344 



ECONOMIC ENTOMOLOGY 



C. Tibia of forelegs with two apical spurs; female with saw-like 

 ovipositor. — TenthredinidcB (Saw-flies) (Fig. 228), p. 345. 

 CC. Tibia of forelegs with one apical spur; female with ovipositor 

 fitted for boring. — Siriddce (Horntatls), p. 350. 

 BB. Abdomen joined to thorax by slender petiole or stalk. 



C. Fore wings with few or no cross veins, hence with no closed cells. 

 D. Ovipositor issuing before the apex of the abdomen; anten- 



FiG. 228. — Venation of a tenthredinid 

 (Janus). (After Comslock.) 



Fig. 229. — Venation of the honeybee. 

 (After Comslock.) 



nae elbowed and with one or more ring-like segments next 

 to last. — Chalcididce (Chalcis Flies), p. 353. 

 DD. Ovipositor issuing from the apex of the abdomen; antenna 

 straight, or if elbowed without ring-like segments. — Proct- 

 otrypidce, p. 351. 

 CC. Fore wings with one or more closed cells. 



Fig. 230. — Venation of an ichneu- 

 monid. (After Comstock.) 



Fig. 231. — Venation of a braconid. 

 (After Comstock.) 



D. Fore wings without a stigma; antenna with not more than 

 16 segments and ?.tm\gU.~Cynipid(B (Gall Flies), p. 351. 

 DD. Fore wings with a stigma; antenna with more than 16 

 segments and straight. 

 E. Fore wing with vein between Media 1 and ist Media 2 

 v/animg.—Braconidce (Braconid Flies) (Fig. 231), p. 

 352- ^ 



EE. Fore wing with vein between Media i and ist Media 2 

 present.—Ickncumonida; (Ichneumon Flies) (Fig. 230), 

 P- 352. 

 AA. Trochanter simple; female usually with a sting. 



