258 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



not much broader than petiole, first dorsal abdominal seg- 

 ment slightly geniculate Agrothereutes p. 330 



126. Outer vein of third discoidal cell bent beneath apex; malar 



space prominent Joppidium p. 330 



Outer vein of third discoidal cell straight; malar space not 

 prominent, nearly crowded out by the eyes . . Acroricnus p. 33 



127. Scutel distinctly defined, with sutures all around it; hind 



tarsi with their penultimate joints not bilobed; wings rudi- 

 mentary, extending beyond base of propodeum; first ab- 

 dominal segment punctate, not longitudinally wrinkled 



Aptesis p. 328 



Scutel not distinctly defined; face rather rounded 



Gelis p. 327 



128. Propodeal spiracles linear or oval 129 



Propodeal spiracles circular, scutel scarcely or not at all ele- 

 vated, propodeum not produced beyond insertion of hind 

 legs; mandibles bidentate, teeth equal or subequal in length 134 



129. Petiole of abdomen not broader than high 130 



Petiole of abdomen broader than high 133 



130. Abdomen of female acute at tip, last ventral segment re- 



tracted, fourth ventral abdominal segment in male with 



a longitudinal fold *3* 



Abdomen of female obtuse at tip, last ventral segment slightly 

 or not at all retracted, fourth ventral abdominal segment 

 in male without a longitudinal fold 132 



131. Scutel more or less flat, or simply convex, and then grad- 



ually sloping to apex; propodeum rarely bispinose 



Amblyteles p. 344 

 Scutel strongly elevated or hunched, abruptly declivous pos- 

 teriorly; propodeum invariably bispinose .. Hoplismenus p. 343 



132. Scutel flat or simply convex ..Amblyteles (Pterocormus) p. 344 

 Scutel strongly elevated, generally subpyramidal. .Trogus p. 343 



133. Scutel carinate laterally Platylabus p. 342 



Scutel not carinate laterally Eurylabus p. 342 



134. Second dorsal abdominal segment without thyridia at base.. 135 

 Second dorsal abdominal segment with more or less dis- 

 tinct thyridia at base Phaeogenes p. 341 



135. Mandibles of female not emarginate on their inferior margins; 



postscutel without depressions; flagel of male slender at 



base Eparces p. 342 



Mandibles of female emarginate on their inferior margins; 

 flagel of male filiform Colpognathus p. 342 



Ephedrus Haliday. 

 E. incompletus Provancher. 



Length 2.5 mm. ; black ; legs and abdomen more or less stra- 

 mineous. Parasitic on Myzus cerasi, Macrosiphutn rosce and 



Nectarophora rudbeckice. 



