232 The Ohio Naturalist. [Vol. II, No. 6. 



oil definite structural characters. These characters seem to be of 

 sufficient value to warrant subgeneric separation at least, and per- 

 haps upon a comparative study of the related genera some of these 

 groups may be found worthy of generic rank. 



Under each species is given the reference to its original descrip- 

 tion and the original reference to any synonyms that have been 

 published and references to any descriptive article published since 

 the Van Duzee Catalog. The bibliography in that Catalog is so 

 complete and accurate that it has not seemed necessar^^ to repeat 

 it here except in one or two cases where the synonomy has been 

 changed. 



A'ey to the Subgenera. 



A. Vertex transverse, much wider than long, margins parallel or the ante- 

 rior but slightly in advance of the eyes. Anterior margin in profile 

 obtusely rounding to front, Subg. AtJiysanns Burm. 



AA. Vertex not distinctly transverse, usual!}' produced before the e3es. 

 Anterior margin in profile meeting front in an angle or conically 

 produced point. 

 B. Vertex distinctl}' wider than its middle length, much wider than 

 the long diameter of an eye. 

 C. Vertex and front obtu.sely, conically pointed ; vertex con- 

 vex between the eyes; front somewhat inflated ; markings 

 on vertex in the form of transverse lines or absent. 



Subg. Conosanus nov. 

 CC. Vertex and front angled ; the vertex flat with a definite 

 margin ; front very flat in both diameters. Anterior mar- 

 gin of vertex with four definite black spots or with two 

 which extend below the margin onto front, 



Subg. Coiinnellus nov. 

 BB. Vertex narrow, its basal width rarely equal to its middle length, 

 often narrower than the long diameter of an eye. Species 

 small. Subg. Stirellus nov. 



SUBGENUS ATHYSANUS BURM. 



Head broad and short, the vertex much wider than long, mar- 

 gins parallel or nearly so, rounding to front without a definite 

 margin, front broad, the face very deep, but little inclined. Ely- 

 tra usually rather long, compressed behind and giving a wedge- 

 shaped appearance to the in.sect. Venation definite, simple, but 

 one cross nervure between the sectors, the anteapical cells usually 

 parallel-margined . 



Type A. argentatus Fab. ( European ) which closely resembles 



viagmis O. B. 



Key to tlic Subgenus. 



A. Size very large, width over 2% mm.; front narrowing regularly into 



clypeus without an angle, inagnus Osb. and Ball. 



AA. Size .smaller, less than 2 mm. in width, apex of front distinctly wider 

 than clypeus, often twice as wide. 

 B. Ground color white or ])ale straw, at least no greenish tinge, 

 anterior margin of vertex with black spots. 

 C. Short and .stout, elytra short, nervures light, apical cells 

 .short ; female ovipositor no longer than pygofers, 



frig id us Ball. 



