10 MEMOIRS OF THE IJfATIONAL ACADEMY OF SCIENCES. 



direftion, and lias seiievously turned over to me all liis notes on transformations, geographical 

 distribution, etc., his contributions very much 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 examining the types of the late Mr. Ileury Edwards, and a few types of 

 Mr. Grote. Other material and types in the Mu.seum of Comparative Zoology at Cambridge, 

 Mass., of the IJoston Society of Natural Tlistory, particularly the Harris collection, and the 

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

 the authorities iu charge I am specially indebted. 1 should also acknowledge the frequent aid 

 rendered by Mr. 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. K. Grote, now of lUemen, Germany. 



Mrs. Annie Trumbull Slosson, of New York, has generously given me valuable material, 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 impoitant collections, 

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

 rendered most etlicieut aid, and lias my hearty thaidcs. We have together made a number of 

 •comparisons, and thus arrived at results which otherwise would have been less certain. 



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

 me several colored drawings of larvse. 



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



Dr. R. Thaxter has permitted me to examine his very valuable collection of larva*, now in 

 the Cambridge Museum, and Professor French, of Carboudale, 111., has also kindly helloed nic 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 Nerlve bidentata. 



I am also indebted to the following entomologists who have aided nie 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; I\Ir. William Beutenmueller, iu charge of the collection of insects 

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

 ill the course of the work. 



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

 obligations. Besides the work nf 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 lidelity in drawing of the artist. 



I have also had ten drawings of Walker's tyi)es in the British Museum, made by Mr. H. 

 Knight, of London, with the permission of Dr. A. Guenther, superintendent of the zodlogical 

 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 Eattou Le Conte, which were loaned me for such a purpose by his sou, 

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

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



Brown University, Providence, R. I. 



'See Scaddor'8 bio^r.aphicnl sk'tnh of .1. L. Le Conte, Trans. A.raer. Eat. Soc, Aug.. 1S84, ]>. 9. 



