BEUTENMULLER, MONOGRAPH OF THE SESIID^E. 219 



to American Economic Entomology,' published by the United States Department 

 of Agriculture, by Messrs. Henshaw and Banks ; a number of titles have also 

 been taken from other sources. 



The titles have been arranged chronologically, and an attempt has been 

 made to bring the subject down to the end of the year 1899, and it is as com- 

 plete as I can make it at present. I am fully aware that many titles are yet to 

 be added, and I would be glad to have my attention called to any errors or 

 omissions. 



Finally, it becomes my great pleasure to express my obligations to many 

 friends and correspondents for the generous aid they have given in the prepara- 

 tion of this memoir. To Prof. J. H. Comstock, of Cornell University, I am 

 indebted for the notes on the venation, and to Dr. H. G. Dyar, of the United 

 States National Museum, for the specific characters and descriptions of the larvae. 

 To Prof. W. B. Barrows for the loan of the types in the Tepper collection in the 

 Agricultural College of Michigan, and to Dr. L. O. Howard and Dr. H. G. Dyar 

 for the loan of the types and material in the collection of the United States 

 National Museum. To Mr. S. Henshaw for the loan of Harris's types in the 

 Boston Society of Natural History and for material from the Museum of Com- 

 parative Zoology. Mr. Jacob Doll has kindly placed at my disposal the types in 

 the Neumoegen collection. For notes and loan of specimens I am also under 

 obligation to the following entomologists : Mrs. A. T. Slosson for the presentation 

 of the types of Sesia seminole and S. marica, and other Florida material ; Prof. 

 Otto Lugger, St. Anthony Park, Minn. ; Prof. D. S. Kellicott, Columbus, Ohio ; 

 Prof. F. H. Hillman, Reno, Nev. ; Dr. H. H. Behr, San Francisco, Cal. ; 

 Messrs. L. H. Joutel, Chas. Palm, and Rev. J. L. Zabriskie, New York ; Prof. F. 

 M. Webster, Wooster, Ohio ; Prof. S. A. Forbes, Champaign, 111. ; Messrs. R. W. 

 Doane, Pullman, Wash. ; E. E. Bogue, Stillwater, Oklahoma ; James Fletcher, 

 Ottawa, Canada; M. V. Slingerland, Ithaca, N. Y. ; A. D. Hopkins, Blacksburg, 

 W. Va.; Prof. J. B. Smith, New Brunswick, N. J. ; Mr. C. W. Johnson and Dr. 

 Henry Skinner, Philadelphia, Pa. ; Prof. C. M. Weed, Durham, N. H. ; Sir 

 George F. Hampson for colored sketches of Walker's types in the British 

 Museum ; Messrs. G. W. Browning, Salt Lake, Utah ; C. P. Gillette, Fort Col- 

 lins, Col. ; Trevor Kincaid, Seattle, Wash. ; E. P. Felt, Albany, N. Y. ; George 

 H. Hudson, Plattsburg, N. Y. ; and Dr. William Barnes, Decatur, 111. 



The excellent colored drawings for Plates XXIX-XXXII inclusive were 

 made by Mr. L. H. Joutel, and Plate XXXIII by Miss Edna L. Hyatt. Plates 

 XXXIV-XXXVI and the figures in the text were drawn by Miss Marion T. 

 Meagher. 



Position of the Family. 



This family of moths was left in peace for over a century at the head of the 

 Heterocera, but has received a varied treatment of late years, having been 



