154 
THIRTEENTH REPORT. 
to a variable extent and also variable in form; so that they and the 
cerci furnish characters much used in separating the species from one 
another. * * * The tyro will probably have much difficulty in sepa- 
rating the females of the different species.” — Blatchley. 
10. Melanoplus atlanis (Riley). — Vertex about the width of the 
basal joint of antennae; sulcate; continuous with frontal costa, which is 
sulcate at the ocellus only, and widens centrally; foveolae triangular. 
Antennae compressed in the basal third, longer than head and prono- 
tum. Margin of pronotum rounded or truncate anteriorly, obtuse-angled 
or rounded posteriorly ; median carina much more distinct on metazona 
than on prozona; lateral carinae distinct; prozona about the same length 
as the metazona. Tegmina narrow, longer than the abdomen. Hind 
femora stout, slightly shorter than the abdomen. Sub-genital plate of 
male with a median apical notch. Length of furcula about three times 
their average width. Cerci narrowing slightly from base to extremity, 
sub-spatulate. 
General color, dull brown. Face yellowish; occiput nearly black; pro- 
notum fuscous, with a black stripe on the lateral lobe back from the eye. 
Tegmina transparent, with fuscous veins, and small fuscous spots, usu- 
ally arranged in a row from the shoulder to the tip. The ventral side 
of the abdomen of the male yellow, of the female, yellow sprinkled with 
fine fuscous dots. Hind femora yellow on inner face; outer face yellow 
with three faint fuscous bars; knees black; tibiae red, at least on apical 
third, spines black. 
Measurements: — Length of body, male, 20 mm., female, 23 mm.; teg- 
mina, male and female, 20 mm.; hind femora, male, 12 mm., female, 13.5 
mm. 
11. Melanoplus femur-rubrum (Ue Geer). — Occiput indistinctly cari- 
nate; vertex deeply sulcate, distinctly separated from the frontal costa, 
which has parallel sides and is sulcate only below the ocellus. Foveolae 
lacking. Antennae flattened in the basal third. Pronotum truncate 
anteriorly, rounded or obtuse posteriorly, carinate throughout, but 
more distinctly on the metazona; only the last of the three sulci cuts the 
median carina, making the prozona and metazona the same length ; 
lateral carinae straight, distinct; lateral lobes of prozona smooth, of 
metazona, finely and densely punctate. Tegmina of the female reach to 
or slightly beyond the tip of the abdomen; in the male they extend one- 
fourth of their length beyond the abdomen. The hind femora do not 
quite reach the tip of the tegmina in either sex. Furcula of male three 
times as long as wide at the base, curved from the base outward, and 
then inward, and placed in grooves of the supra-genital plate. Cerci 
only half as wide at the middle as at the base, tapering to the end, 
curved inward. Sub-genital plate pilose. 
General color, olive brown; face yellowish or greenish, occiput oliveo- 
fuscous; disk of pronotum red-brown, lateral lobes the color of the face, 
with a black stripe from the eye across the prozona. Tegmina wood 
brown with very small fuscous dots. Hind femora yellowish brown, 
shading, on the lower border, to reddish; four black cross-bars on the 
upper inner surface; the outer surface immaculate; tibiae red, spines 
black. 
Measurements: — Length of body, male, 18 nun., female, 25 mm.; teg- 
