INSECTS AFFECTING PARK AND WOODLAND TREES 



673 



Dryocoetes sp. 



A species belonging to this genus was met with by the writer Aug. 14, 

 1900, at Saranac Inn, where it was breeding under spruce bark in company 

 with the spruce bark borer, Polvgraphus rufipennis Kirby. The 

 beetle is about 3/ 32 inch long, and m the case of the specimen obtained, of a 

 yellowish brown color. It is doubtless much darker in mature individuals 

 and its galleries are larger than those of Polygraphus. 



Cryphalus striatulus Mann. 



A small, yellowish brown to almost black bark beetle occurs in spruce bark, working 

 particularly at the base of limbs. 



This species was taken by us, working in spruce bark in association 

 with Tomicus balsameus Lec. The affected tree was near water 

 and was noticeable because of its red foliage. The 

 trunk was not injured though this borer was work- 

 ing in some numbers at the base of the limbs and f\|i 

 appeared to be the primary cause of the trouble. This 

 species was taken in August, working at the base of a 



small hemlock limb, the foliage of which had begun to Fig. 200 Middle tibiae: «=.cry- 



1 « phalus striatulus; ^ = Pity- 



turn brown. It was also observed at work in a small ophth ems minutissimus, 



...... , , e=P. p u b e r u 1 u s; d=V h 1 o e o- 



balsam tree, which had been cut several months. tribus frontalis (original) 



The adult is a light yellowish brown to almost black beetle about ?/ 32 

 inch long. The prothorax bears a number of prominent chitinous tubercles 

 and the wing covers are faintly striated with rows of fine punctures. The 

 galleries of this species are very irregular and appear to have no plan, 

 consisting, as they do, of a series of interlacing burrows, which often unite 

 to form large excavations around the base of a twig. 



