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 moie 

 shallow, with the process at its middle point almost obsolete, being 

 reduced to a very 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 aud very broadly parabolic in form, 

 beiDg much less narrowly rounded at the bottom. Length 3.5 mm.; 

 width 0.7 mm. Rhode Island (Boston Neck). ....... milinsculas 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 t}-pes are opaculus, Jatiusculus, 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 : — 



