PINE BORERS. 699 
metathorax, the joints composing it being much shorter than in the other species. 
It may also be recognized by the two raised longitudinal lines on the wing-covers 
corresponding to those on the wing-covers of the beetle ; the wing-covers extend to 
near the middle of the second abdominal segment, and the tips of the hind legs reach 
nearly to the posterior edge of the third abdominal segment. The end of the abdo- 
men is square, and ends in two sharp, slender incurved hooks, which are dark red at 
tip. Length, .44 inch. 
The beetle differs from two larger common beetles ( Criocephalus agrestis and ohsoletus) 
with which it associates, by its much smaller size, which, however, is very variable, 
and by the much shorter antenna}, the joints being much shorter and thicker and 
more coarsely pitted than in the two species above named. It is brown-black, with 
a rounded, flattened prothorax, and two longitudinal ridges along the wing-covers. 
I have taken this beetle at Nederland, in Colorado, June 30 ; it 
undoubtedly preys upon coniferous trees in the Kocky Mountain region. 
It is also said by Le Conte to occur in Russian America (Alaska). 
26. Criocephalus agi-estis Kirby. 
(Pupa, PL xvn, fig. 3, 3a.) 
Boring into pines from Maine to Colorado and the Pacific coast, a rather large white 
longicorn larva; assuming the pupa state in May and the beetle state in June and 
July. 
This large beetle closely resembles Asemum moestum, but is about 
twice as large, with much longer and slenderer antennae; it is also 
characterized by the three large irregular pits on the top of the pro- 
thorax ; these pits are also seen in the pupa, and by them the pupa 
noted below was identified as belonging .to this species. In color and 
the two high ridges on each wing- cover it closely resembles the more 
abundant Asemum moestum. 
I found what I regard as the pupa of this species under the bark of 
the pitch-pine at Providence, May 20, 1881. From its close resemblance 
to the pupa of Asemum moestum, from the form of the prothorax and 
the three pits which correspond so closely to the beetle, I do not doubt 
but that the pupa should be referred to C. agrestis. 
The antennae of the pupa are long and reach to 
the basal sixth of the wing-covers ; they thence re- 
curve, so that the tip touches the basal third of the 
fore tibiae. The end of the abdomen has two spines, 
much as in the pupa of Asemum moestum; the wing- 
covers have each two longitudinal parallel straight 
raised lines, while the body in general is flat and 
rather broad, as in the beetle. The pupa is 25 mm 
in length; breadth of body, 7£ mm . FlG . 235.-^0^0^^0- 
Criocephalus productus Le Conte I have taken duett**— From Packard. 
in Colorado and in Utah, and I have received it a ' the 8ame after Leng ' 
from Tacoma, Wash., on the shores of Puget Sound. It undoubtedly 
inhabits pine trees, and represents the Eastern C. agrestis. 
