This subspecies has been reported previously from Tamaulipas only from Altamira. Specimens from 10 kilometers north and eight kilometers west of El Encino and 70 kilometers south of Ciudad Victoria, judging by their large size, dark color, and ochraceous brown (rather than pale ochraceous as in _S. f. chapmani_) upper sides of the hind feet are assignable to _connectens_. Goodwin (1954:7) reported specimens from Chamal, Joya de Salas, Gómez Farías, and Pano Ayuctle as _S. f. chapmani_, remarking that they were intergrades between _chapmani_ and _connectens_. Specimens reported by Goodwin are here assigned to _S. f. connectens_ because the measurements of the specimen from eight kilometers west of El Encino are typical of that subspecies. _Records of occurrence._--Specimens examined, 4: 10 km. N, 8 km. W El Encino, 400 ft., 1; 2 km. W El Carrizo, 2; 9 mi. SW Tula, 5200 ft., 1. Additional records (Goodwin, 1954:7, unless otherwise noted): Chamal; La Joya de Salas; Gómez Farías; Rancho Pano Ayuctle; Altamira (Nelson, 1909:186). =Lepus californicus= Black-tailed Jack Rabbit The black-tailed jack rabbit is the only species of _Lepus_ known from Tamaulipas and is represented there by three subspecies, _L. c. merriami_ of the northern part of the state, _L. c. altamirae_ of the southeastern coastal plains, and _L. c. curti_ of the barrier beach south of Matamoros. The known ranges of the three subspecies are not presently known to meet in Tamaulipas. =Lepus californicus altamirae= Nelson 1904. _Lepus merriami altamirae_ Nelson, Proc. Biol. Soc. Washington, 17:109, May 18, type from Altamira, Tamaulipas. 1951. _Lepus californicus altamirae_, Hall, Univ. Kansas Publ., Mus. Nat. Hist., 5:45, October 1. _Distribution in Tamaulipas._--Southern coastal plain north certainly to vicinity of Soto la Marina. The two specimens examined in this study (see below) are intermediate between _L. c. altamirae_ and _L. c. curti_, but show greater resemblance to the former. In measurements they resemble _altamirae_ rather than the smaller _curti_. They approach the latter in length of hind foot and are intermediate between the two subspecies in basilar length; in one specimen, the dimensions of the rostrum are as in _curti_ and the other has the black patch on the posterior surface of the ear well developed, as in _altamirae_, but in the other the black is reduced. _L. c. altamirae_ has been known previously only from Altamira. _Measurements._--Two male adults (55415, 55416) from north of Soto la Marina, afford the following external measurements: 610, 590; 100, 100; 124, 125; 124, 122 (length of ear from notch, dry, 114, 110). Cranial measurements are: basilar length, 75.1, 74.4; length of nasals, 46.1, 41.9; width of rostrum at PM, 25.1, 28.7; height of rostrum in front of PM, 25.2, 21.5; diameter of auditory bulla, 14.1, 13.0.