HlSTERID^ 257 



distantly crenulate; anterior tibiae with the external denticles more 

 numerous. Length 2.5 mm.; width 1.7 mm. California (San Fran- 

 cisco). 



The differences between this species and idiopygns are stated in 

 the description; from deletus it differs in its stouter form, more 

 widely separated prosternal striae and longer, apically more nar- 

 rowly rounded pygidium, among many other features. 



Gnathoncus insolarcus n. sp. Form more narrowly oval than in 

 either of the preceding, similar in coloration and convexity; head mi- 

 nutely, not very sparsely punctate; prothorax relatively short, nearly 

 twice as wide as long, the sides moderately converging and slightly, 

 subevenly arcuate from base to apex, a little more rounding apically, 

 the marginal groove coarser; punctures fine and sparse but distinct, 

 gradually stronger and closer laterally to the sides and with some scat- 

 tered coarser punctures along the base; scutellum acute, but slightly 

 elongate, much less minute or narrow than in idiopygus; elytra distinctly 

 wider than the prothorax and almost twice as long, but very slightly 

 shorter than wide, feebly inflated basally and with very broad truncate 

 apex; punctures strong, even, not very close, distinct though minute 

 and sparser basally; four discal striae rather fine, shorter than usual and 

 barely extending to the middle; outer subhumeral fine, basal, the inner 

 extremely fine and short, at the middle, the oblique humeral very short 

 and close to the first dorsal; sutural stria and basal arcs as in deletus; 

 pygidium convex, as wide as long, obtusely rounded at tip, with the 

 umbilicate punctures rather strong and somewhat close-set, somewhat 

 confused apically; prosternum punctate between the striae; anterior 

 tibiae with four or five denticles. Length 2.35 mm.; width 1.55 mm. 

 California (Lake Co.), -Fuchs. 



The chief distinguishing character of this species is the short 

 discal striae of the elytra, also the relatively large elytra and smaller 

 prothorax. It is more narrowly oval than the two other species 

 here described, being more nearly like deletus in this respect, but 

 with a shorter and narrower prothorax, broader elytra, with more 

 evenly disseminated punctures and very much shorter and finer 

 four discal elytral striae. 



Saprinus Erichs. 

 Subgen. Saprinus in sp. 



This subgenus is confined to those species with anteriorly un- 

 margined head and they are very numerous. Those here brought 

 to notice may be separated into several groups, which in general 

 conform to those defined by Horn as follows: 

 T. L. Casey, Mem. Col. VII. Nov. 1916. 



