_Measurements._--Average and extreme measurements of five females and three males from one mile south of Altamira are, respectively, as follows: 243.5 (235-250), 260, 260, 265; 82.0 (78-85), 87, 93, 89; 32.2 (31-33), 35, 35, 33; ear from notch in both sexes, 5; condylobasal length, 42.3 (41.3-43.1), 46.0, 48.0, 46.2; zygomatic breadth, 26.6 (25.1-27.7), 30.4, 31.2, 30.5; interorbital constriction, 6.2 (6.1-6.3), 6.0, 6.2, 6.3; length of nasals, 14.6 (14.0-15.3), 17.0, 16.8, 15.9; alveolar length of maxillary tooth-row, 9.0 (8.6-9.3), 9.9, 10.0, 9.4. _Records of occurrence._--Specimens examined, 19: 1 mi. S Altamira, 18; 10 mi. NW Tampico, 1. Additional record: Altamira (Goldman, 1915:134). =Heterogeomys hispidus negatus= Goodwin Hispid Pocket Gopher 1953. _Heterogeomys hispidus negatus_ Goodwin, Amer. Mus. Novit., 1620:1, May 4, type from Gómez Feras [Farías], 1300 ft., Tamaulipas. _Distribution in Tamaulipas._--Known only from the vicinity of the type locality. Specimens of this pocket gopher were taken in large Macabee traps, at night with the aid of a dog, and by natives using slingshots. Mounds of _H. hispidus_ were common two miles west of El Carrizo near banana trees; the mouths of burrows were four to five inches in diameter. Two females collected at this locality on April 16 and 17 were lactating. Specimens examined of _H. hispidus_ from Tamaulipas resemble the description of _H. h. negatus_ more than that of _H. h. concavus_, and are referred, therefore, to _negatus_. I assume, on geographic grounds, that the individuals reported by Hooper (1953:5) as _concavus_ are _negatus_; they are here referred to as _negatus_. If this referral is correct, the subspecies _concavus_ probably does not occur in Tamaulipas. _Records of occurrence._--Specimens examined, 6: Ejido Santa Isabel, 2 km. W Pan-American Highway, 2000 ft., 1; 2 km. W El Carrizo, 1; 5 km. W El Carrizo, 4. Additional records: Rancho Pano Ayuctle (Hooper, 1953:5); Gómez Farías (Goodwin, 1953:1). =Cratogeomys castanops= Yellow-faced Pocket Gopher Two subspecies of _Cratogeomys castanops_ occur in Tamaulipas, _C. c. planifrons_ in the higher elevations of the Sierra Madre Oriental in the western part of the state, and _C. c. tamaulipensis_ on the plains of the Río Grande. Specimens from Miquihuana were trapped in tunnels at 6400 feet elevation. At Palmillas, individuals were trapped in an area of mesquite, other bushes and "lechuguilla." Three specimens from southeast of Reynosa were collected in traps set along the dikes of irrigation ditches. Most specimens from Nicolás were brought by natives to the collector, but some were caught in traps set in tunnels among the desert bushes. =Cratogeomys castanops planifrons= Nelson and Goldman