MORSE: ORTHOPTERA OF NEW ENGLAND. 427 
Key to the New England Species of Acridinae. 
(See Plate 20.) 
A. Antennae much enlarged at base, tapering to a |)oint, the segments pris- 
matic Bunch-grass Locust, Pseudopomala brachyplera, p. 428. 
AA. Antennae sHghtlj^ enhirged at tip, scarcely a.s long as head and |)ronotum. 
Crown of head and di.sk of jironotuin with a supernunierar}' carina 
on each side of the median. Inner apical spurs of hind tibiae of very 
unequal length Velvet-striped Locust, Erilellix simplex, p. 4.30. 
AAA. Antennae thread-like. No supernumerary cariiiac. Iiuicr apical 
spurs of hind tibiae about equal. 
B. Tegmina without well-developed intercalary vein. 
C. Foveolae visible from above as deep, linear impressions. 
Meadow Locust, Chorthippns curtipennis, p. 440. 
CC. Foveolae not visible from above, — often shallow or wanting. 
D. AntenrAe short, about equal to head and pronotum together. 
Wings functional, though sometimes quite small, with ^ opaque 
thickening on front margin at apical third. 
E. Sides of pronotum elongate, the length on the dorsal margin 
greater than the depth; lateral carinae parallel and di.sk of 
one color. Foveolae absent. 
Bicolored Locust, DichromorpJia viridis, p. 432. 
EE. Sides of pronotum not elongate; lateral carinae more or less 
divergent before and behind, and disk particolored on meta- 
zone. Foveolae iLsually present on front of vertex. 
F. Vertex of head blunt, rounded, obtuse ( 9 ), or rectangular 
(cT), scarcely narrowed between eyes, its central depression 
close to apex. Lateral carinae of pronotum Uttle incurved, 
the distance between them but little greater at hind than at 
front margin, especially in female. Prozone longer than 
metazone Pasture Locust, Orphulella speciosa, p. 435. 
FF. Vertex of head rectangular, or a little acute in male, a little 
narrowed between the eyes, its central depression removed 
from apex one-third (cf) to one-fourth (?) the width of 
the vertex. Lateral carinae of pronotum strongly incurved, 
and the distance between them at hind margin much 
greater than at front margin. Prozone and metazone 
about equal on mid-line. 
Spotted-winged Locust, Orphulella pdidna, p. 436. 
FFF. Vertex of head acute, the sides often concave in male, 
distinctly narrowed between eyes, the central depression 
farther removed from apex. Lateral carinae of pronotum 
little incurved but the distance between them much 
greater at hind than at front margin. Prozone longer 
than metazone. 
Salt-marsh Locust, OrphuleUa olivacea, p. 437. 
