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

 * 18. Akodon lutesens, sp. nov. 



Type, No. 16507, ? ad., Tirapata, Peru (alt. about 15,000 feet), Oct. 21, 

 1900 ; coll. H. H. Keays. 



Pelage very soft and full. Above fulvous gray brown, mixed very slightly 

 with dusky-tipped hairs ; sides dull pale fulvous gray, passing gradually into the 

 pale buffy gray of the whole lower surface ; no distinct eyering ; sides of muzzle 

 and cheeks like rest of the head ; ears very small, well haired, nearly concealed 

 by the surrounding pelage, of the same pale fulvous gray tone as the rest of the 

 dorsal surface ; upper surface of hands dull dusky gray with a faint tint of ful- 

 vous ; upper surface of feet dull yellowish gray ; tail considerably shorter than 

 head and body, scantily haired, with a faint median dusky line above, pale yel- 

 lowish gray on sides, lighter, soiled gray below. 



Measurements. Total length (type), 140 mm. ; head and body, 76 ; tail, 64 ; 

 tarsus, 19 ; ear (in dry skin) 8.5. A second specimen ; a young adult, has the 

 same coloration and proportions, but is smaller (head and body, 70 ; tail, 57). 



Skull. The skull of the type is unfortunately much broken, but that of the 

 topotype, though smaller, is perfect. The skulls seem to offer no special cra- 

 nial distinctions. Total length, type, 24 ; basal length, ; zygomatic breadth 

 (approximate), 12; interorbital breadth, 4; mastoid breadth, 10.5; upper 

 tooth-row, 4. 



This small, soft-haired, dull-colored species is based on two 

 specimens, an adult female and a young adult male, taken at 

 Tirapata, Oct. 21. The collector states they were " shot at 8 A.M. 

 while feeding on the bark of a small sage shrub." 



Akodon lutescens appears to resemble in a general way several 

 other species of the soft-haired, dull-colored section of the genus, 

 but agrees with none of the described species in respect to details 

 of size, coloration, and proportions. It agrees quite nearly in 

 size with A. pusillus ( Philippi) from Valparaiso, Chili, but differs 

 from it in the color of its ears, feet, and underparts. It differs 

 much more widely from any of the other described species. 



19. Sciurus aestuans cucinus Thomas. Three specimens, 

 all adult females, from the vicinity of the Inca Mines. 



* 20. Myotis, sp. Two specimens, representing a third 

 species of this genus from Inca Mines (/. c., p. 227), none of 

 which is as yet satisfactorily determined. 



* 21. Lasiurus varius (Poeppig). One specimen, adult male, 

 Inca Mines, June 16, 1900. " Taken from a woodpecker hole in 

 a dead stub." H. H. K. 



