372 NEW YORK STATE MUSEUM 



adds that it is widely distributed; A small beetle, Hister parallelus 

 Say occurs in the burrows of this insect and may possibly prey on it. The 

 presence of this borer, as well as that of some others, may frequently be 

 detected by the small piles of white sawdust on the bark or at the base of 

 infested trees. 



Description. This beetle is a rather slender, cylindric, brownish black 

 insect, about x /% inch long, and with yellowish legs. The globular antenna! 

 club, the puncturing of the thorax, and the linear dotting of the wing covers 

 are well shown in figure 75. The structure of the antennae is represented 

 on plate 67, figure 4, and that of the middle tibia at figure 78a. 



The burrows of this- beetle extend into the wood vertically for a 

 short distance, in a specimen at hand less than l / 2 an inch. This main 

 gallery has several branches diverging in a direction approximately par- 

 allel with the lines of growth, each of which leads into a series of vertical 

 brood chambers. The illustration is typical of the complex system of 

 galleries. 



Bibliography 



1858 Fitch, Asa. Ins. N. Y. 4th Rep't 1857, p. 40-42 



1890 Packard, A. S. U. S. Ent. Com. 5th Rep't, p. 718-20 



1897 Hubbard, H. G. U. S. Dep't Agric. Div. Ent. Bui. 7, n. s. p. 30 



1899 Hopkins, A. D. W. Va. Agric. Exp. Sta. Bui. 56, p. 344, 346, 347, 434, 442 



1903 Felt, E. P. For. Fish & Game Com. 7th Rep't, p. 495-96 



Pityophthorus sp. 



An insect belonging to this genus was met with by the writer Aug. 

 22, 1900, at Axton, where it was working in small numbers under the 

 bark of a young dying white pine. The central chamber of this species is 

 somewhat circular and in the specimen figured has four primary galleries 

 with a short fifth. The primary or egg galleries run longitudinally or 

 obliquely to the wood fibers and cut into the wood a considerable propor- 

 tion of their depth. The larval galleries are somewhat tortuous, expand 

 very gradually, and also cut the sapwood for about ]4 their depth, and 

 toward the extremities a greater proportion lies in the wood [fig. 77]. 



