Marginal records (Nelson, 1909:244).—Sinaloa: Mazatlan; Rosario; Esquinapa. Nayarit: Acaponeta. Colima: Colima; Armeria, thence northward along Pacific Coast.
Sylvilagus cunicularius pacificus (Nelson).
1904. Lepus veraecrucis pacificus Nelson, Proc. Biol. Soc. Washington, 17:104, May 18, type from Acapulco, Guerrero.
1909. Sylvilagus cunicularius pacificus, Lyon and Osgood, Catal. Bull. U. S. Nat. Mus., 62:35, January 28.
Marginal records (Nelson, 1909:242).—Guerrero: El Limón. Oaxaca: Llano Grande, thence westward along Pacific Coast.
Sylvilagus graysoni (J. A. Allen)
Tres Marias Cottontail
1877. Lepus graysoni J. A. Allen, Monogr. N. Amer. Rodentia, p. 347, August, type from Tres Marias Islands, Jalisco; probably María Madre Island. (See Nelson, N. Amer. Fauna, 14:16, April 29, 1899.)
1904. Sylvilagus (Sylvilagus) graysoni, Lyon, Smiths. Misc. Coll., 45:336, June 15.
Marginal records (Nelson, 1909:245): María Madre Island; María Magdalena Island.
Total length, 480; tail, 51; hind foot, 99; ear from notch (dry), 57. This insular species is closely related to Sylvilagus cunicularius of the adjacent mainland but has notably shorter ears and more reddish on the upper parts, sides and legs; the skull is slenderer, especially in the rostral region. The posterior extensions of the supraorbital process are united to the braincase throughout most of their length as in Sylvilagus palustris. The species seems to have a narrow vertical range, occurring from sea level up to only 200 feet.