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Show 202 DR. J. E. GRAY ON SACCOMYINAE. [Mar. 12, 3. PEROGNATHUS HISPIDUS, Spencer Baird, Mamm. N. A. 421, t. 51. f. 4, t. 69. f. 2, t. 83. f. 6. Tail simple, sides with a fulvous stripe ; ears small. Above cinnamon and black mixed; outside of fore and hind legs and upper surface of feet white; hairs very rigid, long, very thick, coarse, stiff, bristly ; hair of tail long, concealing the whorls of scales. Hab. Matamoras, Mexico. 4. PEROGNATHUS BICOLOR. B.M. Perognathus monticola, Gerrard, Cat. Bones B. M. (not Baird). Black; upper lip, lower edge of the cheek-pouch, head, and underside of body and inner sides of limbs white. Fur uniform bristly; bristles elongate, slender, with a slender point, and intermixed with very slender elongated hairs. Tail as long as the body, with rings, square scales, and short bristly hairs. Hab. Honduras (SalU). There is a Spiny Rat from Honduras with a longer tail and smooth front teeth, agreeing in colour with the above. 3. ABROMYS, Gray. Upper cutting-teeth with a longitudinal groove ; fur soft, abundant, uniform, long, and close. Tail tapering, cylindrical, covered with short hairs almost hiding the rings of scales. Perognathus, sp., S. Baird, M a m m . N. A. 423. ABROMYS LORDI. B.M. Fur soft, abundant, grey-washed, with blackish tips; chin and underside of body whitish; tail tapering, grey, with a blackish-brown upper surface and tip ; hair of the back dark lead-colour, with a short grey band and minute black tip. Perognathus monticolor, Lord, in B.M. ?Perognathus monticola, S. Baird, M a m m . N . A. 422, t. 51. f. 3 (skull). Hab. British Columbia (Lord). The teeth destroyed. Length of body and head 3 inches, of tail 3 inches. It differs from Dipodomys phillipsii and other species of that genus in having no white spot over the eye at the base of the ear, or white band across the thigh. 4. CRICETODIPUS. Upper cutting-teeth with a groove; ears small, without any lobe to the antitragus. Hairs ? Soles of the hind feet covered with short hairs on the posterior half; tail scantily hairy, not tufted at the tip. Cricetodipus, Peale, M a m m . & Birds U. S. Expl. Exped. 1848, p. 33. Perognathus cricetodipus, Spencer Baird, M a m m . N. A. 416, 418. |