June 1900.] 



Casey: On North American Coleoptera. IH 



impressed and somewhat close-set. Length I.3-I.65 mm.; width 0.55-0.6 mm. 



California (Siskiyou Co.) nigricolhs, sp. nov 



Body piceous, the elytra and antenna, slightly paler and rufous, the pubescence short 

 but rather abundant ; prothorax well developed, scarcely more than a third wider 

 than long, parallel and broadly, feebly sinuate at the middle of the sides, arcu- 

 ately and equally narrowed at apex and base, the surface rather strongly convex 

 only moderately finely, deeply and very closely perforato-punctae ; elytra wel 

 developed, fully three-fourths longer than wide, parabolically rounding in apical 

 two-fifths, parallel and almost straight thence to the base, the punctures rather 

 fine but deep, close-set and arranged without order. Length I.6-I.9 mm.; 



width 0.6-0.72 mm. Cahfornia longipenn.S, .sp- nov. 



27-Body evenly dark rufo-testaceous throughout, moderately convex and shining, the 

 pubescenee very short but somewhat abundant; antennx moderate; prothorax 

 nearly one-half wider than long, the sides conspicuously and rather narrowly 

 prominent at basal third, thence strongly converging to the base and more grad- 

 ually so and nearly straight to the apex, which is not distinctly narrower than the 

 base • disk more convexo-declivous near the basal margin than in the three pre- 

 ceding species but not properly impressed, the punctures fine and rather enevenly 

 close-set, becoming very minute and sparse broadly along the middle; elytm 

 short and broad, the punctures very fine but distinct and moderately close-set al- 

 together irregular in arrangement. Length I.4 mm.; width 0.68 mm. Call- 



,^ . subdentata, sp. nov. 



forma 



Oc-/uvnife;is quite strongly resembles sfric-fu-o/Z/s, but differs in the 

 more slender form of the body and in the very much more minute 

 and sparse punctuation. The species described under the name /^ar- 

 vicoUis is represented by a unique, as is also the form with senately 

 punctured elytra which I have surmised to be its male ; more material 

 is necessary to decide this rather puzzling point, as the difference m 

 elytral sculpture is certainly very marked. I have, however, noticed 

 at times a slight sexual difference in density and arrangement of punc- 

 tures elsewhere in the family. FuscicoUis of Mannerheim, and plamdata 

 of Maklin, I have not seen, the latter is described as oblong, de- 

 pressed, fusco-testaceous, finely and densely punctate with the legs 

 and elytra rufo-testaceous. 



Atomaria Stepli. 

 The species of this genus are less numerous in America than Aga- 

 thengis, and for the most part present a rather monotonous appearance. 

 The^'body is generally oblong-oval and convex, shining and sparsely 

 clothed with short subdecumbent hairs. The antennae are usually 

 slender, moderate in length, with the basal joint short and oblong 

 or more developed internally toward base than externally ; the joints 



