1905. Lepus pinetus robustus V. Bailey, N. Amer. Fauna, 25:159, October 24, type from 6000 ft., Davis Mts., Jeff Davis County, Texas.
1951. Sylvilagus floridanus robustus, Hall and Kelson, Univ. Kansas Publ., Mus. Nat. Hist., 5:56, October 1, 1951.
Marginal records.—Texas: The Bowl, Guadalupe Mts. (Hall and Kelson, 1951:56); Chisos Mts. (Nelson, 1909:195); 35 mi. S Marfa (ibid.).
Sylvilagus floridanus russatus (J. A. Allen).
1904. Lepus (Sylvilagus) russatus J. A. Allen, Bull. Amer. Mus. Nat. Hist., 20:31, February 29, type from Pasa Nueva, southern Veracruz.
1909. Sylvilagus floridanus russatus, Nelson, N. Amer. Fauna, 29:186, August 31.
Marginal records (Nelson, 1909:187).—Veracruz: Catemaco; Coatzacoalcos; Minatitlan; type locality; Jimba (KU 19895).
Sylvilagus floridanus similis Nelson.
1907. Sylvilagus floridanus similis Nelson, Proc. Biol. Soc. Washington, 20:82, July 22, type from Valentine, Cherry County, Nebraska.
Marginal records.—Manitoba: Dauphin (Anderson and Rand, 1943:24). Minnesota: Ten Mile Lake (Surber, 1932:74). Nebraska: Neligh (Nelson, 1909:174). Kansas: Long Island (ibid.); 3 mi. N and 2 mi. W Hoisington (16509 KU); Lane County (5520 KU); Elkader (5595 KU). Colorado: Arvada (Cary, 1911:158). Wyoming: 6400 ft., 3 mi. E Horse Creek, P. O. (15936 KU). Nebraska: 8 mi. E Chadron (39380 KU). Montana: Little Missouri River, 7 mi. NE Albion (Hall and Kelson, 1951:52); Box Elder Creek, 25 mi. SW Sykes (ibid.). North Dakota: Oakdale (Bailey, 1927:134).