630 Coleojyterological Notices, VI. 



the two sexes of one species. I find, liowever, that the spotted 

 vestiture is a constant asexual character in other species, or at 

 least is not at all characteristic of the female, and, besides this, 

 these two specimens differ structurall}- to a considerable degree, 

 the entire form of the body being different; finally, the deep me- 

 dian sulcus o{ impressicoUia exists only as a vestige in indutus. 



S. subalbicaiis. — Narrow, convex, the elj'tra polished, the histre but 

 little concealed by the scanty cinereous vestiture, except in the dense and 

 widely scattered spots; color of body and antennae black throughout, the 

 femora black, rufescent at base; tibise rufous, the apex black; tarsi black, the 

 basal joint feebly rufescent except toward apex. Head but slightly wider than 

 long, relatively coarsely, very deeply and denselj' rugoso-punctate ])ut not dull, 

 the vestiture rather short and only moderately dense; eyes separated by a little 

 more than twice their ^^•idtll, the tempora equally prominent and al)out one- 

 half as long; antenna; rather stout, filiform, distinctly less than one-half as long 

 as the body. Prothorax barelj' as long as wide, with outline nearly as in the 

 preceding species, sculptured almost like the head, the median sulcus strong, 

 impressed; lateral impressions very feeble; surface unusually convex. Elytra 

 evidently less than twice as wide as the prothorax and distinctly more than 

 twice as long as wide, the sides parallel, parabolic in apical fourth, scarcely at 

 all deliiscent on the suture even at the extreme apex; humeri broadly rounded 

 to the prothorax; punctures coarse, deep and close, the sculpture rugulose by 

 anteriorly oblique light; interspaces not appreciably punctate. Abtlomen 

 closely punctate 1)iit unusually shining, the punctures smaller and more super- 

 ficial. Legs rather long. Length 5.5 mm.; width 1.5 mm. 



California (San Francisco). Mr. Dunn. 



The smallest species of the genus and quite distinct from any 

 other, differing from impressicoUis in the feeble pronotal impres- 

 sions and color of the legs, and from (juftafus in its much smaller 

 size and more slender form. The single specimen is a male. 



PER<wETrS n. gen. 



This genus is founded upon Earipjenius campanulatiis of Le- 

 Conte, which occurs in the Island of Vancouver. As a genus it is 

 remarkably distinct from Retocomus in the structure and vesti- 

 ture of the legs, in the comparatively small, uneinarginate eyes 

 and much more developed maxillary j)ali)i. The i)ronotum is 

 deeply and peculiarly sulcate along the middle ; the sexual charac- 

 tei's affecting the fifth segment of the abdomen are feeble, and the 

 tibial spurs are long, all of which characters are foreign to Reto- 

 comus. The tibia? are cylindrical, and are clothed with short stiff 

 inclined pubescence, very uniformly throughout, while in Reto- 



