INSECTS INJURIOUS RO THE PINE. ad By 
unequal size. The dorsal line of the prothorax is sometimes narrow 
and elevated, sometimes obsolete. Length 6™™ (.24 inch). The dis- 
_tinetive characters given by Lecoute are these: prothorax punctured, 
with smaller punctures 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 two species of Dendroctonus, and undoubtedly infest- 
ing coniferous trees, are the following: 
Dendroc'onus similis Leconte, 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.” 
Dendroctonus punctatus Lec. New York. 
Dendroctonus simplex Lee. Canada. 
Dendroctonus brevicornis Lec. Middle California. 
Dendroctonus frontalis Zimmerman. Lake Superior to Georgia. 
43. THE PINE HYLASTES. 
° Hylurgops pinifex Fitch. 
Order COLEOPTERA; family SCOLYTID#. 
A beetle which closely resembles the preceding, and is frequently met with in com- 
pany with it upon pine lumber in mill yards early in May, requiresto be noticed in 
this place. Iam unable to findany description of this species, although it is so com- 
mon it can scarcely have been overlooked by authors till this time. Itis the Hylastes 
pinifex, or the pine-destroying Hylastes of my cabinet. Its habits are doubtless very 
similar to those of the boring Hylurgus, but the beetle is always slightly smaller , 
measuring 0.20 in length, and is darker colored, being deep chestnut red or sometimes 
black, tinged with chestnut. It moreover is destitute of the hairiness of that species, 
having only a thin fine short beard on the hind part of its wing-covers. Its thorax 
and wing-covers have the same sculpture with that. Its head shows no line along the 
middle, except upon the upper lip, where is a slender short elevated one, which ends 
before it reaches a slight transverse depression which crosses the lower part of the 
face. Its body beneath is black, the legs dark chestnut, with the thighs commonly 
black. It moreover differs generically from the preceding in having seven, instead 
of but four, small joints inits antenn, between the long club-shaped basal joint and 
the knob at the tip, which knob is shaped like an egg, and is divided by transverse lines 
into four short joints. Its shanks also have only fine denticulations along their outer 
edge near the tip, in place of the coarse saw-like teeth, which are seen in the forego- 
ing insect. It thus pertains to the genus Hylastes of Erichson. (Fitch.) 
I have found several beetles of this species (identified by Dr. Horn) 
under the bark of a white pine stump, at Brunswick, Me., August 
15-20, 1881. The tree was felled in November, 1880. The beetles had 
evidently recently transformed from the pupa state, as they were with 
one exception pale red, the color of the fully mature beetle being black- 
brown. 
44. THE COAL-BLACK HYLASTES. 
Hylastes porculus Er. (carbonarius Fitch), 
A beetle so closely like the preceding that it merits to be noticed in connection 
therewith is the Hylastes carbonarius of my cabinet. It is 0.20 long, of a pure black 
color, except its feet and antennz, which are chestnut red. Its face shows no trans- 
verse depression inferiorly, but has an elevated line along the middle, reaching a third 
12 RIL 
