62 ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 



The molars of the upper jaw are figured in Plate 34, fig. 13, a, and those of 

 the lower jaw, fig. 13, b. 



" Caught in the interior plains of Patagonia in lat. 50°, near the banks of the 



Santa Cruz. 



?> 



D. 



23. MUS GRISEO-FLAVUS. 



Plate XXI. 



Mus griseo-flavus, Water h., Proceedings of the Zoological Society of London for February 1837, p. 28. 



M. supra griseus flavo-lavatus, ad latera Jlavus, subtus albus ; pedibus albis ; auribus 

 magnis etferh nudis ; cauda caput corpusque fere cequante, supra fusco-nigricante, 

 subtus alba ; vellere longo, molli. 



Description. — Ears large ; tail rather shorter than the head and body taken 

 together ; tarsi slender, and moderately long ; fur long and very soft ; general 

 tint of the upper parts of head and body grayish, washed with brownish yel- 

 low ; on the sides of the body a palish yellow tint prevails ; feet, chin, throat, 

 and under parts of body pure white ; tail rather sparingly clothed with 

 hairs, those on the apical portion rather long, and forming a slight pencil at 

 the tip ; on the upper side and at the tip of the tail the hairs are brown, on 

 the under side they are dirty white ; the ears are very sparingly clothed with 

 minute brownish yellow hairs internally ; externally, on the fore part, the 

 hairs are rather longer and of a brown colour ; the upper incisors are orange, 

 and the lower incisors are yellow ; the hairs of the moustaches are long, and 

 of a black colour ; the hairs of the back are deep gray at the base, brownish 

 at the tip, and annulated with pale brownish yellow near the tip ; the longer 

 hairs are brown ; the hairs of the belly are white externally, and gray at the 

 base ; on the throat the hairs are white to the root. 



Length from nose to root of tail 



of tail . 4 



from nose to ear 



In. 



Lines. 



6 



8 



5 



6 



1 



41 



*2 



Length of tarsus (claws included) 



of ear 



In. Lines 

 1 Lr z 



8 



Habitat, Northern Patagonia (August.) 



The molars of the upper jaw are figured in Plate 34, fig. 15, a, and those of 

 the lower jaw, fig. 15, b. 



" Inhabits the dry gravelly plain, bordering the Rio Negro.' 



D. 





