lljft THE CANADIAN ENTOMOLOGIST. 



Eyes bare ; mandibles not bituberciilate within ; scutellum not 

 bifoveolate at base ; recurrent nervure received by the first 

 cubital cell beyond its middle ; anal lobe in hind wing not 

 extending beyond the submedian cell ; mesosternum with a 



strong ridge before the middle coxk Encopognathus, Kohl. 



[Type E. Braueri, Kohl.] 



2. Recurrent nervure received by the first cubital cell at or near its 



middle ; transverse cubitus joining the marginal cell a little before 



its middle ; anal lobe in hind wings extending beyond the short 



submedian cell Lindenius, Lepeletier et Br. 



[Type L. argentatus, Lep. et Br.] 



North American Species. 



(2) Emtomognathu's, Dahlb. 



(1) E. texanus, Cr. 



(5) EXCOPOGNATHUS, Kohl. 



None. 

 (4) Lindenius, Lepel. et Br. 

 (i) L. errans, Fox. 



(2) L. latifrons, Fox. 



(3) I^. armaticeps, Fox. 



(4) E. fiaviclypeus, Fox. 



(5) E. pinguis, Fox. 



(6) L. salicis, Ckll. (Ammoplanus). 



Subfamily III. — Crabroninre. 



This group is probably the most extensive one in the family, the 

 species, as a rule, being larger and more gaily coloured than those of the 

 other groups. 



The subfamily is readily separated from the others by the very dis- 

 tinct ridge, crest or carina on the mesopleura just before the middle 

 coxa?, a character first pointed out, I think, by Dr. Kohl, and by the 

 first recurrent nervure entering the first cubital cell near its apex, or at 

 its apical fourth or fifth. 



Table of Genera. 



Males : mandibles at apex always bidentate to. 



Females : 

 Mandibles at apex bidentate, rarely truncate and indistinctly biden- 

 tate ; pygidium in $ triangular, above flat, never deeply qxch- 



