150 



Remarks. — I am greatly indebted to Mr. Outram Bangs of the 

 Museum of Comparative Zoology for his generous assistance in 

 the preparation of this paper. All of the specimens described are 

 in the collection of the Museum of Comparative Zoology, except 

 one from Durango, which I examined in the collection of the 

 University of Michigan Museum of Zoology. 



