Distribution in Tamaulipas.—From Ciudad Victoria northward.
Only a young female was examined; she weighed 22 grams and extends the known range 59 miles eastward from Ciudad Victoria.
Record of occurrence.—One specimen examined from Soto la Marina, 500 ft.
Additional records (Hollister, 1914:253): Camargo; Reynosa; [Cd.] Victoria.
Onychomys torridus subrufus Hollister
Southern Grasshopper Mouse
1914. Onychomys torridus subrufus Hollister, Proc. U. S. Nat. Mus., 47:472, October 29, type from Miquihuana, Tamaulipas.
Distribution in Tamaulipas.—West of Sierra Madre Oriental.
The six specimens examined were collected in the desert area west of the Sierra Madre Oriental. At Nicolás a trap set in front of a hole held one specimen, and another was trapped beneath a brush fence that inclosed a cornfield. Dipodomys merriami and Perognathus penicillatus also were trapped beneath the fence.
A subadult from Nicolás is slightly larger (see measurements) than either of two subadults from four miles north of Jaumave and an old specimen from eight miles north of Tula, except in the interorbital constriction, which is narrower. Nevertheless measurements of Tamaulipan Onychomys torridus resemble those given by Hollister (1914:483) for O. t. subrufus. A specimen from Nicolás is also darker than other individuals examined.
A female taken on July 15, four miles north of Jaumave, was lactating.