22O Bulletin American Museum of Natural History. [Vol. XIII, 



by some small animal of about their own size. The other was 

 taken in a trap placed in a runway. Their stomachs all con- 

 tained beetles." H. H. K. 



4. Lagidium peruanum Meyen. One specimen, Tierapata, 

 Peru, Oct. 9, 1899. 



" This species is not to be included among the animals of this 

 region [Juliaca]. They exist in suitable places from Lake 

 Titicaca to the Andes. None were seen on the east side of 

 the range, nor have I heard of any on this side. They subsist 

 upon grass and inhabit the rough, rocky cliffs, living in the 

 crevices of the rocks. They are very active, and are able to run 

 up or down a perpendicular rock. They are most active in the 

 morning and evening, though I have seen them at all hours of the 

 day." H. H. K. 



5. Dactylomys peruanus, sp. nov. 



Type, No. 16060, $ ad., Juliaca, Peru, altitude 6000 feet, March 15, 1900 ; 

 Coll. H. H. Keays. 



Pelage soft and full, with long bristly overhairs, but without spines. Above 

 nearly uniform yellowish brown, varied with black-tipped hairs, without ten- 

 dency to a darker median area ; lighter yellowish brown on the sides ; sides 

 of nose whitish ; top of nose sooty gray ; top of head, to a line in front of the 

 ears, gray varied with light yellowish brown ; below white, tinged irregularly 

 with pale buff, and with a faint brownish post-pectoral area ; the color of the dor- 

 sal surface encroaches upon the sides of the abdomen, near the lower edge of which 

 are situated the mammae, leaving a very narrow white ventral area ; base of the 

 tail below bright ferruginous ; fore arms and legs concolor with the sides of 

 the body ; fore and hind feet grayish brown, becoming lighter on the toes ; ears 

 broad, rounded above, brown, nearly naked, with a thin marginal fringe of long 

 bushy hairs ; tail considerably longer than the body, for the basal two or three 

 inches heavily clothed with long black hairs tipped with whitish, giving a 

 grizzled dark gray effect above and on the sides, lighter below ; apically the 

 hairs become thinner, the annulations gradually becoming visible at about the 

 end of the basal fourth ; the rest of the tail is thinly clothed with long brownish 

 black hairs, which form a well-developed tuft at the end, the scales, except at 

 the extreme tip, visible through the hairy covering. The greater part of the 

 head and the basal portion of the tail are gray, in strong contrast with the dark 

 yellowish brown color of the upper surface of the body. Mammae 4, abdominal; 

 a least, no others can be discovered in the present specimen. 



Measurements. Total length, 560 mm ; head and body, 240 ; tail vertebrae, 

 320 ; hind foot, 51 (without claws, 44) ; ear from notch (in dry skin), 14. 



Skull. Unfortunately the basal portion is broken, so that full measurements 

 cannot be taken. Total length, ; basal length, ; zygomatic width, 



