Feb., 1912. Mammals of Illinois and Wisconsin — Cory. 169 



channel twenty-five feet long and a foot or more wide was excavated 

 in the bed of the river far enough out to carry them into deep water. 

 The materials were thrown up in an embankment on the side below the 

 excavation, apparently lest the currents of the stream should carry 

 them back into the channel. The excavation- and the embankment, 

 which were plainly to be seen side by side, the latter in places coming 

 to the surface of the water, presented another striking illustration of 



\ 'Area of Interttrai 



Area of Intergradatlon 



Map illustrating approximate former distribution of Beaver in eastern United States. 



Castor canadensis Kuhl. Type locality — Hudson Bay. Description as previously 

 given. 



Castor c. carolinensis Rhoads. (Trans, Amer. Philos. Soc, N. Ser., XIX, 1898, p. 



420.) Type locality — Dan River near Danbury, Stokes Co., North Carolina. 



Very similar to canadensis, but somewhat larger and the tail broader. 

 Castor c. texensis Bailey. (N. Amer. Fauna, No. 25, 1905, p. 122.) Type locality — 



Cummings Creek, Colorado County, Texas. General coloration paler and tail 



narrower. 



