Coleopterological Notices. 121 



and extremely slender. The metasternal process is rather narrower 

 than usual in this genus. 



A. tieblllOSIlS n, sp. — Ver^' broadly oval and moderately convex, about 

 one-half longer than wide ; elytra feebly attenuate from base to near the apex, 

 then conjointly evenly rounded, subalutaceous, castaneous ; head, pronotum, 

 each elytron obliquely at apex, and a small indefinite spot at the base of each 

 elytron, nearer the humerus than the scutellum, paler, rufo-testaceous ; under 

 surface, legs and antennae very pale testaceous. Head extremely minutely, 

 sparsely punctate, not reticulate ; eyes moderate ; antennae slender, joints one 

 to eight elongate, club moderate, the eleventh joint about as long as the two 

 preceding together. Prothorax distinctly more than twice as wide as long ; 

 basal lobe very broad, feeble, transverse opposite the scutellum ; bead fine 

 but rather distinct, not extending laterally beyond the lobe ; surface polished, 

 extremely minutely and obsoletely i^unctate, very feebly strigilate in wavy 

 transverse lines which become almost obsolete toward apex. Scutellum ogival, 

 slightly wider than long. Elytra strongly and distinctly, but very minutely 

 strigilato-reticulate in broken transverse wavy lines throughout, alutaceous 

 in lustre, having series of very small feeble crescentiform punctures which 

 become larger laterally, and rather confused near the sides ; intervals each 

 with a very irregular line of similar though extremely fine punctures ; discal 

 stria fine but distinct, obsolete at basal fourth. Abdomen reticulate, very 

 sparsely pubescent. Legs moderate, the posterior femora not unusually 

 robust. Length 2.2 mm. 



California (Fort Yuma). 



The posterior tibiae are but slightly more robust and dilated in 

 the male, the terminal spurs in that sex being- extremely unequal, 

 the longer nearly three times as long as the shorter, and rather 

 longer than the apical width, the corresponding tarsi being rather 

 robust, the second joint nearly four times as long as the first, and 

 slightly longer than the entire remainder, spongiose along the mid- 

 dle beneath throughout the length, the spongiose area being limited 

 laterally, as usual, by tAvo lines of long, very closely-placed and 

 slender setoe ; first joint not at all produced beneath the second, the 

 attachment apparently rigid. In the female the spurs are smaller 

 and more nearly equal, the larger but twice as long as the smaller, 

 the tarsi more slender, especially the second joint which is not 

 spongiose beneath. 



The metasternal process is very broad, and the sternal structure 

 in general very similar to that of the typical forms. 



The setae at the apex of the prosternal process appear to be nor- 

 mally three in number, but the middle one is occasionally absent, and 

 there may sometimes be one which is superfluous and sporadic. In 



