118 THE CANADIAN ENTOMOLOGIST. 



3. Bristles on the veins no longer than those on the membrane, 



or barely so; membrane not granulate; median part of 

 mesonotum with some bristle-bearing granules; the prono- 

 tum rather large; hind wings much excised on outer margin. 4 



Bristles on the veins noticeably longer than those on the mem- 

 brane; median part of the mesonotum without bristle- 

 bearing granules; hind wings scarcely excised on outer 

 margin 5 



4. Outer margin of fore wings sinuately emarginate; vertex 



without distinct posterior warts Glyphotcelius. 



Outer margin of fore wings not emarginate; posterior warts 



distinct Arctcecia. 



-5 In hind wings a cross-vein between the subcosta and radius 

 near tip; \ertex conxex, smooth, posterior warts 



reduced Astenophylax. 



No such cross-vein in the hind wings, vertex flat; posterior 



warts well developed 6 



"(3. Vertex, part of thorax, and fore wings with dense appressed 

 hair; basal cross- veins very weak; fore wings not granulate, 



with a median silvery stripe Ilesperophylax, n. gen. 



(Platyphylax occidentalis Bks.) 



\'ertex not with dense appressed hair 7 



'7 . Spurs 1. 2, 2, in hind wings the discal cell does not reach before 

 the median fork; fore wing roughened .4 //c.{,'o/)/fv/a.x', n. gen. 



(Platyphylax suhfasciata Say). 



Spurs 1, 3, 3, or 1. .3. 4 8 



■8. Spurs 1, 3, 4 9 



Spurs 1, 3, 3 11 



t). In the hind wings the discal cell reaches plainly before the 



forking of the median vein 10 



In the hind wings the discal cell not before the forking of 

 median vein; meml)rane of fore wings 



roughened Eiistenace, n. gen. 



(Stenophylax limbatus McL.) 

 10. Large species; wings very broad; in fore wings the front side 



of discal cell is slightly concave Slenophylax. 



Smaller species: elongate wings; in fore wings the front side 

 of discal cell is nearly straight.. Rhadicoleptus. 



