18G THE CANADIAN ENTOMOLOGIST. 



Hind tibisB in 9 smooth or nearly; ocelli triangularly arranged ; 

 mandibles 4 dentate; maxillse at base with two long divergent 

 brushes of pale hairs ; claws with a median tooth 



beneath (2) Dipogon, Fox. 



(Type D. populator, Fox.) 



Wings much abbreviated, not extending to tip of abdomen ; 



second cubital cell smaller than the third ; submedian cell 



longer than the median ; cubitus in hind wings originating 



beyond the transverse median nervure ; claws with one tooth 



beneath (3) Sphictostethus, Kohl. 



(Type P. Gravesii, Hal.) 



3. Submedian cell in front wings not longer than the median or clearly 



shorter, the transverse median nervure interstitial with the basal 



nervure, or uniting with the median vein before the origin of 



the basal nervure 9. 



Submedian cell in front wings distinctly longer than the median, 

 the transverse median nervure uniting with the median vein 

 beyond the origin of the basal nervure. 



Marginal cell pointed at apex; claws 7iot cleft, but with one 

 tooth beneath; inner angle of first discoidal cell without 



a glabrous spot at base, or only faintly indicated 7_ 



Marginal cell broadly rounded, or squarely or obliquely trun- 

 cate at apex; inner angle of first discoidal cell with a 



distinct glabrous spot at base (rarely wanting) 4. 



4 All claws cleft, or with one or more teeth beneath 5. 



Front claws alone cleft, the others with a tooth 



beneath (4) Heteronyx, Sauss. 



5. Marginal cell scarcely thrice as long as wide, the first recurrent 

 nervure received by the second cubital cell beyond the middle or 

 towards apex, but considerably before the second transverse 



cubitus ; claws cleft 6. 



Marginal cell very long, four times, or nearly, longer than wide ; 

 first recurrent nervure interstitial, or very nearly, with the second 

 transverse cubitus ; inner angle of first discoidal cell usually with 

 a glabrous spot ; cubitus in hind wings originating before the 

 transverse median nervure (rarely interstitial). 



Claws with one tooth beneath ; outer ridge on hind tibiae in $ 

 distinctly serrate, the face with short, stiff 



bristles (5) Mygnimia, Shuckard. 



"^ (Type M. flava, Fabr.) 



