1944. Reithrodontomys fulvescens tropicalis Davis, Jour. Mamm., 25:393, December 12, type from Boca del Río, 8 km. S city of Veracruz, Veracruz.
Distribution in Tamaulipas.—Tropical area in southeastern part of state.
Most of the specimens examined of R. fulvescens are included in this subspecies, principally because of their reddish coloration that is characteristic of R. f. tropicalis. According to the original description by Davis (1944:393) this subspecies is smaller than griseoflavus and the posterior border of the incisive foramina terminate anterior to the plane of the molars. But, these characteristics are not found in any specimen examined from Tamaulipas and the average of external measurements is more than those given by Hooper (1952:109) for tropicalis. Of all specimens from Tamaulipas, those from the vicinity of Altamira and Tampico are most nearly typical of tropicalis. Weights of seven males and five females, from the Sierra de Tamaulipas, were, respectively, 13 (11-15), and 11 (9-14) grams.
Records of occurrence.—Specimens examined, 51: Rancho Santa Rosa, 25 km. N, 13 km. W Cd. Victoria, 1; Cd. Victoria, 3; Sierra de Tamaulipas, 10 mi. W, 2 mi. S Piedra, 1200 ft., 12; 2 km. W El Carrizo, 1; Ejido Santa Isabel, 2 km. W Pan-American Highway, 2000 ft., 14; Rancho Pano Ayuctle, 25 mi. N, 3 km. W El Mante, 300 ft., 4; Rancho Pano Ayuctle, 6 mi. N Gómez Farías, 300 ft., 4; 6 mi. N, 6 mi. W Altamira, 2; 1 mi. S Altamira, 3; 16 km. N Tampico, 3; 7 km. N Tampico, 4.
Additional records: Hidalgo (Hooper, 1952:110); 5 mi. NE Gómez Farías, 1100 ft. (ibid.); La Azteca, 5 km. NNE Gómez Farías (Goodwin, 1954:11); Gómez Farías (ibid.); Antiguo Morelos (Hooper, 1952:110); 2 mi. W Tampico (Ingles, 1959:396).
Reithrodontomys mexicanus mexicanus (Saussure)
Mexican Harvest Mouse
1860. R[eithrodon]. mexicanus Saussure, Revue et Mag. Zool., Paris, ser. 2, 12:109, type from mountains of Veracruz; restricted to Mirador, Veracruz, by Hooper, Miscl. Publ. Mus. Zool., Univ. Michigan, 77:140, January 16.
1914, Reithrodontomys mexicanus mexicanus, A. H. Howell, N. Amer. Fauna, 36:70, June 5. Not Reithrodontomys mexicanus (Saussure), being instead of J. A. Allen, 1895:135, which in part equalled Reithrodontomys fulvescens difficilis.
Distribution in Tamaulipas.—Known from two localities, but probably occurs in all tropical areas in south part of state.
As noted before, J. A. Allen (1891:223) reported specimens from Rancho Santa Rosa as Ochetodon mexicanus, but he used this name for the species now known as R. fulvescens.