304 Coleopterological Notices, VII. 



teriorly by a nearly transverse line in dentatum, and the striae are 

 more distantly punctured. Dentatum is more southern in its 

 range, San Francisco being about its northern limit. 



O. gemma. — Eather convex and narrowly oMong-oval, very highly pol- 

 ished ; dark maculation black with bright green metallic reflection, becom- 

 ing bluish or violet on the head, exceeding the pale areas in extent. Head 

 with the pale frontal area limited behind by a line which has a deep rounded 

 median sinus, the metallic basal area rather strongly punctate, densely so to- 

 ward the sides. Prothorax slightly more than twice as wide as long, the sides 

 strongly arcuate, convergent anteriorly biit becoming parallel behind the mid- 

 dle ; punctures distinct over the entire surface to the extreme lateral edges, 

 but less obvious in a small transverse area at the middle of the disk ; lateral 

 acute edges very fine ; dark metallic area extending almost to the sides, broadly 

 attaining the apex at the middle and still more broadly the base; median line 

 fine but strong. Elytra almost evenly oval, as long as wide, slightly wider 

 than the prothorax, the striae fine and only moderately and narrowly impressed, 

 the intervals but feebly convex ; striae somewhat uneven, the tenth and 

 twelfth convergent basally, the eleventh not attaining the base ; punctures 

 fine and approximate, not attaining the apex. Under surface pale red-brown 

 throughout, the sides and legs pale luteo-flavate. Length 4.75-5.0 mm. 

 width 2.8-3.0 mm. 



California (Humboldt Co.). 



The irregularity described" above in the elytral striation, which 

 also characterizes solidum and dentatum to some extent, together 

 with the small size, oblong form, highly polished integuments 

 and bright green metallic reflection, will render the identification 

 of this species at all times easy. I obtained a considerable series 

 on the sandy banks of the Eel river, near its entrance into Hum- 

 boldt Bay. It varies surprisingly little in size, while solidum 

 varies much in this respect. 



O. sonorae. — Broadly oval and strongly convex, polished ; dark areas pre- 

 dominating and black with a feeble greenish-metallic lustre; pale areas dis- 

 posed nearly as in ohliteratum, the head with a triangular frontal pale area; pro- 

 notum black, with a narrow pale lateral margin, broadly extending inward 

 anteriorly and narrowly and more briefly posteriorly, the median apical exten- 

 sion of the black area rather narrow and becoming piceous in color; pale areas 

 of the elytra sharply defined, disposed nearly as in ohliteratum. Head coarsely 

 but rather sparsely punctured in the basal metallic area ; impunctate anteriorly, 

 the labrum more fiavate. Prothorax slightly more than twice as wide as long, the 

 sides but feebly convergent from base to apex and feebly arcuate; median line 

 distinct; punctures coarse but rather sparse, extending over the entire surface 

 to the basal angles but wanting in an impressed marginal area in apical half 

 or more, and finer near the centre of the disk. Elytra not as long as wide, 

 much wider than the prothorax, the humeral curvature to the basal line being: 



