INSECTS AFFECTING PARK AND WOODLAND TREES 1$ 



idae. Several valuable biologic monographs treating of groups specially 

 injurious to trees have appeared, besides a number of bulletins giving 

 accounts of from one to several insects attacking various trees. The fol- 

 lowing are some of the principal references to this group, particular atten- 

 tion being given to New York .State publications: 

 1857 Fitch, Asa. Inserts Infesting Evergreen Forest Trees. Ins. N. Y. 4th Rep't, 



P- 5-67. . 



1858 Insects Infesting Deciduous Forest Trees. Ins. X. \ . 5th Rep t, ]>. 1-74. 



18S1 Packard, A. S. Insects Injurious to Forest and Shade Trees. U. S. Rnt. Com. 



IJul. 7, p. 1-275- 

 ,8^0 Insects Injurious to Forest and Shade Trees. U. S. Ent. Com. 5tli Rep't, 



P- 1-945- 

 1893 Hopkins, A. D. Catalogue of West Virginia Scolytidae and their Enemies. W. Va. 



.\gric. E.xp. Sta. Bui. 31, \'. 121-68. 



i8g3 Catalogue of West Virginia Forest and Shade Tree Insects. W. Va. .\gric. 



Exp. Sta. Bui. 32, 11. 171-251. 



1895 Packard, A. S. First Memoir on the Bombycine Moths. Nat. .\cad. Sci. 7: 



291. 



1896 Marlatt, C. L. Revision of the Nematinae of North .\merica. U. S. Dep't .-\gric. 



Div. Ent. Tec h. ser. 3, )). i-i35- 

 1898 Felt, E. P. Insects Injurious to ^Staple Trees. Forest, Fish and Game Com. 4th 



Rep't, p. 367-95- 

 1899 Insects Injurious to Elm Trees. Forest, Fish and Game Com. 5th Rep't, 



1901 Beutenmuller, William. Monograph of the Sesiidae of America North of 



Mexi(c). Am. .\Ius. Nat. Hist. Mem. 6. p. 217-352. 

 1901 Hopkins, A. D. Insect Enemies of tlie Spruce in the Northeast. U. S. Dep't 



.\gri( . Div. Ent. liul. 28, n. s., ]). 1-48. 

 1903 Felt, E. P. Insects Affecting Forest Trees. Forest, Fish and Game Com. 7th 



Rep't, p. 479-534- 

 Transformations of insects. The wonderful changes accompanying the 

 development of insects add much to the interest attaching to their study, 

 and the great diversity between the different stages renders recognition of a 

 species in its various forms exceedingly difficult. The transformations of 

 insects are of interest not only to the biologist, but also to the economic 



