86 THE CANADIAN ENTOMOLOGIST. 



Third cubital cell in front wings triangular or subtriangular, smaller 

 than the second and sometimes petiolate 27. 



27. Body wholly black, but more or less distinctly clothed with a silvery 



or sericeous pubescence ; first and second joints of flagellum in 

 both sexes equal or very nearly. . .(22) Anoplius, Lepel. (Dufour). 



(Type Pompilus nigerrimus, Scopoli.) 

 Body not wholly black and not clothed with a silvery pubescence, the 

 abdomen smooth, shining, always red at base; first joint of flagellum 

 in 9 longer than the second, in ^ about 



equal (24) Arochnophila, Ashm., g. nov. 



(Type Pompilus divisus, Cress.) 



28. Body wholly black, usually more or less clothed with a silvery 



pubescence ; first joint of flagellum in <j> longer than the second, 

 in o* not longer that the second. .(23) Aporoideus, Ashm., g. nov. 



(Type Pompilus sericeus, V. de Lind.) 



29. Pronotum with the hind margin obtusely angularly emarginate ; first 



joint of flagellum in 9 always longer than the second, in £ some- 

 times shorter 31. 



Pronotum with the hind margin arcuately emarginate 30. 



30. Body in ^ usually clothed with a silvery pubescence ; third cubital 



cell triangular, usually petiolate, especially in 



males (19) Pompilinus, Ashm. 



(Type Pompilus cylindricus, Cress.) 



31. Body black and usually with a more or less distinct silvery 



pubescence, especially in males ; abdomen black, immaculate ; 

 third cubital cell triangular and often petiolate or subpetio- 



late (22) Anoplius, Lepel. (Dufour.) 



(Type Pompilus nigerrimus, Scopoli.) 



Head and thorax usually black, but without a silvery pubescence, the 



abdomen smooth and shining, always red basally ; third cubital cell 



variable, sometimes triangular and 



petiolate (24) Arachnophila, Ashm., g. nov. 



32. Pronotum with the hind margin obtusely angularly emarginate . . t,$. 

 Pronotum with the hind margin arcuately emarginate. 



33. Submedian cell in front wings a little longer than the median ; third 



cubital cell trapezoidal or narrowed above, never distinctly triangular 

 or petiolate ; mandibles in $ 3-dentate, in g 2-dentate. 



