264 
14. HrsPEROMYS ALBIGULARIS, 0. Ss. 
Of this well-marked and apparently new species the collection 
contains two specimens, and one being adult, whilst the other is not 
more than half-grown, I should be able to give a tolerably good ac- 
count, but that, both specimens being in skin, the dimensions are 
less likely to be exact. 
The general form is very much like that of H. longicaudatus, and 
it pertains strictly to the same division of the genus (Calomys), but 
is a much larger species, and is differently coloured. The head is 
moderately elongated, and the snout somewhat pointed. Muffle with 
two very distinct prominences beneath the nostrils; ears small, 
roundish, and clothed with short hair externally, and internally near 
the margin. Fore feet of medium size and proportion, their claws 
short and rather weak, the thumb furnished with a small but well- 
developed claw of a rounded form; the upper surface of the toes 
almost naked. Jind feet long, of moderate breadth; the upper 
surface of the toes nearly naked, excepting at the root of the claws, 
which are hidden by a tuft of curved white hairs ; upper surface of 
the tarsus also but very slightly hairy, its under surface quite naked ; 
the claws of medium proportion, and nearly white. The tail, which 
is longer than the head and body, tapers evenly throughout, is naked, 
or nearly so, and annulated with very fine scales. 
The fur is rather long, soft, and somewhat glossy; on all the 
upper parts it is dark dusky-grey at the root, tipped with yellowish- 
brown, and thickly mixed with shining black hairs, which are very 
numerous on the dorsal region. On the head the fur becomes 
darker, and yet more so towards the snout, so that from the eyes to 
the latter it is almost black. Cheeks and sides of the neck yellowish- 
brown, with a distinct line of division where it meets the darker 
colour of the head. The chin is ashy-grey. On the throat is a lon- 
gitudinal well-defined space of pure white (the hairs being white from 
root to tip), which commences anteriorly very narrow, but, expanding 
as it passes backward, occupies the whole space between the fore legs, 
and passes gradually into the colour of the belly, where the fur has 
the tips only of a greyish-white, which is confined to the mesial line. 
The hair on the ears is black ; a spot of yellowish-brown marks the 
root of the whiskers ; the fur, which extends along the outer surface 
of the arm to the wrist, is dark grey, and that on the upper surface of 
the tarsus ashy-grey ; the tail is dark grey above, pale brown beneath. 
The clear line of separation of the dark colour of the head, from 
the paler colour of the cheeks, and the white wedge-shaped mark on 
the throat, equally distinct from the colour of the cheeks, will at 
once distinguish this species. 
A young one half-grown resembles the adults, excepting that the 
fur is shorter, and the white mark on the throat less pure and not so 
well defined. 
Length of the head and body, about ...... ] 
= GLAM MEMSSE As co. 2 US Le Soi 
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