MONOGRAPHS OF THE 

 AMERICAN SOCIETY OF MAMMALOGISTS 



These monographs are a series of publications 

 similar in character to articles published in The 

 Journal of Mammalogy, but not suitable for 

 periodical publication because of their length or 

 for other reasons. 



The plans for this Series are broad and compre- 

 hensive, and contemplate the publication of 

 works covering all phases of technical and popular 

 Mammalogy. 



The Monographs and The Journal of Mammalogy 

 are issued under the auspices of the American 

 Society of Mammalogists. 



Information regarding these monographs may be 

 obtained from the Secretary of the American 

 Society of Mammalogists, A. Brazier Howell, U. 

 S. National Museum, Washington, D. C, or the 

 Publishers, The Williams & Wilkins Company, 

 Baltimore, U. S. A. 



This series is edited by Hartley H. T. Jackson, 

 Bureau of Biological Survey, Washington, D. C. 

 Edward A. Preble, Ethel M. Johnson and Emma 

 M. Charters assisted in editing Monograph 3. 



