MORSE: ORTHOPTERA OF NEW ENGLAND. 483 
Key to Species of Locustinae (Acridiinae) . 
(See Plates 22, 23.) 
A. Without trace of tegmina or wings; dark olive green above, with or with- 
out a pale dorsal stripe. Length one inch or a little less. 
B. Cerci of male relatively stout, the middle distinctly more than half as 
broad as the base. White Mountain Wingless Locust, Podisma 
glacialis glacialis, p. 492. 
[BB. Cerci of male slender, the middle less than half as broad as the base. 
Varied Wingless Locust, P. glacialis variegata, p. 495.] 
AA. Tegmina present. 
C. Size large, tegmina one inch or more in length. Subgenital plate of 
male deeply notched Schistocerca spp. 
D. Very large, tegmina 42 ( cf ) to 55 ( 9 ) mm. long. Body and tegmina 
brown, conspicuously varied with ashy and yellow stripes and 
dusky spots; mid-dorsal line of head, pronotum, and tegmina, and 
costal margin of latter pale. 
American Locust, Schistocerca serialis, p. 488. 
DD. Smaller, tegmina 26 to 40 mm. long. General coloration ranging 
from rusty brown through yellowish brown to olive green, often 
with a pale dorsal stripe. 
E. Vertex more prominent ; pronotum more compressed and tectiform; 
bright yellow mid-dorsal stripe. 
Leather-colored Locust, S. alutacea alutacea, p. 490. 
EE. Vertex less prominent ; pronotum less compressed; usually with- 
out conspicuous pale mid-dorsal stripe. 
Rusty Locust, S. alutacea rubiginosa, p. 490. 
CC. Size medium or small, tegmina not over an inch in length. 
F. General coloration pale bluish green with a conspicuous purplish 
stripe on mid-dorsal line of pronotum, tegmina, and abdomen. 
Pronotum deeper than broad. Small, 16 to 24 mm. Antennae short, 
about equal to head and pronotum, pink. Hind tibiae greenish 
blue. Cerci of male straight, tapering evenly to a sharp, conical 
point Purple-striped Locust, Hesperotettix brevipennis, p. 495. 
FF. Not as above, coloration usually dull brownish or olivaceous, the 
tegmina always so. 
G. Hind tibiae bright greenish blue. Rather large, hind femora 
slender, of male about 12 mm., of female about 16 mm. long, 
not transversely banded. Tegmina at least twice as long as 
pronotum, unmarked. Antennae very long, of male twice, of 
female one and a half times as long as head and pronotum. 
Cerci of male caliper-like, slender, usually symmetrical, the tips 
a little expanded, incurved. 
Swamp Locust, Paroxya clavuliger, p. 497. 
GG. Not as above Melanoplus spp. [and Phoetaliotes.] 
