INSECTS AFFECTING PARK AND WOODLAND TREES 13 



idae. Several valuahlL' I)iolotj;;ic nnJiioi^raphs trealiiii;- of Lrroups s[jecially 

 injurious to trees have appeared, besides a number of bulletins j,nvinjr 

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

 lowing- are some of the ])rincipal references to this j^roup, particular atten- 

 tion being- given to New York State publications : 

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



P- 5-67- 



1858 Insects Infesting Deciduous Forest Trees. Ins. N. V. 5th Rep't, |). 1-74. 



i8>Si Packard, A. S. Insects Injurious to Forest and Shade Trees. U. S. Ent. Com. 



lUil. 7, ]). 1-J75. 

 1890 Insects Injurious to Forest and Shade Trees. U. S. Ent. Com. 5th Rep't, 



!'■ 1-945- 

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



.\gric. E.\p. Sta. Bui. 31, p. 121-68. 

 1893 Catalogue of West \'irginia Forest and Shade Tree Insects. W. Va, Agric. 



Exp. Sta. liul. 32, p. 17 1-25 I. 



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 America. U. S. Dep't .Agric. 

 I)i\. Ent. Tech. ser. 3, p. 1-135. 



1898 Felt, E. P. Insei ts Injurious to Maple Trees. Forest, Fisli and Game Com. 4th 

 Rep't, 11. 367-95. 



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



P- 35 '-79- 

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



Me.xico. .\m. Mus. Nat. Hist. Mem. 6, j). 217-352. 

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



.\gric. Di\-. Ent. Bui. 28, n. s., p. 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 accomj^anying the 

 development of insects add much to the interest attaching to their stud)-, 

 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 



