296 Coleopterological Notices, V. 



slender, very feebly iiicrassate, barely as long as the head and prothorax, the 

 second joint subequal in length to the first and one-third longer than the 

 third, the latter nearly as long as the next two, four to six slightly increasing 

 in width, six to ten subequal, slightly transverse, eleventh acutely ogival, 

 fully as long as the two preceding. Piothorax rather large, subconical, the 

 base loosely fitted over the base of the elytra, three-fifths wider than long ; 

 sides distinctly convergent and very feebly arcuate from the rather broadly 

 rounded basal angles to the apex ; base broadly arcuate, much wider than 

 the apex ; disk broadly and extremely obsoletely impressed along the median 

 line in about basal half. Elytra transverse, at base distinctly narrower, at 

 apex barely as wide as, the elytra, distinctly shorter than the latter ; sides 

 divergent and nearly straight from base to apex ; humeri completely con- 

 cealed ; disk with a small impression behind the scutellum. Abdomen one- 

 half longer than the anterior parts, at base scarcely at all narrower than the 

 elytra, at the apex of the fifth segment three-fourths as wide as the latter ; 

 sides almost straight ; border rather thick and deep ; fifth segment much 

 longer than the fourth. Legs moderate ; posterior tarsi scarcely at all shorter 

 than the tibise, with the first joint almost as long as the entire remainder ; 

 two to four short and equal. Length 2.9 mm. ; width 0.7 mm. 



British Columbia (Glenora). Mr. Wickham 



The extremely elongate basal joint of the hind tarsi and large 

 conical loosely fitted prothorax, will readily lead to the identifica- 

 tion of this species, which may possibly be referred to the subgenus 

 Sphenoma. 



O. nigriceps. — Slender, subfusiform, convex, the head and antennae 

 black, the latter pale toward base ; pronotum pale flavo-testaceous thoughout ; 

 elytra much darker, piceous ; abdomen with the two basal segments dark 

 rufo-testaceous, the remainder black, with the apices narrowly paler ; integu- 

 ments moderately shining, the head polished, rather coarsely, not very densely 

 punctate ; pronotum more finely, very densely, the elytra more distinctly but 

 finely, subasperately and extremely densely, the abdomen minutely densely 

 subasperately and less distinctly ; pubescence fine, extremely short, rather 

 dense but inconspicuous, the abdomen bristling with long setse toward tip. 

 Head slightly wider than long, scarcely three-fifths as wide as the prothorax, 

 evenly, strongly convex, the eyes moderate, at about their own length from 

 the base ; antennae short, rather slender, feebly, gradually incrassate and 

 rather compact, not more than one-lialf longer than the head, the first two 

 joints subequal in length, the second distinctly longer than the third, fourth 

 to tenth feebly, gradually increasing in width, the latter nearly twice as wide 

 as long, eleventh short, obtusely ogival, about as long as the two preceding. 

 Prothorax large, rather more than one-half wider than long, the sides strongly 

 convergent and feebly arcuate from base to apex ; base broadly arcuate, much 

 wider than the apex, the basal angles obtuse and rather broadly rounded ; 

 disk with an extremely obsolete impression in the middle before the base. 

 Elytra distinctly shorter than the prothorax, and, throughout the length, 



