Coleopterological Notices, V. 389 



joint barely as long or wide as the preceding two, basal joint slender, feebly- 

 constricted toward apex. Prothorax twice as wide as long, the sides broadly, 

 evenly arcuate from apex to base, parallel nearly to the middle, then conver- 

 gent to the basal angles which are obtuse and scarcely evident ; base broadly 

 arcuate ; apex truncate, the sinuations distant and very feeble ; disk strongly 

 trisnlcate, broadly impressed toward the sides, strongly but not densely 

 punctate throughout. Elytra as wide as the prothorax and distinctly longer ; 

 sides almost parallel ; humeri feebly exposed ; disk strongly, evenly, not 

 densely punctate throughout, the punctures tending to unite longitudinally. 

 Abdomen a little narrower than the elytra ; sides parallel and slightly arcuate ; 

 punctures minute, rather numerous toward base, very remote and obsolete 

 toward apex. Length 3.6-4.0 mm. ; width 1.1-1.2 mm. 



California (Lake Taiioe). 



This species is allied Xo fui^cipennis, differing in the more strongly 

 and less sparsely punctured integuments, dark elytra and legs, 

 rounded sides of the prothorax with nearly obsolete basal angles, 

 and in the male sexual characters. The sixth ventral plate is not 

 modified, the seventh abruptly produced in the middle in a very 

 short gradually narrowed ligula, much wider than long, with the 

 apex feebly sinuato-truncate, the angles rounded, its surface tumid 

 and widely beveled toward apex, the surface of the segment with 

 two approximate subconfluent setigerous tubercles at some distance 

 anterior to the base of the ligula, and distant by less than the apical 

 width of the latter. 



O. illTeilllstus n. sp. — Stout, black, highly polished and glabrous, the 

 elytra dark piceous ; legs and basal joint of the antennae pale ; sparse erect 

 set^e long and distinct. Head small, wider than long, distinctly narrower 

 than the prothorax, deeply concave at apex, the median parts of the clypeus 

 flat, with the apical margin broadly sinuate and biangulate ; punctures strong 

 but sparse ; ej'es moderate, convex ; tempora strongly, evenly arcuate to the 

 neck, but slightly longer than the eye and not more prominent ; antennae one- 

 half longer than the head, strongly incrassate, the first joint long, slightly 

 contorted and broadly constricted near the apex ; tenth scarcely one-third 

 wider than long, eleventh small, not as long as the two preceding. Pt-othorax 

 not twice as wide as long, widest at the middle, the sides parallel, evenly, 

 broadly arcuate throughout ; base and apex very nearly equal ; basal angles 

 broadly obtuse but not blunt; disk strongly trisulcate, broadly and strongly 

 impressed sublaterally, strongly but rather sparsely punctate, the punctures 

 line on the median ridges. Elytra distinctly longer tlian the prothorax, at 

 base equal in width, at apex a little wider ; disk strongly but rather sparsely, 

 nearly evenly punctate. Abdomen distinctly narrower than the elytra ; sides 

 parallel, feebly arcuate toward apex ; surface subimpunctate ; border rather 

 deep, moderately thin. Length 3.7 mm. ; width 1.1 mm. 



