_Marginal records._--Utah: 5250 ft., Willow Creek (Durrant, MS). Colorado (Nelson, 1909:232): Rifle; Villa Grove; Medano Ranch. New Mexico: Hondo Canyon (Nelson, 1909:232); Cieneguilla (_ibid._); Juan Tafoya (Bailey, 1932:59). Arizona (Nelson, 1909:232): Holbrook; Winslow. Utah: Canesville (_sic_) (Nelson, 1909:232); Wellington (Durrant, MS). =Sylvilagus aquaticus= Swamp Rabbit Total length, 530-540; tail, 67-71; hind foot, 105-110; length of ear from notch (dry), 63-67. Upper parts blackish brown or reddish brown; underparts with some white; under side of tail white; skull robust; posterior extensions of supraorbital processes joined for their entire length with side of braincase or, in some specimens, with a small foramen between the braincase and the base of the posterior extension of the supraorbital process. This big rabbit is a stronger runner than the smaller marsh rabbit and is easily distinguished from the smaller species by larger size and white, instead of brownish or grayish, underside of the tail. SYLVILAGUS AQUATICUS AQUATICUS (Bachman). 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). [Illustration: FIG. 42. Distribution of _Sylvilagus palustris_ and _Sylvilagus aquaticus_. 1. _S. p. palustris_ 2. _S. p. paludicola_ 3. _S. a. aquaticus_ 4. _S. a. littoralis_ ] SYLVILAGUS AQUATICUS LITTORALIS Nelson.