INSECTS AFFECTING PARK AND WOODLAND TREES 343 



that its larvae are common under the thick bark of pine logs and stumps. 

 Dr Fitch notices this insect briefly and evidently considered it one of the 

 common species iTT New York State. Dr Packard records the occurrence 

 of larvae and immature beetles in abundance at Brunswick Me., in the mid- 

 dle of March. Dr A. D. Hopkins states that this insect was very common 

 in West Virginia from 1890-94, when it attacked all the pines and Norway 

 spruce, working near the base of living and dying trees and in stumps. He 

 also observes that it is widely distributed. 



Description. The adult is a rather stout brownish beetle from about 

 3 /i6 to y± inch long. It is probable that in a large series there would be 



Fig. 64 Dendroctonus tere- Fig. 65 Pupa of Den- Fig. 66 Anal plate of Jarva of 



brans (author's illustration) droctonus terebrans Dendroctonus tere- 



(author's illustration) brans (author's illustration) 



considerable range in color, as is the case in many other bark beetles. The 

 jaws are black, the eyes are finely granulated and the head and thorax 

 thickly and somewhat coarsely punctured. The wing or elytra are striated 

 and somewhat coarsely punctured. The general form of the beetle and 

 certain structural details are shown in figure 64. 



The pupa is white, quite stout and about ^ inch long. The lateral 

 edges of the abdominal segments are each provided with a rather stout 

 fleshy spine tipped with a dark chitinous point. A pair of similar spines 

 are found on the last segment and smaller, scattering ones on the dorsal 



