1837. Lepus aquaticus Bachman, Jour. Acad. Nat. Sci. Philadelphia, 7:319, type locality western Alabama.
1909. Sylvilagus aquaticus, Nelson, N. Amer. Fauna, 29:270, August 31.
1895. Lepus aquaticus attwateri J. A. Allen, Bull. Amer. Mus. Nat. Hist., 7:327, November 8, type from Medina River, 18 mi. S San Antonio, Bexar County, Texas.
1899. Lepus telmalemonus Elliot, Field Columb. Mus., publ. 38, zool. ser., 1:285, May 25, type from Washita River, near Dougherty, Murray County, Oklahoma.
Marginal records.—Illinois: 6 mi. N Sesser (Cockrum, 1949:427). Indiana: Point Township (Harrison and Hickie, 1931:319). Tennessee: 5 mi. W Hornbeak (Kellogg, 1939:292); Henryville (A. H. Howell, 1909:63). Alabama: Huntsville (Nelson, 1909:273); Big Crow Creek near Stevenson (A. H. Howell, 1921:71). South Carolina: "about" 3 mi. SE Westminster (F. Sherman, 1939:259); "about" 5 mi. W Iva (ibid.). Georgia: Fulton County (ibid.); Lumpkin (Nelson, 1909:273). Alabama: Castleberry (ibid.). Louisiana: Covington (Lowery, 1936:32); Kleinpeter (ibid.). Texas (Nelson, 1909:273): Sourlake; Richmond; Medina River, 18 mi. SW San Antonio; Gurley. Oklahoma: 7 mi. NW Stillwater (Blair, 1939:129). Kansas: Crawford County (8826 KU). Arkansas: along White River near Springdale (Black, 1936:34). Missouri: 3 mi. SW Udall (Leopold and Hall, 1945:145). Arkansas: White River near Augusta (Dellinger and Black, 1940:190). Missouri: St. Francis River, W of Senath (Nelson, 1909:273).
- S. p. palustris
- S. p. paludicola
- S. a. aquaticus
- S. a. littoralis
Sylvilagus aquaticus littoralis Nelson.