5l6 SEVENTH KEPORT OF THE FOREST, FISH AND GAME COMMISSION. 



CvYphaliis striaiulns Mann. 



This bark borer was met with in spruce by tlic writer in August, 1900, at Saranac 

 Inn, where it was working in company with Toinicus balsaincus Lee. Tlie affected 

 tree was situated near the water, and its red foliage attracted attention. The trunk 

 exhibited no signs of injur)-, but as this borer was found working almost entirely at 

 the base of the limbs, it was apparently the primary cause of the trouble. This insect 

 was also met with at Floodwood in hemlock, and at Axton in a small balsam tree. 



The adult beetle is about 3/,, of an inch long, and ranges in color from light 

 yellowish-brown to almost black. The prothorax bears a number of prominent chiti- 

 nous tubercles, and the wing covers are faintly striated with rows of fine punctures. 



Tlie operations of this insect, as previously mentioned, appear to be confined 

 very largely to the base of the limbs, particularly on the upper side. The burrows 

 are very irregular and seem to have little plan, consisting as they do, of a series of 

 interlacing galleries, which often unite to form large excavations around the base of 

 the twig. 



Dryocaics Species. 



V ^^^^^^ / -^ species belonging to this genus was met with by the writer 



' " ' August 14, 1900, at Saranac Inn, where it was breeding under 



T spruce bark in company with Polygraplius rufipouiis Kirby. The 

 beetle is about ^ 3, of an inch long, and in the case of the speci- 

 men obtained, a yellowish-brown color. More mature indi- 

 ■ viduals are doubtless much darker. The galleries are larger 

 than those of Polygraplius. 



Wood Borers or Ambrosia Beetles. Several species belong- 

 ing to this most interesting group may be found working in 

 trees previously injured by some earlier mentioned forms. 



FIG. j6. XYLOTERUS 

 POLITUS. 



AFTER HUBBARD, U. S. 

 DRI'T. AGR., DIV. E.»JT. 

 BUL. 7, N. S. 'gy. 



Xylotcnts politits .Say. 



This species is recorded as a common enem\- of deciduous as well as coniferous 

 trees. It was met with by the writer in a fallen beech tree at Floodwood August 

 2 1, 1900. It was also found by him in the stump of a recently fallen soft maple at 

 Axton, and has been recorded by other writers from a number of trees. 



Its black-walled g.dleries with series of brood chambers are quite characteristic, 

 and when present in numbers reduce the value of timber materially. 



Description. This beetle is more slender and a little smaller than Xylotcrus 



