232 Trans. Acad. Sci. of St. Louis. 
| 
, These genera differ greatly in the general facies of the 
body, in the antennae, sculpture and form of the prothorax 
but are closely related otherwise. 
Stilicopsis Sachse. 
The peculiar form of the prothorax, almost exactly circular 
in outline, short elytra with diverging sides and broad convex 
abdomen, will identify this remarkable genus at first glance. 
Our single species may be briefly described as follows: — 
Form parallel, moderately convex, pale lutecus in color throughout, slightly 
shining, subglabrous; head scarcely as long as wide, the eyes convex, 
prominent, coarsely faceted and at somewhat more than their own 
length from the base measured longitudinally, the sides circularly 
rounded behind them to the neck; antennae distinctly shorter than the 
head and prothorax, the latter feebly convex, densely granulose 
throughout, the surface impressed at the sides behind the middle, equal 
in width to the head; elytra transverse, not quite as long as the pro- 
thorax, at apex distinctly wider, coarsely, closely, rugosely punctate; 
abdomen at the middle wider than the elytra, finely, closely and ru- 
gosely punctate, shining. Male with the fifth ventral broadly, paraboli- 
cally emarginate throughout its width, the sixth similarly emarginate 
but more strongly; cleft of the seventh broad, the ligula parallel, 
arcuato-truncate at tip; segmental surfaces not modified. Length 2.6 
mm.; widih 0.58 mm. North Carolina (Asheville) and Florida. 
paradoxa Sachse 
The median line of the pronotum is very finely elevated or 
cariniform. Other species occur in Mexico and the neotropical 
regions. 
Stamnoderus Shp. 
The species of this genus are at least three in number in our 
Atlantic states and may be readily distinguished from S¢ili- 
copsis paradoxa by the larger size and the peculiar form of 
the prothorax. The antennae are of unique structure, the 
singular swelling of the anterior side of the long and extremely 
slender joints toward tip being doubtless of a sueoal sensorial 
nature. Individuals are not at all rare and the species repre- 
sented by material before me may be distinguished by the 
following characters — drawn from the female in each case : — 
