722 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



This beetle, abundant in the New England States, is not uncommon 

 in Colorado. I met with it at Blackhawk and at Manitou. It prob- 

 ably bores in the pines and spruces of the Rocky Mountains. It is 

 short and stout, reddish brown, the head and prothorax smooth and 

 sbiniiiff, though finely i)unctured, while the wing-covers are coarsely 



punctured and dull-colored, being a little 

 darker than the rest of the body. Length, 

 0.35 inch. 



Le Conte states that he has received speci- 

 mens from Alaska, Canada, and Anticosti. I 

 have a specimen from Tacoma, Wash., identi- 

 fied by Dr. Horn. It is a common northern 

 species. It is only to bedistinguished from D. 

 siniilis, says Le Conte, by the declivity of the 

 elytra being smoother and more shining, and 

 almost without asperities; and by a slight 

 difference in the punctures of the prothorax, 

 which are of unequal size. The dorsal line of 

 the prothorax is sometimes narrow and ele- 

 vated, sometimes obsolete. Length, 6™"" (.24 

 inch). The distinctive characters given by Le Conte are these : Pro- 

 thorax punctured, with smaller punctures intermixed; hairs of elytra 

 long. We have found it at Providence, E. I., in its burrows under the 

 bark of the white pine. 



Allied to these bark-borers, and undoubtedly infesting coniferous 

 trees, are the following: 



Dendroctomis aimilis Le Conte, Colorado. "A smaller and somewhat more elongate 

 form occurs in Canada, Texas, and Colorado, but I do not think it capable of being 

 separated as a distinct species." 



Dendroctomis pun ctatus Le C. New York. 



Dendroctonus simplex Le C. Canada. 



Dendroctomis hrevicornis Le C. Middle California. 



Dendroctonus frontalis Zimmerman. Lake Superior to Georgia. 



Fig. 251. — Poh/ijraphvs rufipen- 

 nig. — Smith and Miss Sullivan 

 del. 



52. The pine hylurgops. 



Hylurgops pinifex (Fitch). 



(Larva, Plate xxiii, fig. 4.) 



Order Coleoptera ; family Scolytid^. 



"A beetle which closely resembles the preceding, and is frequently 

 met with in company with it upon pine lumber in mill yards early in 

 May, requires to be noticed in this place. I am unabla to find any 

 description of this species, although it is so common it can scarcely 

 have been overlooked by authors till this time. It is the Hylastes pini- 

 fex, or the pine-destroying Hylastes of my cabinet. Its habits are 



