208 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Abdomen sparsely and quite evenly punctate, more or less irregu- 

 larly and reticulately rugulose ; punctures denser on the fifth segment 

 and finely setose. 



Legs moderate in length and very stout Anterior femora in both 

 sexes, armed with an acute tooth near the external fourth; tibial 

 spurs slightly broadened, those of the protibise equal and acute. Tarsi 

 similar in the sexes and rather strongly spinulose. 



Male. — Robust. Elytra oblong oval and at least twice as long as 

 wide, nearly vertically declivous posteriorly. Abdomen moderately 

 oblique, not strongly convex ; segments one and two broadly and more 

 or less strongly impressed. Tibial spurs feebly broadened. 



Female. — Very robust. Elytra broadly oval and less than twice 

 as long as wide, vertically declivous posteriorly. Abdomen hori- 

 zontal rather strongly convex, and not impressed. Tibial spurs 

 noticeably broadened. 



In the material before me two forms can be recognized, notably 

 those from central California, and those from southern California, 

 Arizona and Low'er California. Mannerheim's type was undoubtedly 

 collected somewdiere in the vicinity of San Francisco. 



Forma typica. — Thorax narrower with the sides not strongly 

 rounded, and the apical angles frequently less strongly marked. 

 Elytra less broadly oval, so that the general form is less robust and 

 narrower. 



Measurements. — Males: Length, 27-29 mm.; width, 10.5-11.5 mm. 

 Females: Length, 29 mm.; width, 11.5-12 mm. 



Forma valida. — Thorax broader and more strongly rounded at the 

 sides; elytra broadly oval, and the general form much more robust. 



Measurements. — Males: Length, 29.-32. mm.; width, 10.5-11.5 mm. 

 Females: Length, 32.5-34. mm.; width. 14.-15.5 mm. 



Genital characters^ male. — Edeagophore comparatively small and 

 elongate oval. 



Basale suboval, widest in basal half, evenly convex from side to 

 side, slightly arched; dorsum with a ratliei* strong antero-posterior 

 convexity and not gibbous in basal half, apically much narrower 

 than at middle and the sides rather strongly arcuate. 



Aplcalc small and rather elongately triangular; surface evenly 

 convex, not grooved ; sides nearly straight, scarcely sinuate, the apex 

 being sliglitly ])roduced and very narrowly rounded at tip: base Avith 

 the median third obtuse, not rounded nor acute and feebl}^ sinuate 

 laterally. 



fiternite slightly transverse. P^ach lobe rather long, broadly 

 rounded at tip, angle scarcely evident; external border nearly 

 straight and rather strongly convergent apically; internal margin 

 slightly arcuate or straight ; surface quite densely punctate in apical 



