10 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



•direction, and has generously turned o\ er to me all bis notes on transformations, geographical 

 distribution, etc., his contributions very mucli enhancing the value of this work. 



I am also indebted to the authorities of the American Museum of Natural History, New York, 

 for the opportunity of examiTiing the types of the late Mr. Henry Edwards, and a few types of 

 Mr. Grote. Other material and types in the Museum of Comparative Zoology at Caiubridge, 

 Mass., of the Boston Society of Natural History, particularly the Harris collection, and the 

 collection of the American Entomological Society at Philadelphia, have been examined, and to 

 the authorities in charge I am specially indebted. I should also acknowledge the frequent aid 

 rendered by ISIr. Henry Edwards before his death, and the labors of those who have in former 

 years done much pioneer work in collecting and describing the Bombyces, especially of my friend, 

 Mr. Aug. R. Grote, now of Bremen, Germany. 



Mrs. Annie Trumbull Slosson, of New York, has generously given me valuable jnaterial, and 

 given me free access to her collection, and in this and other ways laid me under special obligations. 



Mr. H. G. Dyar and Mr. B. Neumogen have freely shown me their important collections, 

 and generously loaned specimens for illustration and study. Mr. Dyar has in a number of ways 

 rendered most eflicieut aid, and has my hearty thanks. We have together made a number of 

 ■comparisons, and thus arrived at residts which otherwise would have been less certain. 



Dr. J. A. Lintner, State Entomologist of New York, has opened his collection to me, and loaned 

 inc several colored drawings of larva'. 



From Rev. E. D. Hulst, of Brooklyn, I have received by exchange many specimens. 



Dr. 11. Thaxter has permitted me to examine his very valuable collection of larvip, now in 

 the Cambridge Museum, and Professor French, of Carl)ondale, 111., has also kindly heliied me. I 

 am much indebted to Miss Emily L. Morton, of Newburg, N. Y., for eggs, larva-, and the use of 

 several colored drawings of Datana larva^, etc., and for notes on their habits. To Miss Caroline 

 E. Soule also I am under obligations for a tine colored sketch of Nerlcc hidcntata. 



I am also indebted to the following entomologists who have aided me with larva?, eggs, moths, 

 local lists, etc.: Mr. O. S. Westcott, Chicago, 111.; Mr. Tallant, Columbus, Ohio; Mr. Graef, 

 Brooklyn, N. Y.; Mr. Trevor Kincaid, Olympia, Wash.; Mrs. Fernald, Amherst, Mass.: Mr. 

 Charles Palm, of New York; Mr. William Beutenmueller, in charge of the collection of insects 

 in the American Museum of Natural History, New York, and to others whose aid is acknowledged 

 ■ in the course of the work. 



To Mr. Joseph Bridgham, who has made the drawings of the larval stages, I am under special 

 <)bligati(nis. Besides the work of drawing, he has secured many of the larva-, and shown the 

 utmost pleasure in aiding me to the extent of his ability. It is to be hoped that the work of the 

 lithographer will bring out the delicacy of color and fidelity in drawing of the artist. 



I have also had ten drawings of Walkers types in the Britisli Museum, made by Mr. H. 

 Knight, of Loudon, with the permission of Dr. A. Guenther, superintendent of the zoological 

 department, to whom my hearty thinks are due; also for his courtesy in allowing me, with the 

 kind aid of Mr. A. G. Butler, assistant in entomology, to examine some of Walker's types. 



I have also had copied in the plates a number of excellent colored drawings of caterpillars, 

 made by the late Maj. John Eatton Le Conte, which were loaned me for such a purpose by his son. 

 Dr. John Lawrence Le Conte, a few years before his death. They were made in Georgia, presuma- 

 bly at Sans Souci, on the Ogeechee River, about 10 miles south of Savannah.' 



Brown University, Providence, I!. I. 



'See Scudder's biographical sliotcli of .T. L. Le Conte, Trans. Ainer. Ent. Soc, Aug., 1884, p. 9. 



