NORTH AMERICAN COLEOPTERA. 219 



S. truncaticeps u. sp. — Slender; sides nearly parallel; black, posterior 

 margins of the four basal abdominal segments paler; legs castaneous, paler 

 toward tip; palpi and antennge reddish-brown throughout; pubescence very 

 fine, short, rather dense, pale fulvous in color, more conspicuous on the pro- 

 notum toward the apex; integuments shining. Head robust, rather depressed, 

 very slightly longer than wide; sides parallel, feebly arcuate behind the eyes; 

 base truncate and very feebly arcuate; angles rather broadly rounded; surface 

 rather feebly convex, broadly impressed between the antenna, very finely aud 

 densely punctate, the punctures deep and much sparser in the middle anter- 

 iorly, slightly sparser posteriorly; antennae slightly shorter than the head and 

 prothorax together; basal joint distinctly longer than the next two combined, 

 second slightly more robust and a little shorter than the third, the latter much 

 longer than the fourth, joints four to ten decreasing gradually in length, the 

 latter slightly longer than wide. Prothorax distinctly narrower than the 

 head, widest slightly in advance of the middle, but slightly more than one- 

 third longer than wide; sides in the anterior third strongly convergent and 

 distinctly sinuate to the nuchal emargination which is broadly and feebly sin- 

 uate, in the posterior two-thirds moderately convergent and distinctly arcuate 

 to the base which is narrowly truncate in the middle; angles rather broadly 

 rounded; apical angles very obtuse and very broadly rounded; disk very 

 broadly and feebly convex, minutely and not very densely punctate, with a 

 narrow impunctate median line, having also a very short median basal carina 

 extending thence as a very fine, nearly obsolete stria nearly to the middle. 

 JS'/^/^ra at base one-fifth wider than the prothorax; sides nearly parallel and 

 straight; together almost transversely truncate behind; disk rather feebly 

 convex, impressed on the suture toward the scutellum, finely, evenly and not 

 very densely punctate; punctures slightly finer exteriorly and apically; suture 

 finely margined, margin very gradually finer toward base. Abdomen at base 

 slightly narrower than the elytra; sides very feebly divergent and nearly 

 straight; surface rather feebly convex, very minutely and densely punctate ; 

 basal segments transversely impressed at base, with the impressed areas much 

 more coarsely and densely punctate; fifth segment much shorter than the two 

 preceding together. Legs rather short and slender; first joint of the posterior 

 tarsi scarcely one-fourth longer than the second, much shorter than the fifth. 

 Length 4.0 mm. 



California; (Anderson Val., Mendocino Co. 1). 



Described from the female in which the sixth segment is 

 broadly angulate, with the apex of the angulation scarcely 

 at all rounded; sides forming the angle broadly and feebly 

 incurvate. 



This line species is readily distinguished from the pre- 

 ceding by its form, size and sexual characters. 



