E. LÖNNBERG, MAMMALOGY OF ECUADOR. 29 



which are not carnivorous f. i. Bradypus. Such a shortening 

 may thus be suitable for animals with arboreal habits. 

 During the adaptation to a frugivorous, or in any case not 

 carnivorous diet the size and shape of the ieeth bas altered, 

 and this together with the shortening of the jaws may be 

 the reason why the dentition of these Kinkajous displays 

 such an unstable variation with regard to the size of their 

 molariform teeth. 



Bassaricyoii gabbii mediiis Thomas. 



1 c?, Vi 1920, Gualea, 5,000 feet altitude. 



This fine specimen differs widely with regard to the 

 shape of the skull and teeth from the flat-headed B. alleni 

 which Thomas described 1880^ from the eastern side of the 

 Andes in Ecuador, Sarayacu. It belongs to the B. gabbii 

 group with more convex före head. Thomas named a member 

 of this group from »mountains inland of Choco, Western 

 Colombia», B. medius. From a geographical point of view, 

 there appears to be no difficulties for an identification with 

 this species. Some discreprancies in colouration may be due 

 to individual variation. The cranial dimensions recorded by 

 Thomas for B. medius are very similar to those of the pre- 

 sent specimen which latter has the skull about 3 mm longer 

 than the type of B. medius, perhaps because it is a male, the 

 upper tooth-row measured from the canine is also corre- 

 spondingly longer, but the breadth measurements are not 

 greater. 



The hairs of the upper side are basally rather dark 

 greyish brown, then broadly ringed with shiny yellowish buff 

 and tipped with dark brown. Thus a very Po^o5-like colo- 

 ration is produced. The tail is more brownish with dark 

 rings. The hands are dark brown, the feet are also brownish, 

 but not so dark. 



It is possible that these differences are constant, in which 

 case there might be reason to discern a geographic race in 

 western Ecuador, but for the present it appears the best to 

 call it medius. The present author is also inclined to accept 



^ Proc. Zool. Soe. p. 397. 



' Ann. Mag. N. H. (8) IV, p. 233. 



