208 LLOYD’S NATURAL HISTORY. 
Size small; form slender ; tail long, and generally much ex- 
ceeding the length of the head and body; relative lengths of 
the hind toes as in the preceding sub-genus, but in some 
species the fifth not longer than the second ; pouch wanting ; 
fur straight, slightly woolly in some species. The dark streak 
down the face characterising the two representatives of the 
preceding group is absent. 
From the allied forms the species under consideration may 
be distinguished by the following characters :— 
Size larger than in any other member of the group, although 
considerably inferior to that of the smallest of the species de- 
scribed above; fur soft, close, and slightly woolly; naked 
portion of muzzle as in D. philander, with two notches on each 
side of its lower margin. General colour clear grey, washed 
with yellowish on the sides, and not unfrequently tinged with 
rufous; face grey, witha more or less distinct black band through 
and round each eye; under-parts yellowish-white, with the 
hairs grey at the base; limbs grey; feet nearly naked, and 
either whitish or pale brown. Ears large and rounded, with a 
large pointed projection at the base. Soles of feet with large, 
rounded, and finely striated pads, six anterior and five or six 
posterior, that of the hallux not being fully divided. Nine teats. 
Tail furry for one or two inches at the base, then becoming 
naked and scaly, its colour slaty-grey basally and white or 
yellow terminally, without any mottling at the junction of the 
two colours. Length of head and body about 7 inches ; of 
tail 934 inches. 
Distribution.—Costa Rica to Brazil. 
In size this species may be compared to the English Black 
Rat; but the form from Ecuador described as D. waterhouset, 
and identified with this species by Mr. Thomas, is smaller, and ] 
also differs in the length of the furred portion of the tail. It is 
