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.
Records of occurrence.—Specimens examined, 2: 3 mi. N Soto la Marina, 1; 2 mi. NW Soto la Marina, 1.
Additional record: Altamira (Nelson, 1904:109).
Lepus californicus curti Hall
1951. Lepus californicus curti Hall, Univ. Kansas Publ., Mus. Nat. Hist., 5:42, October 1, type from barrier beach 88 mi. S, 10 mi. W Matamoros, Tamaulipas.