336 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
AA. Entirely apterous, ■without even rudiments of tegmina and wings. Strid- 
ulatory and auditory organs apparently absent. 
Cave-crickets, Subfamily Stenopelmatinae, p. 373. 
THE ROUND-HEADED KATYDIDS— AMBLYCORYPHA. 
New England is inhabited by three species of large, Round- 
headed Katydids belonging to the genus Amblycorypha. Two 
species probably occur throughout the Transition area as far 
north as southern Maine, New Hampshire, and Vermont; the 
other has as yet been found only in southern Massachusetts, 
but probably occurs in coastwise Connecticut also. 
The head is round and full; the vertex broad, smooth, convex, 
without groove or projections; eyes of moderate size, elliptic; 
pronotum flat above and more or less narrowed anteriorly, 
abruptly bent downward at the sides, its front margin straight or 
a little concave, hind margin convex; lateral lobes varying from a 
little deeper than long to the reverse, their front margin concave, 
hind margin strongly convex, the humeral sinus rectangular or 
obtuse-angled. The legs are long and slender; the hind femora 
weak, with from 1 to 5 short spines beneath, and equalled or 
slightly exceeded by the hind tibiae. The tegmina equal or 
pass the hind knees by 4 to 6 mm., and are surpassed as much by 
the wings, with dorsal area small and horizontal, lateral area 
flat, nearly vertical. Subgenital plate of male V-emarginate ; 
cerci not reaching its hind margin, rather stout, gently incurved, 
tapering to an acute, spur-like tip. Ovipositor large, broad, 
curved upward scimitar-like, the distal half of its dorsal edge and 
third of the ventral edge set with numerous prominent, nearly 
erect and symmetrical, and rather widely placed teeth. 
In color these Katydids are usually a dull pea-green, very pale 
or nearly white beneath, with the dorsal area of the male teg- 
mina purplish brown. In drying, specimens are particularly 
apt to discolor, becoming yellowish brown, unless stuffed or 
treated with formaldehyde. Rarely, examples are found of a 
bright rose-pink color, a phenomenon concerning which various 
theories have been advanced but which has not yet been satis- 
factorily explained (for bibliographical references to this subject 
and to experiments see Ent. News, vol. 27, Feb. 1916). 
