Coleopterological Notices, V. 299 



very strongly transverse, eleventh short, not longer than wide, obtusely and 

 obliquely ogival, scarcely as long as the two preceding, outer joints with short 

 erect setae in addition to the minute pubescence. Prothorax three-fifths wider 

 than long ; sides distinctly convergent, evenly and rather strongly arcuate 

 from base to apex ; base broadly, strongly arcuate, much wider than the trun- 

 cate apex ; basal angles obtuse, blunt but very evident ; disk strongly, evenly 

 convex, without impressions. Elytra throughout equal in width to the pro- 

 thorax, distinctly longer, nearly quadrate ; sides subparallel, almost straight; 

 humeri not exposed. Abdomen about as long as the anterior parts, at base 

 almost as wide as the elytra ; sides feebly convergent from base to apex and 

 just visibly arcuate ; fifth segment but slightly longer than the fourth ; under 

 surface sparsely, deeply and coarsely punctate and sparsely clothed with long 

 coarse hairs. Length 2.3 mm. ; width 0.7 mm. 



California (Humboldt Co.). 



Differs from the preceding species in the gradually wider and 

 sparsely setose outer joints of the antennae, and in the structure of 

 the basal joints. A single specimen of undetermined sex, 



O. californica. — Somewhat fusiform, convex, highly polished through- 

 out, black, the elytra piceous, testaceous at the humeri and along the suture 

 near the apex ; abdominal tip scarcely at all paler ; legs pale ; antennae black, 

 pale toward base ; head and pronotum minutely feebly and sparsely punctate, 

 the elytra finely but a little more strongly and still more sparsely so ; abdomen 

 finely, scarcely distinctly and sparsely; pubescence somewhat long, subrecum- 

 bent, coarse and sparse. Head orbicular, as long as wide, evenly convex, 

 nearly three-fourths as wide as the prothorax, the eyes at less than their 

 length from the base ; antennae fully as long as the head and prothorax, stout, 

 feebly setulose and finely pubescent, the first joint small, elongate-oval, longer 

 than the second, the latter twice as long as wide and distinctly longer than 

 the third, fourth and fifth very short and transverse, increasing in width, 

 sixth to tenth subequal in length and width, longer than either the fourth or 

 fifth and not more than twice as wide as long, eleventh short, obtusely and 

 obliquely ogival, about as long as the two preceding. Prothorax rather small, 

 three-fourths wider than long, the sides convergent and arcuate from the 

 broadly rounded and almost obsolete basal angles ; base and apex broadly 

 arcuate, the former much the wider ; disk evenly, strongly convex, unim- 

 pressed, the basal bead strong. Elytra large, but slightly wider than long, 

 one-fourth wider and rather more than one-half longer than the prothorax ; 

 sides subparallel ; humeri quite distinctly exposed, rounded ; disk strongly 

 and widely impressed on the suture in more than basal half. Abdomen as long 

 as the anterior parts, at base much narrower than the elytra, and, at the fifth 

 segment, one-half as wide as the latter ; sides feebly convergent from base to 

 apex and just visibly arcuate ; fifth segment distinctly longer than the fourth. 

 Legs rather long, very slender ; femora unusually narrow ; hind tarsi two- 

 thirds as long as the tibiae, with the first joint longer than the next two but 

 shorter than the fifth. Length 1.9 mm. ; width 0.7 mm. 



