently full grown to one
less than one-half inch long. All from Urubama, Peru, July 11,
9,500 feet altitude. Family PHASMID^.
AUTOLYCA TRANSVERSATA, new species.
Allied to A. .picturata Redtenbacher and runs to that species in
the table of species in the works of that author.1 The posteriorly
1 Ins. Fam. Pliasm., p. 95. 1908.

no. 1956. YALE PERUVIAN EXPEDITION, ORTHOPTERA— CAUDELL. 351
margined segments of the thorax and abdomen will readily separate
these two species.
Male and female. — Head subquadrate, about as broad as long;
antennae of the usual structure, the basal segment flattened. Pro
notum about the same in width and breadth, the mesonotum about
twice as long as the pronotum and slightly broader; intermediate
segment obscurely indicated, subequal in length with the metanotum
from which it is usually separated by a couple of small subdorsal
transverse light-colored spots. Abdomen moderately swollen in the
female, in the male parallel sided, the segments transverse, female,
or quadrate, male. Operculum of female nearly as broad as the
segment of the abdomen from which it arises, reaching to the tip
of the last segment and apically slightly acuteangulate; operculum
of the male large, fully as broad as the last segments of the abdomen.
Cerci of both sexes simple, short and stout, in the female straight,.
in the male almost straight. All the femora distinctly carinate,
the anterior one almost straight, at the base very slightly curved;
tibiae also carinate, the sides sulcate; tibiae generally lighter colored
beneath and covered with fulvous pile. The whole insect is covered
with short hairs or pile as is common in the genus.
General color velvet black, the antennae ringed with whitish
yellow and the segments of the abdomen and thorax posteriorly
margined above with white. The tip of the femora is distinctly
light colored, as is also the base of the tibiae for a very short distance
and the tip of the tibiae and base of the first tarsal segment is more
or less whitish. Clypeus also light yellowish.
Length, entire, male, 30 mm., female, 45 mm.; antennae, male,
27 mm., female, all but 15 mm. gone; mesonotum, male, 5 mm.,
female, 8 mm.; fore femora, male, 9.5 mm., female, 11 mm.; cerci,
male and female, 1.5 mm.
Holotype.— One male, Huadquina, Peru, July 26, 1911, 5,000 feet
altitude. Allotype— One female, July 30, same locality; one male paratype,
same data as the holotype. Holotype and allotype, Cat. No. 15050;
U.S.N.M. Family LOCUSTID^.
DASYSCELUS, species.
One immature female. Pampaconas River, August.
This may be the D. planiusculus of Brunner, but the immature state
of the only specimen represented prohibits its specific determination.
NANNOTETTIX PALTAYBAMBA, new species.
A species most nearly related to N. guentheri Brunner and running
to that species in Brunner's tables. It differs, however, from guen
theri in several particulars, besides being considerably larger.

352 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 44.
Male. — Fastigium of the vertex elongate triangular, sulcate dor
sally and not surpassing the antennal scrobae; eyes moderately
prominent; antennae slender, much longer than the body. Pro
notum ruggose both above and on the lateral lobes, truncate behind,
subtruncate before, the anterior transverse sulcus distinct but not
so conspicuous as the median sulcus; lateral lobes considerably
longer than high, the lower margin straight, humeral sinus distinct
but broad; no median nor lateral carinae but the shoulders behind
the median transverse sulcus are somewhat angular; disk anterior
of the median transverse sulcus very finely sulcate longitudinally
down the middle line; prosternal spines well developed. Legs
moderately stout; anterior tibiae with conchate foramina, the dorsal
surface broadly and shallowly sulcate and unarmed; middle tibiae
similar to the front but armed on the posterior margin above with
six small short stout sharp spines; both fore and middle tibiae
armed beneath on both margins; hind tibiae armed beneath with
a number of small spines in two series, those on the apical part situated
opposite, those on the basal part further apart and alternate; above
armed on both margins, an apical spine present only on the inner
side; femora moderately stout, all the geniculations unarmed except
those of the middle legs on the inner side which are spinose; all
femora unarmed above, armed beneath with a single row of spines
on the outer carina of the fore and middle legs and the inner side of
the fore legs. Abdomen plump; subgenital plate elongate, apically
narrowed and notched, each angle bearing a heavy style about four
times as long as broad, apically rounded and barely tapering; cerci
subsphaerical with a short sharply pointed curved tooth on the inner
side; supraanal plate apically rounded, deflexed and broadly dimpled
above. Elytra very little longer than the pronotum, posteriorly rounded
and with a well-developed speculum and distinct veins. Wings
concealed beneath the elytra and equaling about two-thirds their
length. General color yellowish; head above with three longitudinal
black streaks, the middle one extending anteriorly over the top of
the fastigium of the vertex and the lateral ones smaller and extend
ing from the top part of the eyes to the back of the head; the basal
segment and scrobae of the antennae are mostly black and the face
has blackish spots; the pronotum is wholly black in front .of the
anterior transverse sulcus and the shoulders and the middle of the
posterior part of the disk is also black; all the spines of the legs and
also the extremities of the femora and tibiae are blackish; elytra
blackish with conspicuous yellowish veins.

