1913. _Castor canadensis mexicanus_ V. Bailey, Proc. Biol.
Soc. Washington, 26:191, October 23, type from Ruidoso
Creek, 6 mi. below Ruidoso, Lincoln Co., New Mexico.
_Distribution in Tamaulipas._--Probably in the Rio Grande
drainage.
The beaver has been reported in Tamaulipas only from Matamoros (Baird,
1858:355--three specimens) and from 12 miles below, south of, Matamoros
(V. Bailey, 1905:124). In Tamaulipas the beaver may occur only in the
Rio Grande drainage.
=Oryzomys palustris=