X. COMPARATIVE MEASUREMENTS* 



OP ADULT SKULLS OP CERTAIN AMERICAN SPECIES OP BEAVER 

 (All measurements in millimeters) 



■2« 



number Sex SUBSPECIES — GENERAL LOCALITY M 



16383 $ Castor subauratus subauratus (San Joaquin Valley, Calif.) 120.1 



8988 $ Castor subauratus subauratus (San Joaquin Valley, Calif.) 119.8 



12654 $ Castor subauratus subauratus (San Joaquin Valley, Calif.) 126.3 



12101 S Castor canadensis leucodonta (Vancouver Id., B. C.) 111.9 



12111 $ Castor canadensis leucodonta (Vancouver Id., B. C.) 110.9 



12107 2 Castor canadensis leucodonta (Vancouver Id., B. C.) 122.7 



4220 $ Castor canadensis belugae (Cook Inlet Region, Alaska) 118.0 



4347 $ Castor canadensis belugae (Cook Inlet Region, Alaska) 109.0 



4225 $ Castor canadensis belugae (Cook Inlet Region, Alaska) 122.5 



210 $ Castor canadensis phaeus (Admiralty Id., Alaska) H7.6 



209 $ Castor canadensis phaeus (Admiralty Id., Alaska) 114.7 



60354 $ Castor canadensis frondator (Colorado River, Mex.) 118.7 



35946 9 i Castor canadensis frondator (San Pedro River, Mex.) 111.7 



174525 3 Castor canadensis canadensis (New Brunswick, Canada).... 117.6 



174526 $ Castor canadensis canadensis (New Brunswick, Canada).... 115.2 



18525 $ Castor canadensis michiganensis (Michigan) 111.4 



18526 $ Castor canadensis michiganensis (Michigan) 111.5 



18527 $ Castor canadensis michiganensis (Michigan) 108.5 



*For manner of taking measurements see Taylor, 1911, pp. 206, 207, and table opp 