no. 1956. YALE PERUVIAN EXPEDITION, ORTHOPTERA— CAUDELL. 353
Length, entire from front of head to end of body, 32 mm.; pro
notum, 9 mm.; elytra, 11 mm.; fore tibiae, 11 mm.; fore femora,
10 mm.; hind femora, 24 mm.
Type. — One male. Paltaybamba, August, 5,000 feet altitude.
Cat. No. 15051, U.S.N.M.NANNOTETTIX PERUVIANUS, new species.
Male. — Similar to the last, but smaller and with longer wings. In
Brunner's table of species it runs to elongatus, but it is a larger species
than that more southern form. Head as described under N. paltay
bamba. Pronotum rugose both above and on the lateral lobes,
truncate posteriorly, anteriorly a little rounded, both transverse
sulci distinct, about equally so, but neither conspicuous; lateral lobes
distinctly longer than high, the lower margin straight, the hind
margin almost straight and perpendicular, no distinct sinus present;
no median nor lateral carinae present but the shoulders a little angular; '
prosternal spines well developed. Legs moderate ; anterior tibiae with
conchate foramina, the dorsal surface shallowlyand broadly sulcate and '
unarmed; middle tibiae flat above and armed on the posterior margin
wijth four very minute sharp tubercles; both fore and middle tibiae
armed beneath on both margins; hind tibiae armed beneath in the
apical half with a number of spines, mostly in two series, above armed
on both margins, an apical spine present only on the inner side, the
last spine on the outer side being far removed from the apex; femora
moderately stout, all the geniculations unarmed, all the femora
unarmed dorsally and below narrowly sulcate, the outer margin of the
hind and middle leg and the inner margin of the front ones thin and
elevated and armed, the number of spines being four or five on the
hind, two on the middle, and one on the fore femora, an additional
aborted one showing on the left fore leg; the inner carina of the
femora is less elevated, on the hind leg scarcely developed at all, and
unarmed. Elytra twice as long as the pronotum but failing to reach
the tip of the abdomen, apically narrowly rounded. Wings not
quite as long as the elytra, completely concealed' beneath them.
Abdomen plump; subgenital plate and apical styles as in paltay
bamba; cerci heavy, about three times as long as broad, round and
apically bent inward and rapidly tapered to a sharp point.
General color yellowish; head above with two very fine postocular
longitudinal streaks of black, and a similar one situated mesially,
very small and on top spread into a cruciform spot; fastigium of
vertex and the first two joints and the scrobae of the antennae mostly
piceous and the eyes mottled with fuscous; upper margin of clypeus
lined most of the distance with black and a descending outward
curving line of the same color extends from the inner lower margin
of the eyes to near the clypeal suture; extreme tip of mandibles
69077°>— Proc.N.M. vol.44— 13  23

