220 Trans. Acad. Sci. of St. Louis. 



seemed as though the genus named Omostilicus in the table 

 might be identical, but the statements concerning the absence 

 of thoracic angles and carination of the prosternum evidently 

 render highly improbable any close affiliation of the two 

 genera. The presence of two minute external labral denticles 

 in Eustilicus is assumed, as no mention of them is nntde by 

 Dr. Sharp. It is rather singular that the completely different 

 labrum of /Stilicus rujipes Germ., taken in connection with its 

 very pronounced divergence in general habitus, should not 

 have been more fully dwelt upon by European authors. The 

 differences are of full generic significance and the name 

 Stilicosoma (n. gen.) is suggested for it as above. 



Stilicus Latr. 



The American species of this genus are all much smaller 

 than the European and have far simpler secondary male sexual 

 characters, but appear to be truly congeneric. They occur 

 throughout the United States from the Atlantic to the 

 Pacific and are generally rather abundant individually. 

 There are usually several species possessing secondary male 

 sexual characters of the same type, though variously modified, 

 and they might be classified in this manner, but, owing to the 

 fact that a very few distinct forms are at present represented 

 by the female alone, I prefer to attempt an arrangement based 

 upon general characters, presumably common to the sexes, as 

 follows : — 



Under surface of the head densely punctured 2 



Under surface of the head sparsely punctured 6 



2 — Sculpture finer, the punctures dense even on the elytra. Form rather 

 broad and subdepressed, rufo-piceous in color, the abdomen blackish, 

 the elytra dusky with the external angles broadly pale, the legs and an- 

 tennae rufo-testaceous; head well developed, subquadrate, truncate 

 at base with broadly rounded angles, the sides parallel; eyes large, 

 broadly convex, at about one-half more than their own length from the 

 base; antennae rather slender, feebly incrassate, scarcely a third longer 

 than the head; surface confluently punctate above, the punctures 

 shallower and polygonally crowded beneath; prothorax rather broad, 

 slightly longer than wide, nearly three-fourths as wide as the head, 

 obtusely angulate at the sides at apical third, the angles well rounded, 



