490 SEVENTH REPORT OF THE FOREST, FISH AND GAME CGMMISSIOX. 



He states that a long slender cylindrical gallery is formed, which is excavated about 

 equally in the outer surface of the wood and in the inner laj-ers of the bark. In 

 some cases two, three or even six galleries may originate from one point, running in 

 opposite directions, but always lengthwise with the tree or limb. Little notches 

 are excavated at intervals in the adult galleries while the work is in progress, one 

 to four eggs being placed in each notch. The gnav.ings of the beetles are left 

 strewn in the bark behind them and as they travel backward and forward in the 

 burrow from time to time, the little stiff hairs with which their bodies are- provided 

 serve as a brush to sweep this dust into the egg notches, as stated by Dr. Fitch. 

 • Thus the mouths of the egg notches are filled and the eggs therein covered and 

 concealed. The female forms a burrow from four to eight inches or more 

 in length. 



Lt/e History. Dr. Fitch states that the eggs probably hatch in !o to 20 days 

 according to the .empcraturc. The young grub is found lying with its back 

 towards the sawdust with which the cavity in which the egg is laid was filled, its 

 head thus being close to the soft innermost layer of bark at the extremitv of the 

 notch. This cavity is continued by the larva to a distance of from i to 3 inches at 

 appro.ximately right angles to the main boring. The galleries increase in size with 

 the development of the grubs and those not overtaken by disaster excavate oval 

 cells in which the transformations to the adult take place. 



Natural Enemies. This species is subject to attack by a number of natural 

 enemies. The writer has taken Thanasiinits dubius Fabr. in the burrows of this 

 bark borer, where it was associated with Toiiiicns calligraplius Germ. This preda- 

 cious beetle is undoubtedly one of the most efficient natural checks on bark borers. 

 Another small beetle, Histcr parallclus Say, was also found by the writer in the 

 galleries of this bark borer. 



Pityogenes Species. 



This is a very small species, only ><, of an inch in lengtli, and was met with by 

 the writer August 5, igoo, at Slingerlands, N. Y., where it had been working in 

 recently cut pine limbs. Larvae and pupae were present and the beetles had 

 evidently commenced operations recently. This species was associated with 

 Tomiciis cacograplius Lee, and a species of Hypophloats was found in its galleries. 

 This bark borer was also met with by the writer in limbs of a dying white pine at 

 Saranac Lm, August 19, 1900, where all stages were present, and though the tree 

 was not badly infested, this borer may have had a hand in its death, as its operations 

 extended over the entire lencfth of the tree. In this instance it was associated with 



