little caterpillars known a.s ro.se leaf-tycrs, ro.se gall flies (minute mag- 

 gots, similar to those which attack violets), bud-worms, etc. 



It was found impossible to complete certain of the studies planned and 

 begun in 1898, owing to the scarcity of material (about Washington) 

 the following years, but it is believed advisable not to further delay 

 publication, as it is impossible to foretell when suflicient material will 

 be available for our purposes. 



Since the writer is not a special student of Lepidoptera he has pre 

 ferred to use in the present work the lepidopterous genera in Smith's 

 Catalogue rather than to adopt those recently proposed by certain 

 European systematists, among whom is Sir G. F. Ilampson, who has 

 been for some time engaged upon the Py ralidas. By so doing he believes 

 that a certain degree of unnecessary confusion will be avoided, as it is 

 b}' no means certain that the new genei'ic arrangement of the European 

 lepidopterists will be generally adopted in toto by Americans; and, 

 until this matter has received the attention which is its due on the part 

 of our students of this order, the old genera will be retained. 



Mr. B. T. Galloway, Chief of the Bureau of Plant Industry, has dis- 

 cussed some of the principal insect pests of the violet in a little hand- 

 book, published in 1899, on the subject of growing and marketing 

 violets for profit, and entitled "Commercial Violet Culture." The 

 question of violet insects with the remedies to be employed against 

 them is considered on pages 190-215 of that publication. 



In the present bulletin all of the text figures designated as original 

 have been drawn by Miss Lillie Sullivan, under the writer's j)ersonal 

 supervision, and for the most part from selected fresh material. 



F. H. C. 



