226 Trans. Acad. Sci. of St. Louis. 
length from the base; prothorax relatively larger, but otherwise similar 
in form; elytra subquadrate, rather shorter than wide, parallel, dis- 
tinctly narrower than the head, not distinctly longer than the prothorax 
and only about two-fifths wider; abdomen near the middle fully as 
wide as the elytra. Male with sexual characters somewhat resembling 
those of luculentus, the broad sinuosity of the fifth ventral still more 
shallow, with the process at its middle point almost obsolete, being 
reduced to avery small, short and broadly rounded lobe; sixth seg- 
ment more broadly impressed along the middle, with the apical sinus 
scarcely twice as wide as deep and very broadly parabolic in form, 
being much less narrowly rounded at the bottom. Length 3.5 mm.; 
width 0.7 mm. Rhode Island (Boston Neck)........minuseulus n. sp. 
The species named minusculus above seems to differ from 
any other in having the elytra obliquely and obscurely uni- 
or bi-costulate on the disk. The characters of occiduus are 
those given by Mr. Fall in the original description (Occas. 
Papers, Cal. Acad., viii). The species of the table consti- 
tuting distinct types are opaculus, latiusculus, rudis, biarma- 
tus, dentatus and angularis; the form named abbreviellus, 
although a well defined species, evidently belongs to the 
biarmatus section and the last three species of the table are 
distinct modifications of the dentatus type. The rudis 
type is distinguished by its much smaller eyes, these being of 
about the same size as in the European Stilicus capitalis. 
The Japanese species of the rufescens type, resemble opaculus 
and are distinguished from the others by an obviously less 
coarse and denser sculpture, subquadrate head truncate at 
base and by the presence of a few irregular longitudinal series 
of coarser punctures on the elytra, a character not observable 
elsewhere. 
Pachystilicus n. gen. 
The species of this genus are few in number but distrib- 
uted over the entire nearctic province from the Atlantic to 
the Pacific. They are closely allied to Stilicus but differ in 
the very short and broad form, finer punctuation and much 
shorter and thickened legs; these characters, in addition to 
the large quadrate head, deeply sinuate at base, give them a 
distinctly different facies. The evidence at present acces- 
sible to me seems to indicate two species as follows :— 
