MAMMALIA. 
61 
In. Lines. 
Length from nose to root of tail (English 
measure) . . . .GO 
of tail . . ..66^ 
In. Lines. 
Length of ears . . . . . 0 9f 
of tarsus (the claws included) . 1 3f 
It appears from this description that the Mus Angouya is a smaller animal, 
and differs both in colouring and proportions from the Mas Braziliensis. Brandt 
has figured and described a rat under the name of Mus Angouya, which in many 
respects agrees better with Azara’s description ; there are, however, discrepancies 
in the dimensions. 
22, Mus MICROPUS. 
Plate XX. 
Mus micropus, Waterh., Proceedings of the Zoological Society of London for February 1837, p. 17. 
M. supra fuscus ; subtus cinerescenti-albus, pallidb flavo tinctus ; pedibus pilis sordidb 
albis tectis, antipedibus parvulis ; auribus parvulis ; cauda , quoad long it udine in, 
corpus ferb cequante, supra fused, subtus so/didb alba. 
Description. — Form stout, ears rather small, tail nearly equal to the body in 
length, fur very long and moderately soft, general colour of the upper parts of 
head and body, brown ; of the sides of the body grayish, faintly washed 
with yellow, of the under parts grayish white, faintly tinted with yel- 
low ; hair covering the upper surface of the feet dirty white ; on the 
tarsus there is a very slight yellow tint ; ears well clothed with hairs, those 
on the inner side chiefly of a yellow colour; tail above, dusky brown; beneath 
dirty white : hairs of moustaches black at the base and grayish at the apex ; 
incisors pale yellow : hairs of the back deep gray at the base, annulated with 
brownish yellow near the apex, and dusky at the apex ; longer hairs dusky 
black ; hairs of the belly deep gray at the base and broadly tipped with 
yellowish white. 
Length from nose to root of tail 
of tail 
from nose to ear 
In. Lines. In. Lines. 
6‘ 0 Length of tarsus (claws included) . . 1 Of 
3 8 of ear ... 06 
1 4 
Habitat, Santa Cruz, Patagonia, {April.) 
