_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. _Distribution in Tamaulipas._--Known only by the three specimens mentioned in the original description from two barrier islands in northeastern part of state. _Records of occurrence._--Specimens examined, 3: 88 mi. S, 10 mi. W Matamoros, 2; 90 mi. S, 10 mi. W Matamoros, 1. =Lepus californicus merriami= Mearns 1896. _Lepus merriami_ Mearns, Preliminary diagnoses of new mammals from the Mexican border of the United States, p. 2, March 25, type from Fort Clark, Kinney Co., Texas. 1909. _Lepus californicus merriami_, Nelson, N. Amer. Fauna, 29:148, August 31. _Distribution in Tamaulipas._--Northern and western parts of state. The two specimens examined, an adult female and a young male, from the barrier beach 33 miles south of Washington Beach are intergrades between _L. c. merriami_, reported from the mainland from as near as Matamoros, and _L. c. curti_, which occurs farther to the south on the same series of barrier beaches. Of seven characters that seem to differentiate the two subspecies, the adult female from 33 miles south of Washington beach resembles _merriami_ in four as follows: tips of ears black (white in _curti_); nasals long; hind foot long; and supraoccipital process broad. The specimen resembles _curti_ in shortness of tail and in having small auditory bullae. Breadth of rostrum above premolars, the seventh character, is less than in typical specimens of either of the two subspecies. More material is needed from the barrier beach in order to establish with certainty the relationships between jack rabbits occurring there. _Records of occurrence._--Specimens examined, 4: 33 mi. S Washington Beach, 2; 12 mi. NW San Carlos, 1300 ft., 2. Additional records: Nuevo Laredo (Nelson, 1909:150); Mier (_ibid._); Camargo (_ibid._); Matamoros (Hall, 1951:185); Tamaulipeca, San Carlos Mts. (_ibid._). =Spermophilus mexicanus parvidens= Mearns Mexican Ground Squirrel 1896. _Spermophilus mexicanus parvidens_ Mearns, Preliminary diagnoses of new mammals from the Mexican border of the United States, p. 1, March 25, type from Fort Clark, Kinney Co., Texas. _Distribution in Tamaulipas._--Northern part of state, south at least to Xicotencatl.