Horn.] 1^4: [Nov. 5, 



Female. Anterior and middle tarsi slightly broader than the posterior, 

 not pubescent beneath. 



In consequence of the hairy head, it is difficult to determine the number 

 of clypeal setigerous punctures. The first two species below have two 

 certainly, and piceus but one. 



The species of this group are as follows : 

 Thorax very distinctly narrowed behind, the sides arcuate. 

 Hind angles of thorax obtuse. Intervals of elytra very irregularlj' 

 biseriately punctulate. Middle tarsi (^ not pubescent beneath. 

 Posterior and middle tibise (^ coarsely tuberculate externally. Sides 



of thorax beneath impunctate 1 . strenuus Horn. 



Tibiae spinulose externally. Thorax beneath punctate.. 2. dilatatusDe]. 

 Hind angles of thorax distinct. Intervals of elytra very regularly and 

 closely biseriately punctulate. Middle tarsi (^ with joints 2—4 

 pubescent beneath. 

 Spurs of hind tibiae slender and acute. 

 Hairs of surface short and erect. Thorax beneath with few obso- 

 lete coarse punctures 3. obtusus Lee. 



Hairs of surface long and scarcely erect. Thorax beneath with num- 

 erous coarse and deep punctures 4. pilosus, n. sp. 



Spurs of hind tibiae short, broad and dilated at tip, 5. immanis, n. sp. 



Hind angles of thorax sharply rectangular 6. bruimeus Dej. 



Thorax scarcely narrower at base, sides feebly arcuate, hind angles ob- 

 tuse. Clypeus with one setigerous puncture on each side. Middle 

 tarsi (^ pubescent beneath. Feebly pubescent 7. piceus Menet. 



1. A. strenuus Horn. Our largest species, easily known in the group 

 by its more robust and convex form and by the under side of the thorax 

 being opaque and impunctured. The middle and posterior tibiae in the 

 male arc roughly tuberculate on the outer margin. I have not seen the 

 female. Length .60 inch ; 15 mm. 



Two specimens ; Fort Tejon, California, 



2. A. dilatatus Dej. With this species I unite hirsutus. It is much 

 more depressed than the preceding species and the elytral intervals feebly 

 convex. The middle and posterior tibiae are simply spinulose externally, 

 and the under side of the thorax sparsely obsoletely punctate. The punc- 

 tures of the elytral intervals are coarse and very irregularly disposed. 

 Length .32— .44 inch ; 8—11 mm. 



Occurs nearly everywhere in California. 



3. A. obtusus Lee. Similar in form to dilatatus, but smaller and with 

 the hind angles of the thorax quite distinct but not prominent, and the 

 disc more densely punctured. The underside of thorax has but few coarse 

 punctures and these not deep. The hairs of the surface are short and erect, 

 those of the elytra arising from the interstitial punctures which are very 

 regularly and densely placed. The middle tarsi of the male have the three 

 intermediate joints pubescent beneath. Length .30 inch ; 7.5 mm. 



Occurs at San Jose, California. 



