MAMMALIA. 
71 
2, e; of the lower jaw, fig. 2, d. Fig. 2, b, represents the incisors of the upper jaw 
magnified. Fig. 21, a, Plate 34, represents the skull, viewed from beneath, 
fig. 2 l,b, is the side view of the same, and fig. 21, c, is the lower jaw. 
“ Specimens were procured at Port Desire, St. Julian, and Santa Cruz ; at 
this latter place they were caught in numbers, (in traps baited with cheese,) both 
near the coast and on the interior plains. A specimen from Santa Cruz weighed 
1336 grains. In the early part of January, there were young individuals at Port 
St. Julian.” — D. 
Reithrodon typicus, Waterh., Proceedings of the Zoological Society of London for February 1837, p. 30. 
R. vellere supra, pilis flavescenti-fuscis et nigrescentibus intermixtis composito ; 
regione circa oculos, genis, lateribusque corporis auratis, pilis pallidb fascis inter- 
mixtis ; partibus inferioribus auratis ; rhinario ad latera Jlavescenti-albo ; auribus 
magnis, intils pilis jlavis, ex ties Jlavis et fuscis, indutis ; caudd supra pallidb fused, 
subtiis sordidb alba ; pedibus albis. 
Description. — Ears large ; tarsi moderate ; fur moderately long ; general tint 
of the upper parts brown— of the upper surface of the head blackish ; on 
the cheeks and flanks a rich yellow tint prevails; the under parts of the head 
and body are bright yellow ; the feet are white ; the tail is brownish above 
and dirty white beneath. The ears are tolerably well clothed with hairs, and 
these are of a yellowish colour, excepting on the fore part, externally, where 
they are brown ; the tarsi are covered beneath with grayish brown hairs ; the 
hairs of the moustaches are numerous and moderately long, black at the base 
and grayish at the apex. The hairs of the back are deep gray at the base, 
broadly annulated with yellow near the apex, and black at the apex ; on the 
upper surface of the head the hairs are very narrowly annulated with yellow, 
hence a blackish hue prevails. The longer hairs on the back are black ; the 
hairs of the throat and belly are gray at the base, and broadly tipped with 
yellow. The incisors are yellow. 
2. Reithrodon typicus. 
In. Lines. 
6 0 
In. Lines. 
Length from nose to root of tail 
of tail 
from nose to ear 
Length of tarsus (claws included) 
of ear 
Habitat, Maldonado, La Plata, (June). 
* The tail is imperfect. 
