_Oryzomys aquaticus_ Allen, Bull. Amer. Mus. Nat. Hist.,
3:289, June 30, 1891. (Type from Brownsville, Cameron
County, Texas.)
_Oryzomys couesi aquaticus_ Goldman, N. Amer. Fauna, 43:39,
September 23, 1918.
_Specimens examined_, 2 as follows: 36 km. N and 10 km. W
Ciudad Victoria, 1 km. E El Barretal, on Rio Purificacion,
1; 70 km. [by highway] S Ciudad Victoria and 6 km. W of the
[Pan-American] highway [at El Carrizo], 1.
_Remarks._--The specimens, all immatures, are slightly darker than
topotypes of _O. c. aquaticus_, seemingly tending toward the darker _O.
c. peragrus_ Merriam to the southward. These records of occurrence
extend the known range of this subspecies approximately 210 miles to
the southward and increase the possibility of continuous distribution
between _O. c. aquaticus_ and _O. c. peragrus_.
The male obtained south of Ciudad Victoria was taken on January 12, by
William J. Shaldach, Jr., 200 yards within the tunnel of a mine at an
elevation of approximately 2600 feet. This was in the Sierra Gorda,
which is a part of the Sierra Madre Oriental.
~Oryzomys rostratus rostratus~ Merriam