NORTH AMERICAN COLEOPTERA. 31 



Thorax densely and finely punctured and strongly narrowed ante- 

 riorly. Elytral declivity roughened. Hairs long. Length 6 mm. ; 

 .24 inch. 



Oregon, California, Colorado, Canada. 



Two specimens in my collection from Sylvania, Cala., have the 

 elytral declivity very slightly asperate and the hairs much shorter. 



D. simplex Lee. 



Resembles the last species in general form and also somewhat 

 in the formation of the epistoraa. The median segment, however, 

 never extends beyond the lateral segments and 

 the sides are always oblique; the surface is 

 rather convex and roughened. Head convex, 

 wnth one or two longitudinal impressions, 

 a Sutures of club transverse. Thorax rather 



^ ^ \ coarsely punctured. Length 5.0 — 6.2 mm. ; 

 .20 — .25 mm. 

 Michigan, Colorado, Lake Superior, California. 

 Seven specimens before me present scarcely any variation. This 

 species is readily distinguished from the preceding ones by its much 

 smaller size and from the two following by its strongly narrowed 

 thorax. 



D. approximatus n. sp. 



Elongate cylindrical, rather shining and thinly clothed with 

 moderately long, yellow hairs. Head broad ; front coarsely granu- 

 late, channeled. Antennae, second joint 

 of funicle longer than the first; club 

 large, sutures curved ; middle segment of 

 epistoma shorter than the lateral seg- 

 ments, sides strongly oblique; surface 

 concave. Thorax about one-half wider 

 than long, slightly narrowed anteriorly ; 

 shining, punctures moderate, not closely 

 placed- smooth median line indistinct; a strong transverse im- 

 pression about one-fourth from the anterior margin ; base strongly 

 bisinuate. Elytral striae moderately impressed, punctures con- 

 fused, interstices asperate. Hairs more conspicuous on the de- 

 clivity. Length 5—6 mm. ; .20 — .24 inch. 



Four specimens, two % I and two $ $ from New Mexico and 

 Colorado in Dr. Horn's collection are before me. But for its large 



