104 



Forty-first Report on the State Museum. 



Scudder: in Canad. Entomol., xviii, 1886, pp. 195-6 (its galleries). 



Smith: in Entomolog. Amer., ii, 1886, p. 127 (food-plants). 



Bedel: in Ann. Soc. Ent. France — Faune Coleop. Bass. Seine, vi, 1888, p. 



406 (literature and European distribution). 

 ScHWARz: in Proc. Ent. Soc. Wash., ii, 1888, p. 30 (hickory .species of 

 Hamilton different). 



A Fruit Tree Bark-borer. 



This destructive bark-boring beetle, whicli, since its introduction in 

 this country a few years ago, has made fatal attack on our three 

 princij^al stone fruit trees, has recently, in accordance with its known 

 European habit, extended its range of operations to apple trees, of 

 which, judging from pieces of the infested wood received from Mr. C. 

 H. Hedges, of Charlottesville, Va., it has already become a serious 

 pest. This is the first instance, it is believed, that its occuri^ence in 

 apple trees has been recognized in the United States. 



From some pieces of apple twigs and branches, and perhaj^s trunk 

 sections of young trees sent to me in the early winter, about a hun- 

 dred examples of the beetle were given out during late winter and 

 early spring. They were taken at intervals from the box containing 

 the wood, as follows: On February 23, 1887, 5 examples; on Feb. 25, 

 13 examp.; on March 3, 16; March 7, 22; March 22, 32; April 4, 10; 

 and on Ajiril 23, 1, and the last — 99 in all. 



The Larval Burrows, 

 Removal of the bark from portions of the apple-tree received, showed 

 the sapwood to be furrowed over most of its 

 surface by the burrows of the beetle, some- 

 times joining or overlapping so that they 

 could not be sepai-ately traced. "When occurring 

 in the smaller trunks they had apparently 

 commenced in the branches and had extended 

 downward, very gradually increasing in width — - 

 at their widest part at the entrance to the 

 hole sunk in the wood for j)upation, measuring 

 one-twentieth of an inch. The extent of the 

 longest burrows observed, was apparently two 

 inches; they were so interconnected that no 

 positive measurement could be made. Their 

 general direction was perpendicular to the 

 trunk, but in some instances, for short dis- 

 tances, they ran in a transverse or oblique 



direction. Figure 41, is from a section of a 



Fig. 41 — Buriowsot ScoLi- " • i <■ tvt 



Tus KUGULosus, beneath the trunk of a young tree received from Mr. 

 back of a young apple-tree. Hedges as above stated. 



