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 Hustilicus is assumed, as no mention of them is made by 
Dr. Sharp. It is rather singular that the completely different 
labrum of Séilicus rufipes 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. .cececcecccccccrveecccssecs 2 
Under surface of the head sparsely punctured ......csecesccccerececcccee 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, 
