722 V1VTH 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 Maniton. It prob- 
ably bores in the pines and Bprnoes of the Rocky Mountains. It is 
short and stout, reddish brown, the head and prothorax smooth and 
shining though finely punctured, while the iring-ooven are coarsely 
pnnctored and dall-oolored, being a little 
darker than the rest of the body. Length, 
0.35 inch. 
Le Coute 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. 
rimUis, says Le Gonte, by the declivity of the 
elytra being smoother and more shining, and 
almost without asperities; aud by a slight 
difference in the punctures of the prothorax, 
-:.-roiwra P hus runpen- ^hieh are of unequal size. The dorsal line of 
».>.-Snnth aud Miss Suiiivan the prothorax is sometimes narrow aud ele- 
vated, sometimes obsolete. Length, 6 mm (.24 
inch). The distinctive characters given by Le Conte are these: Pro- 
thorax punctured, with smaller puuctures intermixed; hairs of elytra 
long. We have found it at Providence, R. I., in its burrows under the 
bark of the white pine. 
Allied to these bark-borers, and undoubtedly infesting coniferous 
trees, are the following: 
Dendroctonus similis Le Conte, Colorado. "A smaller and somewhat more elongate 
form occurs in Canada, Texas, and Colorado, but 1 do not think it capable of being 
separated as a distinct species." 
Dendvoctonus punctatus Le C. New York. 
Dendroctonus simple* Le C. Canada. 
Dendroctonus brevicornis Le C. Middle California. 
Dendroctonus frontalis Zimmerman. Lake Superior to Georgia. 
52. The pine hylubgops. 
Hylurgops pinifex (Fitch). 
(Larva, Plate xxm. rig. 4.^ 
Order Coleoptera : family Scolytid.e. 
"A beetle which closely resembles the preceding, and is frequently 
met with in compauy with it upon pine lumber in mill yards early in 
May, requires to be noticed in this place. I am unable 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 
