232 
The Ohio Naturalist. 
[Vol. II, No. 6. 
on 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 necessaiy to repeat 
it here except in one or two cases where the synonomy has been 
changed. 
Key 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. Athysanus Burm. 
AA. Vertex not distinctly transverse, usually produced before the eyes. 
Anterior margin in profile meeting front in an angle or conically 
produced point. 
B. Vertex distinctly wider than its middle length, much wider than 
the long diameter of an eye. 
C. Vertex and front obtusely, 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. Commellus 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 insect. Venation definite, simple, but 
one cross nervure between the sectors, the anteapical cells usually 
parallel-margined . 
Type A. argentatzis Fab. (European ) which closely resembles 
magnus O. B. 
Key to the Subgenus. 
A. Size very large, width over 2'/ z mm.; front narrowing regularly into 
clypeus without an angle, magnus 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 pale 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, 
frigidus Ball. 
