60 On new Nasua, Lutra, and Proechimys. 



Dimensions of tlie type (measiired in flesh) : — 



Head and body 570 mm. ; tail 423 ; hind foot 10.2 ; 

 ear 17. 



Skull : condylo-basal length 102 ; zygomatic breadth 64 ; 

 nasals, length on middle line 12*5, least breadth 5"5 ; 

 interorbital breadth 19'7 ; tip to tip of postorbital pro- 

 cesses 23'5 ; mastoid breadth 63 ; combined breadth of 

 incisors 11*3 ; p*, length on outer edge 13, front angle to 

 back of inner lobe 11. 



Hab. Western Ecuador. Type from St. Juan, 15 miles 

 W. of Huigra. Alt. 870'. 



2ype. Subadult female. B.M. no. 14. 4. 24. 15. Original 

 number 210. Collected 12th August, 1913, by Gilbert 

 Hammond. Presented ])y Oldfield Thomas. 



This otter is most nearly allied to the Merida L. emerita, 

 but differs by its more angularly projected nose-pad, its 

 narrower interorbital region, and its slightly larger car- 

 nassial. 



Proechimys centralis colombianus, subsp. n. 



Essential characters of P. centralis ; hamular process 

 broadly spatulate as in that species, not narrow as in 

 P. xanthceolus. 



General colour above dark fulvous chestnut, rather richer 

 and more rufous than in P. c. chiriquinus ; quite diflFerent 

 from the pale and more sandy colour of P. c. panamensis. 

 Head and back heavily lined with black. Under surface 

 pure sharply defined white. Hands and feet uniformly pale 

 brown. Tail heavily haired, black above, rather paler below, 

 but not strongly contrasted. 



Skull most like that of P. c. panamensis, agreeing with it 

 in the tendency to the occasional obsolescence of the middle 

 part of the parietal ridges, and thus resembling P. xantha- 

 olus. In P. c. chiriquinus, on the other hand, the ridges are 

 heavily developed throughout. Supraorbital ledges broad, 

 but not so thickened as in P. c. panamensis, Hamular 

 processes of pterygoids broadly spatulate. 



Dimensions of the type (measured in the flesh) : — 



Head and body 260 mm. ; tail 160 ; hind foot 51 ; 

 ear 23. 



Skull: greatest length 59'7; condylo-incisive length 48'5 ; 

 zygomatic breadth 26*5 ; nasals 22, tip of nasals to back 

 of premaxillary processes 20*5, interorbital breadth 13"5, 

 greatest breadth on ridges 23; interparietal 8*2 x 11*8; 

 palatilar length 21*7 ; breadth of hamular processes 2'2 ; 

 cheek-tooth series 10. 



I 



