Fes., 1912. MaAmmats or 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 
Y > 
ex (oe 
, 2 
ae v 
C. ¢. carolinensis 
cae C. c. texensis 
oe. es 
ra) area of intergradation 
Map illustrating approximate former distribution of Beaver in eastern United States. 
Castor canadensis Kuni. Type locality — Hudson Bay. Description as previously 
given. 
Castor c. carolinensis Ruoaps. (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 BALEY. (N. Amer. Fauna, No. 25, 1905, p. 122.) Type locality — 
Cummings Creek, Colorado County, Texas. General coloration paler and tail 
narrower. 
