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 luteous 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.; width 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 Stili- 

 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 special 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 : — 