354 PROCEEDINGS OP THE NATIONAL MUSEUM. vol. 44.
black. Pronotum with a longitudinal black band which spreads
across the dorsal width on the fore and hind margins of the disk
and extends down along the margins of the lateral lobes as a very
fine line. Except for the black spines with dark reddish tips the legs
are nearly uniformly brownish yellow, the posterior geniculations
slightly infuscated.
Length, entire from front of head to tip of abdomen, 23 mm. ; pro
notum, 5.25 mm.; fore tibiae, 8 mm.; fore femora, 8 mm.; hind
femora, 15 mm.; elytra, 14 mm.
Type.— One male, Huadquina, July 30, 5,000 feet altitude. Cat.
No. 15052, U.S.N.M. NANNOTETTIX, species.
Two immature specimens, one male and one female, from same
locality as N. peruvianas and with same data. If these nymphs are
those of N. peruvianus, they show that species to be indeed variable,
as these specimens are not like the adult in structure or coloration.
The infuscation of the pronotum, instead of forming a median band,
js dim and follows the location which the lateral carinae would occupy
were such present. The fastigium of the vertex and the two basal
segments of the antennae are scarcely infuscated instead of piceous
as in the adult of peruvianus and the face is marked by four black
spots and streaks. The anterior femora has three spines on the inner
carina beneath.
Another immature specimen, a male from same locality but taken,
four days earlier, probably belongs to this genus. Here the whole
insect is mottled with blackish, the antennae and legs conspicuously
annulate and the face solidly piceous and shining.
ANAULACOMERA MACUUCORNIS, new species.
As indicated by the specific name, this species is separable from
its allies by the black marked antennae.
Male. — Fastigium of the vertex elongate triangular, abruptly nar
rowing about the middle and dorsally sulcate, the margins elevated
and, on the posterior half, much thickened or swollen; the whole
vertex is directed upward somewhat and the tip is very narrow and
beneath it the apex is concave and meets the pointed facial vertex;
the antennal scrobae extend beyond the tip of the vertical fastigium.
Eyes round, prominent, moderate in size. Pronotum flat longitudi
nally above but tending to transverse concavity between the somewhat
sharp shoulders; lateral carina scarcely indicated except posteriorly
pronotal disk very broadly and roundly concave both before and
behind, the lateral angles very broadly rounded; lateral lobes about
as high as long, rounded below and behind, anteriorly nearly straight,
the humeral sinus sharp and distinct; the sulci of the pronotum not
conspicuous; on the posterior part of the disk there are a couple of

no. 1956. YALE PERUVIAN EXPEDITION, ORTHOPTERA— CAUDELL. 355
inconspicuous longitudinally disposed elevated ridges. Legs slender;
anterior tibiae with open foramina on each side, the dorsal surface
slightly sulcate and armed about the middle with a small spine on
either side and apically on the outer side with a spine so minute as to
be barely visible in certain lights only; x middle tibiae more distinctly
sulcate above than the fore ones and unarmed on the outer margin, the
inner margin with several small spines, the terminal one distinct; hind
tibiae distinctly longer than the corresponding femora and armed
above and below with many stout spines on both outer and inner
margins, apical spines above on both sides. All the femora armed
beneath with a few serrations or teeth on one margin only, the genic
ulations short but acute. Elytra with fully two-thirds their length
projecting beyond the abdomen, the wings surpassing considerably
the elytra, the projecting part green and more opaque than the trans
parent membraneous portion; the elytra are narrow and slender with
the veins inconspicuous, the margins nearly parallel and apically
narrowly rounded. Abdomen moderate, short; subgenital plate
mesially keeled longitudinally beneath, apically narrowed and
squarely notched, the lateral angles long and styliform, not provided
with free styles; supraanal plate broad and apically truncate; cerci
cylindrical, seven or eight times as long as broad, gently curved inward
and apically briefly and gently hooked, the tip forming a short stout
naked tooth, the rest of the cercus hairy.
General color greenish; antennae conspicuously marked on the
inner side, except on the basal segment, with black for some distance
at least from the base, the outer portion being absent in the only speci
men seen. The elytra have several ocellate spots, composed of a num
ber of minute dusky specks with a central black dot, and, especially
along the anal margin, with many minute black specks visible only
tinder a glass; the tympanal field is black with the central portion
yellowish green; the hind tibiae beneath has small black areas at the
bases of the spines and the geniculations of the hind femora are
infuscated. Length, entire from front of head to end of wings, 38 mm.; fore
femora, 6 mm.; middle femora, 9 mm.; hind femora, 18 mm.; hind
tibiae, 20 mm. ; elytra, 32 mm. ; wings beyond elytra, 4 mm. ; width,
elytra at middle, 5 mm.
Type. — One male, Pampaconas River August. Cat. No. 15053,
U.S.N.M. ANAULACOMERA SULCATA Brunner .
One male, Huadquina, July 30, 5,000 feet altitude.
i More material is necessary to determine if the fore femora are to be classed as with or without an apical
Spine.

