Additional records: Matamoros (Hollister, 1925:60); Rancho del Cielo (Hooper, 1953:11). =Sylvilagus brasiliensis truei= (J. A. Allen) Forest Rabbit 1890. _Lepus truei_ J. A. Allen, Bull. Amer. Mus. Nat. Hist., 3:192, December 10, type from Mirador, Veracruz. 1950. _Sylvilagus brasiliensis truei_, Hershkovitz, Proc. U. S. Nat. Mus., 100:351, May 26. _Distribution in Tamaulipas._--Southern part of state; known only from Rancho del Cielo (Goodwin, 1954:7). =Sylvilagus audubonii parvulus= (J. A. Allen) Desert Cottontail 1904. _Lepus (Sylvilagus) parvulus_ J. A. Allen, Bull. Amer. Mus. Nat. Hist., 20:34, February 29, type from Apam, Hidalgo. 1909. _Sylvilagus audubonii parvulus_, Nelson, N. Amer. Fauna, 29:236, August 31. _Distribution in Tamaulipas._--Western part of state. The specimen examined, a male that weighed 646 grams, was shot at night. This species occurs only in western Tamaulipas. Hall and Kelson (1959:267, map 187) mistakenly plotted El Mulato, as being in the eastern part of the state; actually this locality is in the San Carlos Mountains of the west, near the boundary between Tamaulipas and Nuevo León. _Records of occurrence._--One specimen examined from 4 mi. SW Nuevo Laredo, 900 ft. Additional records (Nelson, 1909:237, unless otherwise noted): Nuevo Laredo; Guerrero; Mier; Camargo; El Mulato (Dice, 1937:256); Miquihuana. =Sylvilagus floridanus= Eastern Cottontail This species occurs throughout Tamaulipas. A female from Soto la Marina, obtained on May 17, was lactating; another from 12 miles northwest of San Carlos, on August 23, carried two embryos that were 15 mm. in crown-rump length. =Sylvilagus floridanus chapmani= (J. A. Allen) 1899. _Lepus floridanus chapmani_ J. A. Allen, Bull. Amer. Mus. Nat. Hist., 12:12, March 4, type from Corpus Christi, Nueces Co., Texas. 1904. _Sylvilagus (Sylvilagus) floridanus chapmani_, Lyon, Smith. Misc. Coll., 45:336, June 15. _Distribution in Tamaulipas._--Northern two-thirds of state. A male and pregnant female from 12 miles northwest of San Carlos weighed, respectively, 650 and 690 grams. _Records of occurrence._--Specimens examined, 17: San Fernando, 180 ft., 3; 12 mi. NW San Carlos, 1300 ft., 3; La Pesca, 3; Soto la Marina, 500 ft., 6; Ejido Eslabones, 2 mi. S, 10 mi. W Piedra, 1200 ft., 2. Additional record: Jaumave (Nelson, 1909:178). =Sylvilagus floridanus connectens= (Nelson) 1904. _Lepus floridanus connectens_ Nelson, Proc. Biol. Soc. Washington, 17:105, May 18, type from Chichicaxtle, Veracruz. 1909. _Sylvilagus floridanus connectens_, Lyon and Osgood, Bull. U. S. Nat. Mus., 62:32, January 28. _Distribution in Tamaulipas._--Southern part of state.