MAMMALIA. 



61 



In. Lines. 

 Length from nose to root of tail (English 



measure) . . . . .GO 

 of tail . . . . 6 6i 



In. Lines. 

 Length of ears . . • • . 9 ¥ 

 of tarsus (the claws included) . 1 3j 



It appears from this description that the Mus Angouya is a smaller animal, 

 and differs both in colouring and proportions from the Mus 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, pallidh flavo tinctus ; pedibus pilis sordide 

 albis tectis, antipedibus parvulis ; auribus parvulis ; caudd, quoad longitudinem, 

 corpus fere cequante, supra fused, subtus sordide 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. 



6 



3 



Lines. 

 

 8 



Length of tarsus (claws included) . 

 of ear .... 



In, Lines 

 . 1 Of 

 6 



1 



4 







Habitat, Santa Cruz, Patagonia, (April.) 



