June, 1898] Casey: North American Coleoptera. 65 



Basal joint but slightly shorter than the entire remainder, the second joint relatively 

 much shorter ; pronotum not impressed sublaterally at base 2 



2 — Pleural sulcus below the humeri deep and strongly marked ; elytra twice as long 

 as wide ; eyes separated by evidently more than three times their own width. 

 Body rather stout, the elytra subdilated near the tip, blackish-piceous above, 

 the legs and antennce dark rufous or rufo-piceous ; surface feebly shining, the 

 pubescence extremely short, pale, dense and conspicuous on the elytra. Head 

 short, inserted to the eyes, dull, the epistomal impression well marked. Pro- 

 thorax three-fifths wider than long, rounded at apex, the sides thence strongly di- 

 verging and feebly sinuate, becoming parallel and broadly rounded in basal half; 

 basal angles rounded. Elytra twice as long as wide, more than three times 

 as long as the prothorax and fully as wide, a little wider at apical third ; humeral 

 angles rounded. Length 3.7-4.5 mm.; width 1. 3-1-7 mm. California (Sta. 

 Cruz Mts. ) . . pleuralis, sp. nov. 



Pleural sulcus narrow and feeble 3 



3 — Elytra fully twice as long as wide; eyes small, separated by fully four times their 

 own width. Body very slender, nearly as in pleuralis but narrower, the elytra 

 not distinctly wider behind and fully three and one-half times as long as the pro- 

 thorax, the latter nearly similar in outline but still more transverse, the sides be- 

 coming parallel in less than basal half, with the median line similarly finely im. 

 pressed anteriorly. Length 2.9 mm.; width 1.0 mm. California (locality not 

 indicated ) macer, sp. nov. 



Elytra much shorter, three-fourths longer than wide ; eyes more convex and better 

 developed, separated by three times their own width. Body suboblong, moder- 

 ately convex, dull, blackish, almost similar throughout to pleuralis but shorter, 

 the prothorax relatively rather smaller and the elytra much shorter, not distinctly 

 dilated subapically, and with the minute subgranuliform rugulosity still finer 

 and the pubescence a little denser, the fine strias distinct to the summit of the 

 convex declivity. The hind tarsi are longer than in pleuralis. Length 3.4 

 mm.; width 1.25 mm. California (locality not indicated) . . saginatus, sp. nov. 



The descriptions are derived throughout from the female, the only 

 male accessible to me being one of the four examples of pleuralis. This 

 male is very much smaller and narrower than the female, with the eyes 

 better developed and separated by slightly more than twice their own 

 width; the prothorax is more transverse and almost semicircular. in 

 outline from the base around the apex, near which it is perhaps more 

 correctly broadly parabolic; the last ventral segment is simple, rounded 

 ta apex and not quite as long as the two preceding combined ; the an- 

 tennae do not differ essentially in structure from those of the female, but 

 are rather more slender. 



Bostrichini. 



The genera of Bostrichini have not been considered in their mutual 

 relationships for twenty years, when a review of them was published by 

 Dr. Horn. I find it necessary to increase the genera recognized by 



