AMERICAN COLEOPTERA. 73 



Descrptioiis of New Species of COIiEOPTERA from the 

 Pacifie Coast of the United States. 



BY Q. R. CROTCH, M. A. CANTAB. 



[The descriptions here published were the last prepared by Mr. 

 Crotch, and were intended to make a companion paper to those by 

 Dr. Horn and myself. Many species which he desired to describe, 

 belonging to families to which he had given special attention, re- 

 main undetermined, the rapid progress of the pulmonary phthisis 

 which caused his death, having rendered all scientific labor impossible. 

 I have, by the kind permission of Mr. W. D. Crotch, retained a series 

 of the unnamed forms, which will be investigated fully at a future 

 time. — Leg.] 



Oimis sequoiaruni, n. sp.— Closely allied to 0. californicus, but rather 

 longer and markedly broader and stouter; the labrum is produced in front, 

 instead of being transverse or at most convex; the antenna are clearly thicker 

 and shorter; the thorax is broader and shorter and less constricted at the base, 

 the sides are more rounded, the disc is much less wrinkled, without being as 

 smooth as iu O.Audouini; the elytra are also broader and more convex. L. 

 17.5 mm. 



Very distinct by the form of the thorax, which is so broad that the 

 side pieces are not visible from above, as is the case in the other 

 species. Found at present only at Calaveras in the Sierra Nevada, 

 originally by Mr. Edwards, and afterwards by myself, in June, 1873.' 

 I have seen in all 20 specimens precisely similar. 



O. E:lwar€lsii, n. sp.— Again allied to 0. californicus, but longer, and a 

 generally larger insect; the antennae are much stouter (being in fact thicker 

 than in any other species), the labrum is convex in front, head broad, super- 

 ciliary ridge obsolete; thorax as broad in front as it is long, sides straight, ob- 

 lique, much narrowed towards the base, disc feebly wrinkled as in O.'sequoia- 

 rum; elytra with the sides yiore parallel and less ventricose. L. 17.5^18 mm. 

 This is a larger and stronger insect than the' others, with thick an- 

 tennse, heavy femora and longer tarsi. All the known specimens (6 

 in number) come from Lake Tahoe where it was first found by Mr. 

 Henry Edwards, and again by myself I have great pleasure in dedi- 

 cating this species to its original captor, who had already detected the 

 distinctness both of this and the preceding species. 



Hydroporus (Coclambus) ungnicniaris, n. sp.— Elongate ovate, 

 fulvous, breast and abdomen black; head finely punctulate with smooth spaces; 

 thorax transverse, sides slightly rounded, punctulate, disc nearly smooth, with 

 a small black central mark and a linear fovea, base and apex faintly black; 

 elytra regularly elongate-ovate, closely and finely punctate throughout, each 



TRANS. AMER. ENT. SOC. (10) jULy 1874, 



