[81] 



NORTH AMERICAN COLEOPTERA. 237 



throughout; apex very slightly narrower than the base, broadly aud evenly 

 sinuate; angles rather narrowly rounded; base very feebly arcuate through- 

 out, angles rather broadly rounded; disk broadly, very evenly and rather 

 feebly convex, very narrowly and abruptly explanate at the sides anteriorly, 

 slightly more broadly and less abruptly so posteriorly, extremely finely, 

 evenly and rather closely punctate; punctures slightly asperate; intervals 

 fiuely subgranulose, subilutaceous. Elylra at base very slightly wider than 

 the pronotum; sides rather distinctly but very feebly divergent, very 

 feebly arcuate; humeral angles narrowly, apical broadly, rounded; together 

 truncate behind; disk depressed, broadly impressed in the middle; as long as 

 wide, slightly less than one-half louger than the pronotum, rather coarsely, 

 very evenly, closely and rather strongiy punctate; punctures subasperate; 

 intervals polished. Abdomen at base as wide as the elytra, at the apex of the 

 third segment nearly one-tourth wider; sides strongly arcuate; border rather 

 broad, feebly inclined; surface depressed; three visible basal segments 

 transversely impressed at base; segments two to four finely, evenly and rather 

 densely punctate; segments one, five aud six impunctate; second visible 

 segment with two small, transverse, approximate, minutely rugulose and 

 apparently pubescent patches. Legs moderate iu length, slender. Under 

 surface piceous-black, with exception of the prouotal and elytral hypomera, 

 which are flavate. Length 3.5 mm. 



California; (Marin Co. 1). 



This species resembles veteraior in the general character 

 of its sculpture and pubescence, but differs greatly in 

 general form, and especially in its much less transverse 

 prothorax with but slightly arcuate sides. 



A. pilosellum n- sp.— Males slender; females rather robust, depressed; 

 color rather pale reddish-testaceous, nearly similar in the two sexes; head 

 posteriorly, prothorax anteriorly, and elytra broadly aud very indefinitely 

 toward the suture and apices, clouded with a slightly darker Cistaneous 

 tint; abdomen intense black throughout; antennae fuscous toward tip, basal 

 joints pale testaceous; legs rufo-picaous; pronotum and elytra fiuely and 

 sparsely pubescent, integuments shining. Head very slightly longer than 

 wide, rather depressed, glabrous, finely reticulate or subalutaceous, impunc- 

 tate, broadly and rather feebly impressed between the antennae, feebly, 

 finely and obliquely bistriate between the eyes; autenuae rather short, mode- 

 rately iucrassate, less than one-half as long as the body; basal joint but 

 slightly louger than the third, second nearly as long as the first, as long as 

 the fourth, and slightly longer than the tenth, joints four to eight equal iu 

 length, eight to ten decreasing, the latter but slightly longer than wide. 

 Prothorax widest iu the middle, one-half wider thau long; sides strongly 

 rounded in the middle, feebly convergent aud nearly straight anteriorly and 



17— Bull. Cal. Acad. Sci. II. 0. Issued November 27, 1886. 



