INSECTS AFFECTING PARK AND WOODLAND TREES 





that its larvae arc common under the thick l)ark of pine logs and stumps. 

 Dr I'itch notices this insect brirtly and evidently considered it one of the 

 commiin species in New \'ork State. Dr Packard records the (jccurrence 

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

 dle of March. I )r y\. 1). 1 lopkins states that this insect was very common 

 in West \ ir^inia from 1890-94, when it attacked all the jjines and Norway 

 spruce, working near the base of li\ing antl dying trees and in stumps. lie 

 also observes that it is widel)- distributetl. 



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

 3/16 to ^4 inch long. It is [jrobable that in a large series there would be 



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Fiff. 64 Dcndroctonus tere- 

 brans (author's illustration) 



Fig. 65 Pupa of Dcn- 

 droctonus t c r c b r a n <i 

 (authur's ilhistration) 



Fii;. 66 Anal plaic «t larva of 



I> c n d r o c t n n II s tere- 

 brans (aiitliur's illustration) 



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

 jaws are black, the eyes are fmely granulated and the head and tliora.x 

 thickly and somewhat coarsel)- punctured. The wing or ehtra are striated 

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

 certain structural details are shown in figure 64. 



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

 edges of the alxlominal 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 



