404 MEMOIRS ON THE COLEOPTERA 



apically; head rather elongate, more than three-fourths as wide as 

 the prothorax, with prominent mandibles, extremely broad deep 

 sulci and rather prominent though moderate eyes; antennae piceous, 

 very slender, much more than half as long as the body; nuchal con- 

 striction very feeble and diffuse, with fine punctures; prothorax two- 

 fifths wider than long, widest at the middle, the sides thence feebly 

 converging and nearly straight to the broadly rounded apical angles, 

 broadly and moderately sinuate basally, becoming very gradually 

 parallel in about basal sixth, the angles right and sharply defined; 

 margins reflexed, deeply so only in apical half; apex feebly sinuate, 

 transverse; impressions both evident but feeble and diffuse, both 

 plentifully and sharply punctulate; stria deep, biabbreviated; foveae 

 broadly and deeply impressed, sublinear, the outer short, linear, 

 feeble and indefinite; elytra three-fourths longer than wide, one-half 

 wider than the prothorax, gradually ogival in nearly apical half, with 

 long and very feeble sinus; sides very gradually a little more arcuate 

 basally; striae fine but sharp, finely punctulate, evidently impressed, 

 rather deeply so inwardly, entire, the seventh distinct and impressed, 

 the ninth midway between the eighth and margin; intervals feebly 

 convex. Length (9) 10.5 mm.; width 4.0 mm. California (Red_ 

 wood Creekr, Humboldt Co.)' filicornis n. sp 



The elytra in this genus and Patrobus are very much as in Ptero- 

 stichinse, resembling them especially in the disposition of the ninth 

 stria, but they differ in having no basal margination and in the rather 

 conspicuous declivo-explanate postero-lateral part of the surface, 

 which is feebly traceable also in Pogonus. The five last described 

 species of the table are doubtless allied to the Alaskan aterrimus 

 Dej., which I have not seen, and they approach the genus Patrobus 

 more closely in general outline, and especially in the more cordiform 

 prothorax, than they do the larger parallel forms with greatly de- 

 veloped male hind trochanters; but that they do not strictly form 

 a bond between the two genera, can be shown by the system of 

 sculpture, form of the pronotal foveae and sexual modifications of 

 the hind trochanters, which are exactly of the same nature as in 

 the larger species, though less developed; also by the feeble nuchal 

 constriction, more flattened upper surface of the body and general 

 habitus. 



The first elytral stria is bent outwardly toward base, ending in 

 the ocellate puncture at the base of the second stria; the long scu- 

 tellar stria lies between the basal part of the first and the scutellum 

 and basal part of .the suture, and is not connected in any way with 

 the ocellate puncture, as is usual with the scutellar stria. I have 

 noticed this same peculiarity in Trechns. In Anophihalmus there 



