370 



NEW YORK STATE MUSEUM 



Glen House. Mr H. G. Hubbard states that this species is common in 

 coniterous trees from Alaska to Maine and extending southward in the 

 mountainous regions. He adds that it is equally common in northern 

 Europe. 



Description. This is a rather stout, brownish, black beetle, measuring 

 but little over j/g inch in length. The form of the 

 antennae, the sculpturing of the prothorax and the 

 markings on the wing covers are well shown at 

 figure 74. 



The galleries of this species, like those of the fol- 

 lowing, penetrate the wood vertically for some distance 

 and then branch. The brood chambers are arranged 

 at nearly equal distances and extend above and below 

 in a direction parallel with the wood fibers. They are 

 usually farther apart than in the case of X. p o 1 i t u s 

 Say. The walls are stained black as in allied species. 

 Natural enemies. I)r Hopkins has found I p s 

 fasciatus Oliv. associated with this form in spruce 

 logs, and larva, probably of the same species, in its burrows. A predaceous 

 form, Thanerocleris sanguineus Say, was found by I)r Hopkins 

 on a hemlock stump with this borer. He also records an interesting 

 instance where large numbers of this species were taken in the stomachs 

 of brook trout in Randolph \V. \'a. the latter part of May. The insects 

 had evidently been flying in considerable numbers, dropped on the water 

 and fallen a prey to the fish. 



Bibliography 



1897 Hubbard, H. G. U. S. Dep't Agric. Div. Ent. Bui. 7, n. s. p. 28 

 1899 Hopkins, A. D. W. Va. Agric. Exp. Sta. Bui. 56, p. 349, 444 



Fig. 74 Xyloterus bivit 

 t.it us. (After Hubbard, V 

 S. Dep't Agric. Div. Ent 

 Bui. 7, n. s. 1897) 



