176 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



shire County have been prepared by editing the excellent keys in 

 Gray's Manual, seventh edition. 



It remains for the writer to express his sincere thanks to those who 

 have generously helped in the preparation of the list both in the field 

 and in the study. The assistance freely given by Prof. M. L. Fernald 

 in the early years of the undertaking was of the greatest service to the 

 writer. Dr. Harold St. John has kindly read the manuscript and has 

 helped with many difficulties. Mr. C. A. Weatherby has generously 

 given aid and advice. Mrs. Agnes Chase, Mr. W. W. Eggleston, 

 Mr. F. F. Forbes, Mr. F. Tracy Hubbard, Mr. Bayard Long, Mr. K. K. 

 Mackenzie, and Prof. K. M. Wiegand have very kindly aided in 

 determining difficult species. Dr. B. L. Robinson and Miss M. Day 

 have been frequently consulted. Without the keen eyes and industry 

 of Mr. F. Walters and Judge J. R. Churchill the list would be poorer 

 by a number of species. Mr. Walters has also been of great help in 

 the study of Dewey's and Eaton's nomenclatiu'e. The map of Berk- 

 shire County has been kindly drawn by Mr. H. Harris. The writer 

 wishes to take this opportunity to express his gratitude to Mr. and 

 Mrs. Bernhard Hoffmann for the constant interest which they have 

 shown in the preparation of the list. 



