202 DR. J. E. GRAY ON SACCOMYIN^. [Mar. 12, 



3. Perognathus hispidus, Spencer Baird, Manim. 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 cinna- 

 mon 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 under- 

 side 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 {Sam). \ ■■ ■.- r.. ,.i t ?, >v$«vv ' rUnjOA hl-t-i^']). 

 There is a Spiny Rat from Honduras with a longer tail and smooth 

 front teeth, agreeing in colour with the above. / Vfie...vv,€A I^aJ^ (iih t' /■ iT 



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, Mamra. N. A. 423. 



Abromys lordi. B.M. 



Fur soft, abundant, grey -washed, with blackish tips ; chin and under- 

 side 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, Mamm. 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 D>j)odomt/s philUpsii 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, Mamm. & Birds U. S. Expl. Exped. 1848, 

 p. 33. 



Perognathus cricetodipus, Spencer Baird, Mamm. N. A. 416, 418. 



