North American Fauna 



This publication series includes monographs and other reports of 

 scientific investigations relating to birds, mammals, reptiles, and 

 amphibians, for professional readers. It is a continuation by the Fish and 

 WUdlife Service of the series begun in 1889 by the Division of Ornithology 

 and Mammalogy (Department of Agriculture) and continued by 

 succeeding bureaus—Biological Survey and the Bureau of Sport Fisheries 

 and Wildlife. The Service distributes these reports to official agencies, to 

 libraries, and to researchers in fields related to the Service's work. 



Copies of this publication may be obtained from the Publications Unit, U.S. 

 Fish and Wildlife Service, 1849 C Street, N.W., MaU Stop 130-ARLSQ, 

 Washington, DC 20240, or may be purchased from the National Technical 

 Information Service (NTIS), 5285 Port Royal Road, Springfield, VA 22161. 



ISSN 007-1304 



