^S2 



XEV. VUKK STATE ML'SEUM 



brown insect uljout 



this species has been estimated by various correspondents at lo, 50 and 



e\'en as niucli as gc,'. 



Description. The parent beetle is a small, rather thick, li^ht or tlark 



, incli in length. It presents no distincti\e character 



which will ena])le its separation fr(.>m allic/s, and it is 



more easily ich-ntihed b)' its work, as no other 



insect of its size causes so much injur\- to spruce. 



The middle tibia is illustrated at hi^-ure 85/^. 



1/ ''.Ty Its attack is limited, as observed bv Professor 



'^ r</W, Peck, mostly to the larger trees, it rarelv Ijeing 



\° I'P ^ founel in those less than 10 inches in diameter. 



The most characteristic feature of injurx' is the 



jrt)wned tops, and an examination of tlu; trunk usu- 



all\- results in findiuL;- tubes of pitch, which are 



pushed out from the wounds made by the beetles 



\vhen excavatin^f- an entrance. The atlult galleries 



are about 'x inch in diameter and run longitudi- 



nallv for a distance of several inches, e^'es beino- 



laid on (.-ither side and the lar\ae workiuL; more or less obli([uel\- and very 



irrt-L;ularly Irom this central yaller)' | pi. 61, tig. 1]. Their ])urrows are 



easily recognized by their irregular, more or less tortuous course and 



ex[>aniling character. Adult galleries preserved by inhltrated jjitch are 



shown at |)late 61, figure 2. These illustrations are specially \'aluable as 



they represent material taken l)y Professor Peck some 30 years ago. 



The following more detailed account of this insect's work by Professor 



l\-ck, will also pro\'e of ser\'ice. 



b'or the purpose- of gaining more knowledge of the insect, I cut down 

 at South bond, a tree that had recently been attacked by it. It was about 

 20 inches in diameter at the base ; the foliage was still fresh and green, and 

 there was nothing, excejit the perforations in the bark, to indicate that it 

 was at all allected. 'Phe bark peeletl from the trunk without much diffi- 

 culty, the sajnvood was perfectly sound, and the heartwood also, except a 

 small portion in which there was a slight appearance of incipient decay. 

 Longitudinal furrows, varying from one to six inches in length, were found 



Fig. 85 Middle titii.-ie: a—Fo]y- 

 g r a p h u s r ii f i p e n ii i s ; /' - 

 D e n d r o c t n n u s pice ;i- 

 p e r d a (nriein.il I 



