BIBLIOGRAPHICAL REFERENCES. 
The following list gives the titles of some of the publi¬ 
cations in which information will be found regarding 
the original identification of the species of Cecidomyia 
destructor by Thomas Say, and likewise regarding its 
habits, history, and distribution in America and Europe, 
and means of prevention and remedy. The most im¬ 
portant and serviceable of the papers are those of the 
U.S.A. Department of Agriculture, and the papers by 
Dr. B. Wagner :— 
Some account of the insect known as the Hessian Fly. By 
Thomas Say. Journal of Academy of Nat. Sciences, i., pp. 45 - 48, 
1817. 
The Hessian Fly; its ravages, &c. U. S. A. Department of Agri¬ 
culture : Third Report of Entomological Commission. Washington, 
1883. (Reprinted, with additions and corrections, from Bulletin IY. 
of the U.S. Entomological Commission. By A. S. Packard, jun., 
1880). 
The Hessian Fly: its history, &c. By Asa Fitch, M.D. Trans, 
of the New York State Ag. Soc., vi., 1846. Albany, 1847. 
The Hessian Fly not imported from Europe. By Dr. H. A 
Hagen. Canadian Entomologist, 197 - 207, 1880. 
Introduction to Entomology. By W. Kirby and W. Spence. 
1815-26, i. 
Untersuchungen liber die neue getreide gall-mucke. Von Dr. 
Balthasur Wagner. Fulda & Hersfeld. 1861. 
Die neue kornmade. Yon Dr. H. Loew. 1859. 
Naturgeschiclite der schadlichen insecten. Yon V. Kollar. Wien, 
1837. English translation by J. & M. Loudon, with notes by J. 0. 
Westwood. London, 1840. 
Untersuchungen liber Insectenschaden auf den schlesischen 
getreidefeldern m Sommer 1869. Von Prof. Dr. Ferd. Colm. 
Die schadlichen insekten Russlands. Yon. F. T. Koppen. St. 
Petersburg, 1880. 
v Synopsis Cecidomyidarum. Von J. E. Bergenstamm und Paul 
Loew. AVien, 1876. 
^ Die Praktisclie Insekten kunde. Yon Dr. E. L. Taschenberg. 
Bremen, 1880. Pt. iv., pp. 9-14. 
Die Pflanzenfeinde aus der classe der Insekten. Von J. H. 
Kaltenbach. Stuttgart, 1874. Pp. 734-741. 
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