1882.] MR. O. THOMAS ON RODENTS FROM PERU. 111 
I am not quite certain about the identity of these specimens with 
Mr. Tomes’s Ecuadorean species, as H. caliginosus is described as 
being 5 inches long, with nearly naked ears and feet, but by measur- 
ing the largest individual of the present series along the curves, a 
length of nearly 5 inches may be obtained ; and as the colours and 
other dimensions agree very fairly, I prefer to regard them as 
H., caliginosus, rather than to describe them as new. 
The following is a short description of these specimens :—Fur 
very soft, of medium length. General colour above dark grizzled 
orange-black, the colour resulting being as dark as in J. obscurus, 
Waterh. Belly pale yellowish white, the bases of the hairs grey. 
Ears, feet, and tail covered with short dark brown hairs. Ears with 
a rounded projection on their anterior margin. Fifth hind toes 
reaching to between the base and the middle of the first phalanx of 
the fourth toes. Tail uniformly black all round, upperside of feet 
granulated with black, and the soles of the hind feet also deep black. 
This blackness of all the extremities forms a ready means of distin- 
guishing the present species from the preceding one, in which the 
tail is brown above and grey beneath, and the soles have scarcely a 
tinge of black. 
The British Museum also possesses a specimen certainly identical 
with these Peruvian ones, which was collected by Mr. T. K. Salmon 
at Concordia, Medellin ; so that, as Ecuador is just between that loca- 
lity and the present one, the probability of M. Stolzmann’s speci- 
mens being the true H. caliginosus is greatly increased. 
‘This is the most diurnal species of all, and on that account is 
very subject to the attacks of @strus. The base of its tail is 
naked and white; and the fly deposits its eggs on this spot, as may 
be seen in those specimens which contain the larve, or from which 
the latter have escaped.” 
In addition to the above notes on the Rodents collected by M. 
Stolzmann, it may be useful to give the localities and dates for the 
three species of Opossum obtained by him. These are:— 
14. DipELPHys NuDICAUDATA, Geoff. 
a, 6. 2 and young, Chirimoto, 5400', July 1880. 
15. DipELPHYs CINEREA, Temm. 
a. 9, Chirimoto, 5400’, July 1880. 
16. DipeLPpHys muRinA, Linn. 
a. 2, Tambillo, 5800’, Feb. 1878. 
b,c. 2 and ¢, Tumbez, sea-level, June 1876. 
