224 



FORTY-FJRST REPORT ON THE StATE MuSEUM. 



Scuddek: in Canad. Entomol., sviii, 1886, pp. 195-6 (its galleries). 



Smith: in Erltomolog. 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). 

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

 Hamilton different). 



A Fruit Tree Bark-borer. 



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

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

 principal stone fruit trees, has recently, in accordance with its known 

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

 which, judging from j)ieces of the infested wood received from Mr. C. 

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

 pest. This is the ii]-st instance, it is believed, that its occurrence in 

 apple trees has been recognized in the United States. 



From some pieces of apple twigs and branches, and perhaps trunk 

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

 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 April 23, 1, and the last — 99 in all. 



The Larval Burrows. 

 Eemoval of the bark from jDortions 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 overlapjDing so that they 

 could not be separately 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 pupation, 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. Fig'ure 41, is from a section of a 

 Fig. 41.— Burrows of ScoLY- ^ • t <• -n/r 



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

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



