2 MEMOIRS ON THE COLEOPTERA 



Antennae about equal in length in the two sexes, except in fraterculus. .2 

 2 Pronotum very deeply and conspicuously vermiculately rugose. 



Coast regions Group 1 1 



Pronotum feebly and more finely vermiculately rugulose throughout the 



surface 3 



Pronotum smooth, at least centrally 6 



3 Prothorax somewhat as in dejeani in outline, widest near the apex, the 



sides nearly straight and strongly posteriorly oblique. Sierras. 



Group III 



Prothorax with the sides less oblique and always more or less rounded. .4 

 4 Prothorax relatively small; body very elongate; legs notably long. 



Sierras Group IV 



Prothorax as usual, relatively well developed; legs not conspicuously 



long 5 



5 Body narrower, always notably elongate in form. Coast regions. 



Group V 



Body stouter, generally duller in lustre. Sierras Group VI 



6 Body stout, more ventricose, generally dull in lustre. Sierras. 



Group VII 



These groups are rather sharply delimited in structure and 

 general habitus; they will be designated below by the principal 

 species in each case. 



Group I (audouini). 



The species are moderately numerous and are confined to the 

 more northern regions, perhaps more especially near the coast, 

 but of this I am not sure in all cases. 



Body ventricose, the hind body alwa'ys very much wider than the pro- 

 thorax 2 



Body very slender, the elytra more subcylindric and but little wider than 

 the prothorax 7 



2 Elytral punctures strong, irregularly subconfluent, generally without 

 intermingled minute punctures 3 



Elytral punctures feebler, more uniform in distribution and with inter- 

 spersed minute punctures 6 



3 Elytral punctures toward the suture feebler and finely lineiform at 

 the bottom; body massive, the prothorax larger, rather wider than 

 long, the base rather strongly bisinuate; surface between the more 

 rugulose apical and basal regions almost smooth, opaculate, with 

 very fine anastomosing lines and very minute punctulation; elytra 

 widest slightly behind the middle; antennse rather stouter basally 

 than in the other species of the group. Length (c?) 16.0 mm.; 

 width 6.0 mm. California (Shasta Co.), Nunenmacher. 



ambiguus Shpp. 



Elytral punctures more rounded, deeper, not lineiform at the bottom at 

 any part of the surface 4 



