214 MEMOIRS ON THE COLEOPTERA 



defined by me under the name oregonus, except that the hind tibiae are 

 said to be bispinulose. It is 4 mm. in length and from San Diego Co., 

 California. 



The abruptly smooth rounded extension of the external anterior 

 tibial teeth in the arcuatus section, as though the obtusely worn 

 basal part of gigantic spiniform processes, is a remarkable feature 

 of those species, also visible in the tridentate and other sections of 

 the subgenus, though in greatly reduced form; it is probably the 

 accidental wearing away or loss of this apical spine that gives rise 

 to the bifid tip generally seen in the terminal tooth of the tridentate 

 species of this subgenus. Frequently, however, as in sexstriatus, 

 the large terminal tooth is truly bifid, each prominence having a 

 worn terminal spine. 



Subgenus Hister in sp. 

 Group Sexstriatus. 



The examples serving as exponents of sexstriatus in most cabinets, 

 exhibit extraordinary diversity in size of the body, and this alone 

 might arouse suspicion concerning their specific unity; I find that 

 there are three forms among my material as follows : 



Frontal stria interrupted medially, the ends bent backward. Body nar- 

 rower, more parallel and oblong; marginal stria of the pronotum 

 attaining the base or very nearly; elytra with the fourth, fifth and 

 sutural striae represented by feeble apical remnants; propygidium 

 coarsely, shallowly and rather loosely punctate, the pygidium not 

 quite so coarsely but more closely; prosternal lobe with the marginal 

 bead interrupted medially; anterior tibiae with three small teeth and 

 one broad, apical and broadly bifid. Length 5.7-6.0 mm. ; width 3.9- 

 4.15 mm. California (two examples taken by the writer at San 

 Francisco) maritimus n. sp. 



Frontal stria rectilinearly transverse or very nearly so, entire or in- 

 terrupted; body more broadly oblong-oval 2 



2 Body of large size; prothorax only moderately transverse, the sides 

 arcuate, the inner lateral stria widely distant from the marginal, 

 which attains the base or very nearly; elytra with distinct apical 

 remnant of the fourth stria but without even an evident trace of the 

 fifth or the sutural; pygidia almost similarly but more loosely punc- 

 tate, the pygidium also somewhat more coarsely; sterna nearly 

 similar; anterior tibiae with three or four smaller teeth and one, large 

 and broadly bifid, at apex. Length 7.3-8.5 mm.; width 4.7-5.3 mm. 

 California (near San Francisco). Four examples, .sexstriatus Lee. 



Body of very much smaller size and relatively still broader outline, the 

 elytra more prominently inflated subbasally; cephalic stria deep and 

 coarse, evenly arcuate at the sides, transversely evenly, feebly ar- 



