294 Coleopterological Notices, V. 



crassate, tlie first three joints subequal in length, fourth slightly longer than 

 wide, outer joints distinctly transverse, the tenth less so than the ninth, equal 

 in width but a little longer, eleventh short, acutely conoidal, not as long as 

 the preceding two. Prothorax fully three-fourths wider than long ; sides 

 broadly, evenly arcuate and distinctly convergent from base to apex ; base 

 fully three-fourths wider than the apex, broadly, strongly arcuate ; apex 

 subtruncate ; basal angles obtuse and blunt but definite ; disk extremely 

 obsoletely impressed along the median line, with a large rounded and distinct 

 impression in the middle before the base. Elytra slightly transverse, at base 

 exactly equal in width to the prothorax and at apex slightly wider, fully one- 

 third longer ; humeri not exposed ; disk but feebly, indefinitely and broadly 

 impressed in the middle toward base. Abdomen at base distinctly narrower 

 than the elytra, the sides parallel and straight to the apex of the fourth 

 segment ; fifth very much longer than the fourth. Length 2.75 mm. ; width 

 0.75 mm. 



British Columbia (Glenora). Mr. Wickham. 



Readily distinguishable froui congruens by its smaller size, smaller 

 prothorax with more distinct basal angles, shorter antennae, longer 

 fifth ventral segment and many other characters. 



O. nullifer. — Somewhat narrow, subparallel, pale rufo-testaceous, the 

 head piceous ; abdomen piceous, broadly pale at tip and at the apices of all 

 the segments ; legs pale ; antennae dusky, pale toward base ; integuments 

 strongly shining, extremely feebly sculptured ; head and pronotum finely 

 and closely but feebly and not conspicuously punctate, the elytra scarcely so 

 densely but more distinctly so, the abdomen minutely, feebly and moderately 

 densely; pubescence short, decumbent, moderately dense. Head orbicular, 

 evenly convex, as long as wide, a little more than one-half as wide as the 

 prothorax ; eyes at nearly their own length from the base ; antennae short, 

 feebly incrassate, not quite extending to the base of the prothorax, the second 

 joint a little longer than the first and distinctly longer than the third, fourth 

 subquadrate, feebly obconical, five to ten subequal, distinctly wider than 

 long, eleventh long, obtusely ogival, rather longer than the two preceding. 

 Prothorax widest at base, two-thirds wider than long, the sides strongly con- 

 vergent and feebly, evenly arcuate from base to apex ; base and apex equally, 

 moderately arcuate, the former two-thirds wider than the latter ; basal angles 

 — viewed laterally — very obtuse and blunt but not obliterated, the apical 

 moderately defined, broadly rounded ; disk perfectly even, without trace of 

 impression. Elytra at base scarcely as wide, but at apex fully as wide, as the 

 prothorax, just visibly longer, slightly transverse ; sides subparallel ; humeri 

 concealed ; apex strongly sinuate near the sides, the edge thence to the inner 

 angles feebly, anteriorly oblique and straight ; disk unimpressed, with a black 

 cloud near the scutellum and another longitudinal near the flanks, not attain- 

 ing base or apex. Abdomen just visibly narrower than the elytra, not longer 

 than the anterior parts ; sides parallel, the fifth segment slightly narrowed, 

 distinctly longer than the fourth ; border thick ; posterior edges of tergites 



