Bulletin American Museum of Natural History. [Vol. XIV, 



haired and slightly penicillate ; fore and hind feet above grayish white, well 

 covered with short hairs ; soles and palms flesh color, sparsely haired, the 

 flesh-colored skin barely showing through the hairs. 



Measurements. Total length (of type), 165 mm.; head and body, 85 ; tail, 

 80 ; hind foot, 23 ; ear (from dry skin), 13. 



Skull much as in E. elegans but rather smaller, and with the same character of 

 dentition. Total length, 24 ; basilar length, 17.5 ; zygomatic breadth, 12 ; 

 mastoid breadth, u ; interorbital breadth, 4 ; length of nasals, TO ; palate, 5 ; 

 palatal foramina, 5X2 ; interparietal, 11X2.5 ; upper toothrow, 4 ; lower jaw, 

 12 ; height at condyle, 5.3 ; lower toothrow, 4. 



This species has externally the appearance of a small-eared 

 Phyllotis with furred soles. Its nearest known ally appears to be 

 E. elegans, from which it differs in having much smaller ears and 

 a shorter tail, the foot and body being nearly as in E. elegans. 



The. type of E. elegans was collected by Darwin at Bahia 

 Blanca and is much changed in color by exposure for a long 

 time (formally) as a mounted specimen. Two other specimens in 

 fair condition from Chupat, northern Patagonia, identified as 

 E. elegans by Mr. Thomas, very closely resemble in color the 

 series of E. morgani from Sta. Cruz, but differ from them strik- 

 ingly in their much larger ears and much longer tails There 

 are no flesh measurements, but the vertebrae still remain in the 

 tail and the skins are fairly made up. Head and body (in skin), 

 78 ; tail vertebrae, 97 ; ear from notch, 19 The other specimen 

 has the same proportions but is a little smaller. 



This species is based on a large series of specimens collected 

 at or near Cape Fairweather, Patagonia, by Mr. A. E. Colburn, 

 for the Princeton Patagonian Expedition, generously supported 

 by Mr. J. Pierrepont Morgan, after whom the species is named. 



Akodon tucumanensis, sp. nov. 



Type, No. 0-7-9-13, British Museum, ? adult, Tucuman, Argentina, alt. 

 450 m. , June 29, 1899; coll. L. Dionelli. 



Pelage very soft and full. Above dull ruddy brown, darker and more red- 

 dish than in A. xanthorhinus, minutely grizzled with black- tipped hairs, 

 darkest over the back, lighter on the sides ; sides of nose rather lighter, but 

 not very distinctly different from the front of the head, in this differing from 

 the A. xanthorhinus-canescens group ; below buffy gray varying to strong buff ; 

 ears small, dark brown, edged within with buffy brown hairs ; feet dusky gray 

 above, soles of hind feet dusky brown ; tail indistinctly bicolor, very thickly 

 haired ; blackish brown above, sides and below lighter, pale buffy gray. 



