394 Coleopterological Notices, V. 



gulate, the eighth not distinctly impressed. The mentum is nearly 

 as in placusinus, but with a deeper, more even, feebly arcuate and 

 unusualy coarse subbasal groove. Numerous specimens. 



O. alpicola n. sp. (Fauvel MS.) — Broad, flat above, dull, very densely 

 sculptured, black througliout, the antennse slightly paler toward base ; legs 

 dark rnfo-testaceous ; integuments deeply, densely but not very coarsely 

 punctate, the punctures separated by longitudinally anastomosing rugse 

 throughout, the small depressed clypeus between the antennal prominences 

 more feebly sculptured and somewhat shining ; abdomen coarsely, strongly 

 reticulate and dull, feebly, sparsely punctate and sparsely clothed with short 

 hairs, which are more distinct but not at all closer on the polished under sur- 

 face. Head subquadrate, nearly as long as wide, quite distinctly narrower 

 than the prothorax, longitudinally trisulcate, the median impression narrow 

 and distinct, the lateral broad and feebler ; eyes small, at fully one-half more 

 than their own length from the basal angles ; tempora divergent and nearly 

 straight behind them, broadly rounded behind, becoming transverse near the 

 neck, which is narrow, only three-fifths as wide as the head ; antennae gradu- 

 ally, moderately incrassate, scarcely one-half longer than the head, the basal 

 joint as long as the next three, second longer and thicker than the third, 

 tenth one-half wider than long, eleventh fully as wide but not quite as long 

 as the preceding two, obtusely ogival. Prothorax about twice as wide as long, 

 the sides parallel and feebly arcuate, becoming strongly convergent in basal 

 half, the basal angles very obtuse, almost obliterated ; disk trisulcate, the 

 median sulcus distinct and entire, the lateral partial and broadly impressed, 

 scarcely at all impressed toward the sides. Elytra equal in width to the 

 prothorax and nearly one-half longer, one-third wider than long ; sides 

 subparallel, feebly arcuate ; humeri slightly exposed ; disk flat, not at all 

 impressed at the suture near the base. Abdomen subequal in width to the 

 elytra. Length 2.1 mm. ; width 0.7 mm. 



Colorado. 



The male is the only sex examined ; it has very feeble abdominal 

 characters, the seventh ventral plate being transversely truncate 

 throughout its width, shorter than the dorsal plate, the infolded 

 sides of which are visible laterally beyond its apex. The mentum 

 has no groove, but a depressed basal area, extending beyond the 

 middle and ^bounded anteriorly by an arcuate line from angle to 

 angle, which is. evenly, transversely rugose; anterior part polished, 

 devoid of sculpture; apical membranous margin fine. 



O. IlitiduillS Grrav, — Micr., p. 107; punctatus Lee: Tr. Am. Ent. Soc, 

 VI, p. 236 ; rugulosus Gemm. et Har. nee Say. 



Elongate, slender, parallel and rather depressed, shining, strongly 

 but not densely punctate, black, the legs pale; elytra rufo-testaceous, 



