neto Rodents from S. America. 251 



Dimensions of tlie type (mcasiucd in the flesh) : — 



Head and body loO mm.; tail 190; hind foot 31; 

 ear 17. 



fc^kull : greatest length 37*3 ; condylo-incisivc lengtli 33"7 ; 

 greatest breadth 18'7 ; nasals 13*8 ; interorhital breadth 6'2 ; 

 breadtii of brain-case 15; paiatilar length 16; palatal 

 foramina Ci'dx 3'2 ; upper molar series G*2. 



Ilah. Canelos, Rio Bobonaza, Oriente of Ecuador. Alt. 

 2100'. 



Type. Adult female. B.M. no. U. 7. 19. 12. Ori<rinal 

 number 109. Collected 28th April, 1910, by M. G. Palmer. 



This species has not the general appearance of the more 

 ty])ical members of Gicomys, but its broad feet with long 

 fifth toe, laroe brain-case, and the reduction of its anterior 

 zygomatic plate all indicate that it belongs to that group 

 rather than to Oryzomys. In size, as judged by length of 

 skull, it considerably exceeds any species as yet described. 



CEcomys palmer i, sp. n. 



Like CE. siijyerans, but smaller and darker-coloured. 



Size about as in the other large species of t!ie genus, 

 decidedly smaller than in CE. superans. Colour darker than 

 in that animal^ the upper surface sepia-brown, with only 

 slight indications of huffy along the flanks. Under surface 

 grey no. 9, the hairs slaty for their basal, whitisli for their 

 terminal halves. Hands and feet pale brown, the scutel- 

 lations, as in ffi". superans, more cons])icuou3 than in most 

 species. Tail of medium length, thinly haired, very finely 

 scaled (rings 19-20 to the cm.), paler brown, indistinctly 

 mottled with whitish. 



Skull less bowed than in superans ; ridges proportionally 

 more developed ; ^lalatal foramina and parapterygoid fossse 

 narrower. Molars smaller, narrower, the series quite parallel, 

 not curved out anteriorly. 



Dimensions of the type (measured in flesh) : — 



Head and body 131 mm.; tail 156; hind foot 30; 

 ear 15. 



Skull : greatest length 33"4; condylo-incisive length 30*3; 

 greatest breadth 17; nasals 11*1; interorhital breadth 6; 

 breadth of bntin-case 14 ; paiatilar length 15; palatal fora- 

 mina G"2 X 2'-l: ; upper molar series 5'6. 



Hub. Canelos, Oriente of Ecuador. Alt. 2100'. 



Type. Adult male. B.M. no. 11. 7. 19. 13. Original 

 number 170 A. Collected 28th April, 1910, by M. G. Palmer. 



This species agrees in general characters with CE. superans, 