356 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 44.
PHYLLOPTERA FAMULA Brunner.
One male, Pampaconas River, August.
PHYLLOPTERA SERVA Brunner.
One male, Pampaconas River, August.
MICROCENTRUM PERUVIANUS ? Scudder.
One female, Pampaconas River, August.
I have determined this specimen as peruvianus with some doubt,
the type being of the opposite sex and unavailable for examination
at this time, the determination being based on the description only,
with which, however, this female agrees fairly well, allowing for
sexual differences. Family GRYLLID^E.
RIPIPTERYX RIVULARIA Saussure.
Two males, two females, Santa Ana, August 4, 3,000 feet altitude.
RIPIPTERYX FORCEPS Saussure.
Three males, one female, San Miguel, July 24, 6,000 feet altitude;
one female, Lucma, August 7, 7,000 feet altitude.
This series shows that the yellow color of certain segments of the
antennae is not good as a specific character. The specimen from
Lucma, which is just like the San Miguel specimens otherwise, has the
antennae unicolorously black, no segment showing any yellowish.
One of the San Miguel females has the 6, 7, and 8 segments entirely
yellow, while the other three have only the 6 and 7 so colored, and
then often the apical part of one or both of these segments are black.
ANUROGYRYLLUS MUTICUS DeGeer.
One male, one female, two nymphs, Huadquina, July 26, 5,000
feet altitude.
The male has fully developed elytra but the wings are aborted,
while in the female the wings are caudate.
ANUROGRYLLUS FUSCUS, new species.
A blackish species slightly above the usual size of its allies.
Female. — Head as broad as the front of the thorax, the eyes ocelli
and mouth parts as in muticus. Pronotum a little broader than long
the lateral lobes bent gently inward on the posterior lower angle the
lower margin straight, descending slightly anteriorly, the fore and
hind angles rounded; the anterior margin of the pronotal disk is
very broadly and gently concave and the posterior margin corre
spondingly convex. Elytra as long as the abdomen and apically
pointed; wings caudate, extending about half their length beyond
the elytra. Legs moderate, the posterior metatarsus large, but little

no. 1956. YALE PERUVIAN EXPEDITION, ORTHOPTERA— CAUDELL. 357
swollen; upper inner calcar of hind tibiae a little longer than the
middle one and gently curved; the inner apical calcar of the posterior
metatarsus is very large and almost half as long as the metatarsus,
about twice as long as the outer calcar. Ovipositor rudimentary as
usual in the genus.
Male. — Similar to the female except that the wings are aborted,
the elytra, however, long and apically pointed as in the female. The
lateral field of the elytra is also lighter and the lateral lobes of pro
notum bear a fleck of yellowish on the lower front corner.
General color blackish above and yellowish beneath. The legs
and mouth parts and venter of abdomen are yellowish brown, while
the whole upper surface of head, thorax, and elytra is blackish brown,
almost black; the wings and lateral field of the elytra are a little
lighter than the dorsal surface; the lateral lobes of the pronotum are
uniformly blackish; antennae brown.
Length, from front of head to end of elytra, male and female, 20
mm.; pronotum, male and female, 4 mm.; elytra, male and female,
13.5 mm.; hind femora, male and female, 12.5 mm.; wing beyond
elytra, female, 12 mm. ; width, pronotum, male and female, 5.5 mm.
Type. — One male, one female, Pampaconas River, August. Type,
female, paratype male. Cat. No. 15054, U.S.N.M.
The three species of this genus occurring in South America, one of
which I consider as of varietal rank only, may be separated as follows:
Lateral lobes of pronotum uniformly yellowish or infuscated only centrally.
Vertex of head unicolorous  !  muticus DeGeer.
Vertex of head marked by three or four longitudinal lines.
muticus var. clarasAanus Saussure.
Lateral lobes of pronotum almost or quite uniformly blackish. . fuscus, new species.
All these forms are dimorphic in wing length, some having the
wings caudate and others with them abortive.
GRYLLUS, species.
Eight immature specimens, two from Urubamba, July 15, 9,500
feet altitude; three from San Miguel, July 24, 6,000 feet altitude;
three from Huadquina, July 14, 5,000 feet altitude. These may
represent two or more species.
AMUSUS KTRSCHIANUS Saussure.
One female, Pampaconas River, August.
This is considerably smaller than the measurements given for the
type, but otherwise fits the description very well.
ENEOPTERA SURINAMENSIS DeGeer.
One female, Santa Ana, August 4, 3,000 feet altitude.