_Remarks._--These colorful squirrels were taken in thick timber and brush, and locally are referred to as "ardilla pinta" or "ardilla colorada." One female obtained on January 22 is black. Local hunters state that these squirrels are most active early in the morning and late in the afternoon. Two squirrels were seen in copulation on January 19. ~Sciurus negligens~ Nelson Little Gray Squirrel _Sciurus negligens_ Nelson, Proc. Biol. Soc. Washington, 12:147, June 3, 1898. (Type from Alta Mira, Tamaulipas, Mexico.) _Specimens examined_, 17 as follows: 70 km. [by highway] S of Ciudad Victoria and 6 km. W of the [Pan-American] highway [at El Carrizo], 5; 70 km. [by highway] S Ciudad Victoria and 2 km. W El Carrizo, 12. _Remarks._--Referred to as "ardilla chica" locally, these squirrels were most frequently seen in the dense forest of the lower, elevations. Active both in trees and on the ground, these animals were reported as being destructive to corn crops. Females taken in January were lactating. ~Heterogeomys hispidus concavus~ Nelson and Goldman Hispid Pocket Gopher _Heterogeomys hispidus concavus_ Nelson and Goldman, Proc. Biol. Soc. Washington, 42:148, March 30, 1929. (Type from Pinal de Amoles, Queretaro, Mexico.) _Specimens examined_, 5 as follows: 70 km. [by highway] S Ciudad Victoria and 5 km. W El Carrizo, 4; 70 km. [by highway] S Ciudad Victoria and 2 km. W El Carrizo, 1. _Remarks._--These gophers have been compared with specimens of _H. h. hispidus_ from Veracruz (5 km. N Jalapa and 4 km. WNW Fortin) and with specimens of _H. h. concavus_ from San Luis Potosi (Xilitla and vicinity and 3 mi. NW Pujal); the latter were examined through the courtesy of Dr. George H. Lowery, Jr., of the Museum of Zoology at Louisiana State University. These five specimens are assigned to _H. h. concavus_ and resemble in every way this subspecies except: slightly smaller, somewhat darker, and skull with lambdoidal crest less inclined forward. In the latter feature, the single skull available seems to resemble most closely that of _H. h. hispidus_. Unfortunately, all but one skull, that of a subadult female, were destroyed in the field. This is the first known record of this genus in Tamaulipas and the most northern locality from which specimens have been taken. At this latitude, the gopher appears to be restricted to the humid belt on the east face of the Sierra Madre Oriental. These large gophers were difficult to trap by ordinary means; Schaldach got two by using large-sized Macabee traps but the others were taken at night either with the aid of a dog or by natives with slingshots. ~Liomys irroratus texensis~ Merriam Spiny Pocket Mouse _Liomys texensis_ Merriam, Proc. Biol. Soc. Washington, 15:44, March 5, 1902. (Type from Brownsville, Cameron County, Texas.) _Liomys irroratus texensis_ Goldman, N. Amer. Fauna, 34:59, September 7, 1911.