528 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Upper lateral sinus of pronotum shallow, about half as deep as the 
lower Crested Pygmy Locust, Nomotettix cristatits, p. 529. 
BB. Median carina low; dorsum relatively flat or gently sloping. Upper 
sinus nearly as deep as lower. 
C. Vertex of head from above wider than an eye, projecting beyond 
eyes, angulate, rounded, or truncate. 
D. Vertex prominent, angxilate, its median carina not at all or but 
very slightly and rarely projecting; joints of antennae relatively 
stout and hind femora slender. 
Angulated Pygmy Locust, 
Acrydium granulatum granulatum, p. 530. 
and 
Broad-shouldered Pygmy Locust, A. g. incurvatum, p. 531. 
DD. Vertex rounded, with projecting mid-carina; joints of antennae 
relatively slender and hind femora stout. 
E. Front of vertex projecting well in advance of eyes, roimded, 
the mid-carina distinct; disk of pronotum sloping roof-wise 
(tectiform) at shoulders. Lateral carinae of pronotum typi- 
cally parallel near front margin. 
F. Middle femora of male enlarged, two-fifths or more as wide 
as long; vertex strongly projecting, with prominent mid- 
carina ; shoulders broad ; sides of hind process of pronotimi 
often concave behind humeral angles. 
Hancock's Pygmy Locust, A. hancocki, p. 533. 
FF. Middle femora of male only one-third (or less) as broad as 
long; vertex less projecting; shoulders narrower; hind 
process of pronotum with sides typically evenly divergent. 
Ornate Pygmy Locust, A. ornatum, p. 532. 
EE. Vertex projecting but little in advance of eyes, nearly trun- 
cate, the mid-carina feebly developed; disk of pronotum 
nearly flat between the shoulders; lateral carinae of 
pronotum often converging backward from the front mar- 
gin; sides of hind process of pronotum usually distinctly 
concave behind the humeral angles. 
Obscure Pygmy Locust, A. arenosum angustum, p. 533. 
CC. Vertex narrow, about as wide as eye, concave in front, with slight 
mid-carina. 
Hooded Pj'gmy Locust, Paratettix cucullatus, p. 534, 
AA. Antennae 22-jointed. Eyes from above distinctly emarginate by 
crown of head. 
Sedge Pygmy Locust, Tettigidea lateralis parvipennis, p. 535. 
