REPORT OF THE STATE ENTOMOLOGIST I913 29 



Distribution. This species occurs throughout the middle and 

 northern part of the United States, being very abundant about 

 Lake Superior, according to Le Conte. It has been taken by 

 Mrs Slosson on Mount Washington and appears to be prevalent 

 in the Appalachian region. 



Parasites. The material obtained from New York, as noted 

 above, produced a considerable number of parasites, by far the 

 most abundant being Odontaulacus bilobatus Prov., the 

 exposed pupae of which may be found in small cells within the 

 bark. The light brown, narrowly oval, papery cocoons about one- 

 half an inch long, ofBracon pectinator Say, were found 

 singly or in clusters in the galleries of this insect and the adult 

 reared. A third parasite, Spathius trifasciatus Riley, 

 was also obtained. The borings of this beetle were inhabited by 

 the pinkish larvae of a gall midge, Camptomyia tsugae 

 Felt. This latter species occurred in some numbers and probably 

 subsists upon the dead or decaying woody tissues. Aulacus 

 abdominalis Cress., Bracon pectinator Say and 

 Eupelmus cleri Ashm. have been reared by Doctor Hopkins 

 from wood infested by this borer. He also took upon the infested 

 bark, specimens ofXylonomus insularis Cress. 



Control measures. The most effective method of checking this 

 borer under ordinary conditions is to cut out all dead or sickly 

 trees and burn the thicker bark, at least, during winter or early 

 spring. Hemlocks injured by fire or wind storms, after April ist, 

 may well be left as trap trees and removed the following winter. 



Bibliography 



1841 Harris, T. W. Treatise Ins. N. E., p. 44 (Buprestis) (3d ed., p. 50). 



1881 Packard, A. S. U. S. Ent. Comm., Bui. 7, p. 150. 



1883 U. S. Ent. Comm., 3d Rep't, p. 253-55 (Melanophila 



species). 



1890 U. S. Ent. Comm., 5th Rep't, p. 684. 



1893 Hopkins, A. D. W. Va. Agric. Exp't Sta. Bui. 32, p. 182, 216, 218, 

 219, 225. 



1898 '■ See. Prom. Agric. Sci. Proc, p. 105. 



1899 W. Va. Agric. Exp't Sta. Bui. 56, p. 255, 429. 



1904 U. S. Dep't Agric, Div. Ent. Bui. 48, p. 38. 



1904 Felt, E. P. N. Y. State Mus. Bui. 76, p. 171-72. 



1906 N. Y. State Mus. Mem. 8, 2:339, 390-91. 



1909 Smith, J. B. Ins. N. J., p. 292. 



1909 Burke, H. E. U. S. Dep't Agric. Year Book, p. 405-6. 



