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 Mammal- 

 ogy are issued under the auspices of the 

 American Society of Mammal ogists. 



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 Com- 

 pany, Baltimore, U. S. A. 



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

 Bureau of Biological Survey, Washington, D. C. 



