384 SCOLYTID.E. 



[LeConte. 



District of Columbia; Ulke. This species differs from the next by the 

 third interspace of the elytra being less elevated on the declivity, and the 

 second less evidently narrowed. The punctures of the elytral striae are 

 also larger. A greater number of specimens will probably show that these 

 differences are not of specific value. Length 1.5 mm. ; .06 inch. 



3. O. bicristatus Chapuis, loc. cit. 97. 



Georgia, two females ; under pine bark. Length 1.8 mm.; .07 inch. 



DENDROCTONUS Er. 



The body is stout cylindrical, narrowed in front, punctured and hairy ; 

 the funicle is 5-jointed, the first joint rounded, but not large ; the other 

 joints gradually increasing in breadth ; club rounded, strongly compressed, 

 scarcely pubescent, divided by three transverse v straight sutures. Pro- 

 thorax slightly emarginate in front, bisinuate at base. Prosternum not 

 very short in front of the coxae, broadly concave, with traces of a ridge 

 each side, as in Phlwosinus and Blastophagus ; front coxae contiguous. 

 Tibiae moderately dilated, with a few large lateral and apical teeth ; terminal 

 spine stout and straight ; tarsi with joints 1-3 slightly decreasing in length; 

 third wider, deeply bilobed, fourth small, distinct; fifth as long as the 

 others united. Ventral segments nearly equal in length ; the first suture 

 is straight, the others strongly curved backwards at the side. 



The species depredate upon pine trees, and are closely allied and difficult 

 to distinguish ; the dorsal line of the prothorax varies in individuals of the 

 same species; I cannot change the table I have given in the memoir cited 

 below except by adding one new species. 



Prothorax narrowed in front, slightly bisinuate at base 2. 



" very slightly narrowed in front, strongly 

 bisinuate at base ; head large 7. frontalis. 



2. Interspaces rough both on the disc and on the de- 



clivity 3. 



Interspaces rough towards the base, but only punc- 

 tured on the declivity 4. 



3. Prothorax very densely coarsely punctured ; hairs of 



elytra not very long. . . 1 . terebrans. 



Prothorax less densely punctured ; hairs of elytra 



long 2. similis. 



4. Prothorax punctured with smaller punctures inter- 



mixed, hairs of elytra long 3. ruflpennis, 



Prothorax equably punctured, occiput finely punc- 

 tured, hairs of elytra long 4. punctatus. 



Prothorax equably punctured, \>cciput sparsely punc- 

 tured, hairs of elytra long ; smaller, with broader 



prothorax 5. simplex. 



Prothorax finely sparsely punctured ; elytra opaque, 

 densely, finely granulated and punctulate, pubes- 

 cence very short 6. brevicomis. 



