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.