NATURAL SCIENCES OF PHILADELPHIA. 



85 



an individual nature; and this stand-point is well borne out by the 

 results of careful measurements of specimens from various locali- 

 ties in North America. The following table of measurements 

 shows conclusively that the variations in general size, and rela- 

 tive proportions of the parts, are purely individual. 



Measurements of 39 Specimens of Nisus Cooperi,from various 

 portions of North America. 



Winir. 



Tail 



Cai- 

 rn en. 



Tarsus 



Middle 

 Toe. 



Cat. No 



Museum. 



Locality. 



Adult Males. 



Nat. Mas. 



R. R. 

 Nat. Mus. 



it 



tc 



Aiken 

 Lawrence 



tt 



Washington, D. C. 



Massachusetts. 

 Sacramento Val., Cal. 

 Fort Tejon, Cal. 

 Mirador, Mexico. 



tt tt 



Puget Sound. 

 El Paso, Col. 

 New York. 



Adult Females. 



