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 tlvp 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 obsoletus) 

 ■with which it associates, by its much smaller size, which, however, is very variable, 

 and by the much shorter antennae, 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 Rocky Mountain region. 

 It is also said by Le Conte to occur in Russian America (Alaska). 



26. Criocephalus agrestis Kirby. 



(Pupa, PI. XVII, 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 Asemuin 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 nioestum. 



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 G. 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™™ 

 in length; breadth of body, 7^™™. no. '^i^.-onocephaiZs pro. 



Criocephalus productus Le Conte I have taken ductus.— From Packard. 



. y-, 1 1 1 . t-tj. 1 J T 1 • 1 -^ a, the same after Leng. 



in Colorado and in Utah, and I have received it 



from Tacoma, Wash., on the shores of Puget Sound. It undoubtedly 



inhabits pine trees, and represents the Eastern C. agrestis. 



