606 On new Suhsjyecies o/Metacliirus. 



brownish general colour, in addition to tlie reduction or 

 absence of the white on the tail. The present form, coming 

 from the liiglier ground towards the Andes, agrees witli it 

 in the latter character, but tlie body-colour is practically as 

 bright and rich as in colomhianus to the north or tschudii 

 from further south in Peru. 



Metachirus nudicaudatus infiiscus, subsp. n. 



Most nearly related to M. n. hoUvianus, Allen, with which 

 it shares the blackish dorsal line, but the general colour is 

 very much darker, darker in fact than in any other sub* 

 species of M. nudicaudatus. While the sides of the back, 

 outside the blackish median area, are in holivianus buffy 

 greyish, they are here approximately ^' mummy-brown," 

 succeeded below by dull tawny on the flanks. Under surface 

 buffy, strongest on the throat and edges of the belly. Cheeks 

 and supraocular spots ochraceous, the dark line between eye 

 and ear fairly well marked. Hands and feet dark brown, 

 the digits scarcely paler. Tail brown with about 3 inches at 

 the end white, the junction of the two colours quite irregular. 



Dimensions of the type (measured on the skin) : — 



Head and body 240 mm. ; tail 260; hind foot 38. 



Skull : condylo-basal length 50; ms^'^ 8*6. 



Bah. Inambari River, Peru. 



T(/pe. Adult male. B.M. do. 2. 7. 27. 8. Collected by 

 G. Ockenden. One specimen. 



Distinguished from holivianus by its much darker general 

 colour, browner feet, and the lesser extension of white on the 

 tail. The size of the single skull is also less than is usual in 

 the group. 



Metachirus nudicaudatus modestuSj subsp. n. 



A dull greyish race almost without the rufous or fulvous 

 tones found in other subspecies. 



General colour above drab-grey, without darker median 

 line on the back, and with scarcely any fulvous suffusion. 

 Flanks slightly more fulvous, but far less so than in the 

 Brazilian M. 7i, myosuros. Under surface uniform buffy, the 

 hairs buffy to the roots. Throat but slightly more ochra- 

 ceous. Supraocular spots sharply defined, nearly white. 

 Cheeks buffy. Crown strongly black, and tlie line between 

 eye and ear also black. Hands brown to the metapodials ; 

 fingers and whole of hind feet whitish. Tail nearly ail 

 white, the basal four inches only irregularly brown above. 



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



Head and body 255 mm.; tail 315; hind foot 40 ; ear 37. 



Skull : condylo-basal length 56; nu^-^ 9'5. 



