THE CANADIAN ENTOMOLOGIST. 85 



20. Third cubital cell trapezoidal or, at most, subtriangular, never dis- 



tinctly triangular or petiolate ; abdomen black 21. 



Third cubital cell triangular and petiolate or subpetiolate, especially 

 in the males ; abdomen more or less red basally 22. 



21. Pronotum hardly shorter than the mesonotum, the hind margin 



arcuately emarginate ; first joint of flagellum in 9 longer than 

 the second, in <-? not longer than the second ; tarsal comb not 



long (19) Pompilinus, Ashm., g. no v. 



(Type Pompilus cylindricus, Cress.) 



Pronotum shorter than the mesonotum, the hind margin obtusely 



angularly emarginate ; first joint of flagellum in $ very elongate, 



longer than the second, in ^ about equal to the second ; tarsal 



comb long, flexible (20) Agenioideus, Ashm., g. n. (part). 



(Type Pompilus humilis, Cress.) 



22. Pronotum shorter than the mesonotum, the hind margin obtusely 



angularly emarginate ; first joint of flagellum in 9 elongate, very 

 distinctly longer than the second, in rf not or scarcely longer than 

 the second ; abdomen usually marked with red or yellowish on basal 



segments (21) Entypus Dahlbom. 



(Type E. ochraceus, Dahlb ) 



23. Metathorax posteriorly rounded, neither impressed nor obliquely 



truncate, and usually without a distinct median longitudinal 

 impressed line or furrow above, the latter, if present, is very 



vaguely defined; pronotum rarely much lengthened 30. 



Metathorax posteriorly obliquely truncate or impressed, often concave 

 or subconcave posteriorly; if rounded posteriorly, then the meta- 

 notum has a median longitudinal impressed line or furrow 24. 



24. Front tarsi in 9 without a distinct long comb, at most with a scopa 



of short stiff bristles beneath and a few short bristles at apex of the 



joints - 34. 



Front tarsi in J with a distinct, usually long comb ; claws in $ with 

 a median tooth beneath, in £ cleft (rather otherwise and then 

 noted) 25. 



25. Submedian and median cells in front wings equal, the transverse 



median nervure being interstitial with the median nervure . . . . 26. 

 Submedian cell in front wings longer than the median .... 29. 



26. Third cubital cell trapezoidal, usually as large or nearly as the 



second . . 1 . . . = 28. 



