MORSE: ORTHOPTERA Ol' NEW ENULAM). 387 
Oecanthus: Fulton, B. B., "The Tree-crickets of New York: life-history and 
bionomics." Tech. Bull. N. Y. Apric. Exp. Sta., no. 42, 47 pp. (1915). 
" Tree-crickets injurious to orchard and garden fruits." Bull. N. Y. Apric. 
Exp. Sta., no. 388, p. 415-401 (1914). — "Trcc-cricket.s as carriers of Lep- 
tosphaeria conothyrium and other fimgi." Tech. Hull. X. Y. Agric. Exp. 
Sta., no. 50, 22 pp. (1916). 
Tridadylus: Mor.se, A. P., "Variation in TridactyliLs." Psyche, vol. 9, 
p. 97-199 (1901). — Rehn and Hebard, "Studies in the Dermaptera and 
Orthoptera of the coastal plain and Piedmont region of the southeastern 
United States." Proc. Acad. Nat. Sci. Phila., April 191G, p. 283. 
Key to Subfamilies of New England Gryllidac. 
A. Fore tibiae slender, not fitted for digging. Female with conspicuous ex- 
ternal ovipositor. 
B. Second tarsal joint minute, compressed. 
C. Hind tibiae rather stout, armed with stout, movable spines without 
spinules or serrations between them. 
Field-crickets, Gryllinae, p. 387. 
CC. Hind tibiae slender, with delicate spines and short spinules or serra- 
tions between them, or else entirely unarmed. 
Tree-crickets, Oecanthinae, p. 401. 
BB. Second tarsal joint depressed, heart-shaped. 
D. Hind tibiae bearing two rows of spines, without spinules. 
Trigonidiinae, p. 414. 
DD. Hind tibiae with two rows of spines and numerous spinules between 
them Eneopterinae, p. 415. 
AA. Fore tibiae enlarged, fitted for digging. Female without e.xposed oviposi- 
tor. 
E. Large species, over 25 mm. long. Two large ocelli present; hind femora 
but little enlarged; tarsi three-jointed. 
Mole-crickets, Gryllotalpinae, p. 416. 
EE. Small species, less than 10 mm. long. Three small ocelli; hind femora 
greatly enlarged; tarsi one-jointed. 
Pygmy Mole-crickets, Tridactylinae, p. 416. 
THE FIELD-CRICKETS— GRYLLINAE. 
It is with these creatures that the name "Cricket" is most 
commonly associated in the popular mind: black, dark brown, 
or gray insects of medium size, hopping nimbly away from our 
approaching footsteps in field and roadside, hiding beneath what- 
ever shelter offers a refuge, and keeping up an incessant din of 
chirping throughout the warm days and nights of late summer and 
autumn. The black, soft, stout, depressed body, globose head, 
ring-shaped pronotum, and spiny, scrambling legs which char- 
