NORTH AMERICAN COLEOPTERA. 29 



D. terebrans 01. 



Very variable ; what may be considered as typical specimens 

 have the front strongly granulate-punctate; occiput densely and 

 J, J obviously punctured ; thorax equally so, punc- 

 tures coarser ; median thoracic line entire, sub- 

 carinate ; thorax at base strongly bisinuate; 

 elyti-al punctures distinct, transverse, closely 

 a. placed ; interstices rough in their whole extent ; 

 color reddish brown. Length 5.2 — 8.5 mm. ; 

 .20— .34 inch. 



Eastern States, California, Washington. 



The following variations may be recognized : 



a. — More coarsely punctured, shining ; asperities of elytra form- 

 ing more or less distinct, transverse rugte, especially toward the 

 base. Elytral puncture indistinct. Represented by a large pitchy 

 black specimen from Maryland in Mr. Ulke's collection. 



h. — Concavity of middle of epistoma somewhat extended upon the 

 front, where it ends in a curved, but obscure ridge; generally more 

 shining and less densely punctured. Punctures and asperities less 

 pronounced. Smooth thoracic line more or less interrupted. Color 

 as in the type, rai-ely darker. The bisinuation at base of thorax is 

 less strong. 



Washington, California, Colorado, Arizona, Idaho. 



c. — Front with a central impression ; occiput convex, very finely 

 punctured. Thorax more finely punctured, basal bisinuation feeble, 

 elytral punctures sharply defined, asperities less so. 



New Mexico, Nevada, Arizona, California. 



rf.— Front convex, feebly roughened ; occiput very finely and re- 

 motely punctulate. Base of thorax scarcely bisinuate; in fact, 

 viewed from above, it appears strongly emarginate. Elytral punc- 

 tures smaller and much less evident than in the preceding variety. 

 Three specimens, a little below average size, were taken by me in 

 Schuylkill County some years ago. 



The characters given in the table make the identification of this 

 species at once easy and certain. 



D. rufipeiiniiif Kirby. 



The most variable species. The simply clavate scape and form 



