MORSE: ORTHOPTERA OF NEW ENGLAND. 487 
t. Prosternal spine nearly cylindrical, the tip bluntly rounded, 
often bulbous. Cerci once and a half or twice as long as 
wide, sharply pointed, somewhat acuminate, the sides 
slightly concave. Ovipositor seen from the side with basal 
part of scoop longer, the angle between scoop and stem more 
obtuse. Hind tibiae red. Hind thighs largely or wholly 
lacking transverse dusky bands except on dorsal part of inner 
face. Mid-carina of pronotum frequently distinct on 
prozone Red-legged Locust, M. femur-rubrum, p. 503. 
tt. Prosternal spine tapering, the tip pointed. Cerci shorter, 
only about one and one-third times as long as wide, rather 
dull at tip, the sides straight or convex. Upper valves of 
ovipositor with scoop shorter, the angle at junction with 
stem more pronounced. Hind tibiae either glaucous or 
red. Hind thighs usually with conspicuous dusky oblique 
bands. Mid-carina of pronotum seldom distinct on pro- 
zone. 
Lesser Migratory Locust, M. mexicanus atlanis, p. 499. 
ss. Tegmina and hind thighs immaculate or showing only faint 
traces of spots or bands. No angulation at junction of 
scoop and stem of ovipositor. Prozone fuller proportion- 
ally, the dorsal line of pronotum horizontal. Interspace 
usually subquadrate or transverse. 
Northern Locust, M. borealis, p. 506. 
, Tegmina usually not passing end of hind thighs; body relatively 
stout, and prozone full (giving a thick-necked appearance). 
Interspace between mesosternal lobes usually subquadrate or 
transverse (rarely quadrate). 
u. Tegmina reaching to about the end of the hind thighs. Inter- 
space but little transverse. 
V. Scoop of ovipositor very short, deeply concave, with a single 
or no denticulation at base of outer edge; lower valves 
with the tips correspondingly short and decurved. Hind 
tibiae usually glaucous but often red. Tegmina flecked 
with dusky and pale spots, hind thighs obhquely banded. 
Lateral carinae of pronotum usually bordered below on 
the prozone by a broad fuscous stripe which is crossed 
obliquely by a distinct, narrow pale line. Prozone less 
inflated than in next species and body less robust. 
Little Locust, M. confusus, p. 507. 
vv. Scoop rather long, the outer edge of basal half crenulato- 
denticulate, the tips of both pairs of valves long and 
evenly tapering. Hind tibiae coral red. Fuscous stripea 
on prozone indistinct, often lacking. Tegmina maculate 
and hind thighs obhquely banded. A robust species with 
noticeably swollen prozone and a thick-necked aspect. 
Broad-necked Locust, M. luridus, p. 509. 
