378 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Habitat. — Plentiful about sand dunes along the coast of California, 

 northward to Oregon. 



Number of specimens studied, 400. 



Type in the Eschscholtz collection? 



Type-locality. — San Francisco, California. 



Salient type-characters. — Thorax transverse, densely punctate, sides 

 rounded and scabrous. El^-tral punctures on the dorsum simple, 

 granulate laterally. Antenna^ clavate (Eschscholtz). 



Diagnostic characters. — The following characters seem to show 

 conclusively that scahrosa is more closely related to clavicornis than 

 to parincollis with Avhicli it has for a long time been associated by the 

 more recent authorities: the sculpturing is quite similar in the tAvo 

 species, the setose sides of the pronotal disc and ])ropleura^, clavate 

 antennae, elongate and narrow dorsal plates of the valves of the geni- 

 tal segment in the female characters not observed in par vicolUs '^ the 

 sculpturing is also much coarser than is observed in the latter species. 



/Scahrosa differs from clavicornis in having the antenme shorter, 

 a coarser and denser cephalic and pronotal punctuation, a much 

 broader ])ronotum, which is not so declivous at the sides and more 

 strongly sinuate before the l)asal angles, the very short cliscal seta^, 

 those of the proi:)leura3 being noticeably shorter; the male is also 

 more robust. 



The present species is smaller than the average individuals of 

 parvicollis. So, in view of these differential facts I am forced to 

 restore this sj^ecies of Eschscholtz's to specific standing. 



The elytral sculpturing is quite similar to that observed in cordata^ 

 but in the latter species the pronotal sides are more strongly rounded 

 anteriorly and more suddenly narrowed behind, becoming subangu- 

 late at times ; the pronotal punctuation is much coarser and the inter- 

 vals convex, the pronotum is more cordate in the one and more trans- 

 versely oval in the other. I am indebted to Professor Fall for com- 

 parisons made with the LeContian specimens at Cambridge. 



General observations. — In scahrosa the mentum is larger and more 

 broadly rounded at apex than in clavicornis (compare figs. 5 and d 

 of Plate 8) ; usually quite parabolic in outline, sometimes subtri- 

 angular; surface convex along the median line and slightly sub- 

 foveate laterally, moderately punctate, setae not noticeable. 



The prosternum is quite ])rominent ventral ly with the coxas 

 rounded antero-posteriorly between the same and not mucronate. 



The metasternum laterally between the coxa? is as long as the 

 width of a mesotibia at apex. 



The intercoxal process of the abdomen is quadrate (male) or more 

 or less transverse (female), and a fourth to a third of its width 

 broader than the metasternal salient ; the post-coxal portion of the 



