>o. 2333. MAMMALIA COLLECTED IN PERU BY HELLER— THOMAS. 235 



Skull (pi. 14, fig. 5) quite of the general make of that of T. hoeops, 

 but conspicuously smaller. Interorbital region narrow, its edges just 

 squared, but not rigged. Brain case smooth, rounded, little ridged. 

 Palatal foramina well open, reaching back just past the anterior 

 end of m\ Bullae of normal size, much smaller than in T. 

 taczanoioskii. 



Dimensions of the type : Head and body, 82 ; tail, 120 ; hind foot, 

 21.5; ear, 16. Slaill — greatest length, 26.1; condylo-incisive length, 

 22.6; zygomatic breadth, 13.6; nasals, 9; interorbital breadth, 3.7; 

 breadth of brain case, 12 ; palatilar length, 10.2 ; palatal foramina, 5.5 ; 

 upper molar series, 3.6. 



7'y^e.— Adult male from Machu Picchu. U.S.N.M. No. 194816. 

 Original number 321. Collected June 8, 1915, 



Twenty-one specimens, as follows: 



Torontoy, 10,700-14,000 feet, 7 (Nos. 194783-5, 194789-90, 194792, 

 194797). 



Machu Picchu, 12,000-14,000 feet, 5 (Nos. 194798, 194800, 194802-3, 

 194816). 



Ocobamba Valley, 9,100 feet, 2 (Nos. 194807-8). 



Lucma, 10,000-11,400 feet, 7 (Nos. 194791, 194810-5). 



This pretty little species is readily distinguished by its small size, 

 buffy washed belly, and the strictly normal characters of its skull ; the 

 incisors not thrown forward as in T. dafhixe^ nor the bullae enlarged 

 .as in T . faczanowskii. 



41. THOMASOMYS DAPHNE Thomas. 



1917. Thoiitnsomys daphne Thomas, Smiths. ISIisc. Coll., vol. 68, No. 4, 

 p. 2. April 10, 1917. 



A small, short-eared species, with its incisors thrown forward. 



Size rather greater than in T. gracilis. General external appear- 

 ance very much as in that animal, except that the color is duller and 

 more drabby, and no dorsal darkening is perceptible. Color of 

 back rather more buffy than " Saccardo's umber"; of undersurface 

 slaty gray broadly washed with buffy, the line of demarcation not 

 defined. Head grayer than back. Ears smaller than in T. gracilis; 

 their color brown, not contrasting strongly with the head; buffy 

 patch below outer base of ear present but not conspicuous. Hands 

 and feet pale brovv^n, with lighter digits; metapodial markings not 

 strongly contrasted. Tail not heavily haired, brown above and be- 

 low. One specimen with a white tip, the other not. 



Skull (pi. 15, fig. 1) decidedly larger than that of T. gracilis, 

 about equaling that of hoeops. Interorbital region comparatively 

 broad, its edges not ridged. Palatal foramina short, ending some 

 way in front of m^ and narrow, not widely open; their median sep- 

 tum broadened and flattened poh.teriorly. Bullae small. 



