1882.] MR. O. THOMAS ON RODENTS FROM PERU. 103 



grizzled with dark greyish yellow. Belly white, the basal halves of 

 the hairs, however, both above and below, dark slate-colour. The 

 back- and belly-colours rather sharply separated. Feet greyish white. 

 Tail brown above and white below, the latter colour, however, grad- 

 ually becoming darker, so that the distal half of the tail is nearly 

 uniform. Foot-pads prominent ; soles naked, proximal halves quite 

 smooth, distal halves coarsely granulated. Fifth hind toes, without 

 claws, only reaching just to the end of the fourth metatarsals. Ears 

 with a projection on the anterior border'. Skull with well-marked 

 supraorbital ridges. 



" These Rats created great havoc among the stores of maize under 

 the roof of the house. After a time they multiplied to such an 

 extent that I caught 14 in one night. This species also did con- 

 siderable damage in the plantations of cocoa, gnawing holes in the 

 skins of the fruit, and eating the contents." 



5. Hesperomys (Calomys) albigularis. Tomes, P. Z. S. 1860, 

 p. 264. 



a. Cutervo, 9200', Feb. or Mar. 1879. 



b-f. Tambillo, 5800', Feb. 1878. 



g. Callacate, -4800', Apr. 1879. 



h. Huambo, 3700', Apr. and May 1880. 



To this species I refer eight of the specimens, from various loca- 

 lities. As Mr. Tomes's account was drawn up from skins, the follow- 

 ing description may be useful : — 



Fur long, soft and fine, with a few longer black hairs intermixed. 

 General colour above deep rufous, becoming clearer on the sides, 

 and passing gradually into pale rufous on the bell}'. Basal two 

 thirds of the hairs dark slate-colour all over the body, except that in 

 some of the specimens there is a pure white blotch just between the 

 fore legs, a peculiarity which suggested Mr. Tomes's name for the 

 species. Anterior half of the outer and posterior half of the inner 

 sides of the ears thinly covered with black hairs, the remainder nearly 

 naked. Feet white, with the exception of the metacarpals and 

 metatarsals, on which there are a few brown hairs intermixed. Tail 

 very long and slender, above brown and beneath white for its whole 

 length, the two colours rather sharply separated. Anterior border 

 of ears without any projection. Mammae 8, two pectoral and two 

 inguinal pairs. Soles naked, foot-pads large and prominent, fifth 

 hind toes, without claws, reaching to the middle of tlie first phalanx 

 of the fourth toes. 



It will be seen that the above description docs not quite agree 

 with that of Mr. Tomes ; but I do not think that the differences are of 



i See P. Z. 8. 1881, p. 4. 



