440 MEMOIRS ON THE COLEOPTERA 



hyaline and transparent apical part throughout the width, this hyaline 

 membrane acutely and cuspidately incised at the middle; the chitinous 

 part is broadly bilobed, with an acute median notch, the lines throughout 

 subparallel to those of the limb of the hyaline membrane, the chitinous 

 surface not at all impressed; anterior tarsi slender. Length (cf) 4.2-4.4 

 mm.; width 0.73 mm. British Columbia (Metlakatla), Keen. Two 

 examples. 



Although very isolated in all its characters, this species may be 

 placed near micro phthalmus in the lists. 



Philonthus nanellus n. sp. Very small, rather stout, attenuate an- 

 teriorly, polished, piceous-black, the head and abdomen deep black, the 

 legs flavo-testaceous; antennae much longer than the head and prothorax, 

 moderately incrassate, blackish, very gradually testaceous basally, the 

 outer joints as long as wide; head oblong, slightly elongate, the eyes some- 

 what convex, at fully twice their length from the base, the long tempora 

 feebly converging and nearly straight, rapidly rounding at base; prothorax 

 slightly elongate, distinctly wider than the head, rounded at base, the 

 sides thence distinctly converging and nearly straight to the apex, the 

 apical angles obtuse and rounded; punctures rather coarse and deep; 

 scutellum moderate; elytra as long as wide, distinctly longer than the 

 prothorax, at base very slightly wider than the latter, at apex very much 

 wider, the straight sides rather strongly diverging ; punctures rather coarse, 

 impressed, well separated, the pubescence short and sparse; abdomen 

 slightly conical, finely, rather sparsely punctulate, flavate at tip; sixth 

 ventral (cf ) with a broad and gently rounded, very shallow apical sinus, 

 adjacent to which the surface is angularly impressed, the impression 

 about twice as wide as deep; it is so deeply impressed that the integument 

 is thinned to the consistence of a hyaline membrane; anterior tarsi slender. 

 Length (cf) 3.0 mm.; width 0.68 mm. Northern Illinois (Highland 

 Park). Taken by the writer. 



This species can also be placed near micro phthalmus, but it is 

 very much smaller in size, with broader and more conical prothorax 

 and very different male sexual characters. 



The following species is peculiar in having six discal punctures 

 in each of the pronotal series as in albionicus, instabilis and pici- 

 cornis, the series regular as usual: 



Philonthus adustus n. sp. Form very much elongated and slender, 

 highly polished throughout and deep red-brown in color, the head and 

 abdomen but little darker; legs piceo-rufous; antennae dark brown, 

 blackish basally, not quite as long as the head and prothorax, rather thick 

 but barely incrassate, the outer joints as long as wide; head oval, elongate, 

 feebly subinflated posteriorly though with broadly arcuate sides, the eyes 

 small, at nearly three times their length from the base; neck half the total 

 width; prothorax elongate, subparallel, evidently wider than the head, 

 circularly rounded behind, somewhat wider anteriorly rather than pos- 



