G. C. DAVIS. 271 



Metanotum not areolated ; clypeus not impressed at tip and without elevated 

 margin ^Hybrisles Foer. 



89. Mandibles without teeth ■■Exacrodiis Foer. 



Mandibles toothed "0. 



90. Lower tooth of mandibles longer than upper 91. 



Lower tooth of mandibles as short as upper 92. 



91. Clypeus with a transverse impression at the tip; longer spur of hind tibije 



more than half as long as the heel segment. «TachyportInis Foer. 

 Cl.vpeus without apical impression, anterior margin not elevated ; longer 

 spur of hind tibiie not half as long as heel segment of tarsi. 



• Hyperallus Foer. 



92. Apical segment of hind tarsi as long as the third, or but little shorter. . . .93. 

 Apical segment of hind tarsi shorter than the third 9.5. 



93. Segments 3 and 4 are narrower at apex than base. .f-'-HyperbatiiS Foer. 

 Segments 3 and 4 of equal width at base and apex 94. 



94. Clypeus transversel.v impressed before apex; hind tarsi a little longer than 



the tibiffi f "Scoparolies Foer. 



Clypeus without transverse impression before apex ; hind tarsi are somewhat 

 shorter than tibifB t*t"^'n«pl>«g» Foer. 



95. Base of discoidal cell shorter than transverse median nervure 96. 



Base of discoidal cell as long or longer than transverse median nervure. .97. 



96. Second recurrent nervure starting far back of the cubital ; segment 1 without 



deep longitudinal furrows beside the spiracles-. .f*AlIocritiis Foer. 



Second recurrent nervure and the cubital almost interstitial ; segment 1 with 



a deep longitudinal furrow beside the spiracles- . .t*En«ecetis Foer. 



97. Distance between mandibles and eyes is greater than the basal width of man- 



dibles ; longer spur of hind tibiae scarcely more than a third the length 



of basal member of hind tarsi *Syiiodites Foer. 



Distance between mandibles and eyes is less than the basal width of mandi- 

 bles 98. 



98. Segments 1-3 more or less rugose 99. 



Segments 1-3 not rugose 101. 



99. Segments 1 and 2 with a transverse impression ^ipiKltea Foer. 



Segments without transverse impressions 100. 



100. Humeral cross-nervure broken at the middle ; posterior median area without 



middle carina; clypeus much impressed at apex from both sides; seg- 

 ment 2 without a margin beside thyridia ; dorsal carina disapi)earing 



at base on basal segment *RliiiiotoriiS Foer. 



Humeral cross-nervure broken a little below the middle: posterior median 

 area with a sharp middle carina ; segment 2 has a shortened lateral 

 margin beside the thyridia; sole of hind tarsi quite long and hairy; 

 dorsal carinse of basal segment much elevated -C-ampouastes Foer. 



101. Segment 1 more than twice as broad at apex as at base 102. 



Segment 1 not more than twice as broad at apex as base 103. 



102. Clypeus not flattened from base; second recurrent and cubital nervures 



nearl.v interstitial *TaiitozoIii>* Foer. 



Clypeus much flattened from base *Hypaiiibl.vs Foer. 



103. Clypeus with slight transverse impression before apex ; aj.ical edge with 



elevated margin and covered with a stiff row of bristles. 



PllH^stus Foer. 

 Clypeus without transverse row of bristles on front edge 104. 



TRANS. AM. ENT. SOC. XXIV. SEPTEMBER. 1897. 



