new South-American Mammals. 193 



20 niillim. in loiigtli), the belly-liairs plumbooud basally 

 below their vivid tulvoiH-nifoiH tips, the separation of the 

 l»elly tVom the body-colour lens sharply defined, and tlic ears 

 edged with bright rufous. Patch behind base of ears dull 

 yellowish. 



Dimensions of tln^ type (measured in skin) : — 



Head and body 220 niillini. ; tail 220; hind foot, s. u. 48, 

 c. u. 52 ; car 20. 



Sknll : greatest length 52; basilar length ;{9 ; greatest 

 breadth 305; nasals 16x7*3; interorbital breadth 15"4 ; 

 palate from henselion 23; diastema J3; length of upper 

 tooth-row (crowns) 8*7. 



Hah. Escorial, Sierra de Merida. xVlt. 2500 m. 



T>/pe. Male. B.M. no. 98. 7. 1. 33. Collected 10th No- 

 vember, 189G, by S. Brieouo. 



This is evidently simply a highland form of S. yriseogena^ 

 of which the type came from " Venezuela." 



Sciurus [Microsciurus) otinus, s\). n. 



Similar to S. (J/.) istlimius, Nels., in all respects exter- 

 nally, except that the ears, instead of being like the ciown 

 (or rather more ferruginous) on both surfaces, are internally 

 blackish towards their edges, and externally arc white, con- 

 trasting markedly with the general colour. Their extreme 

 edge, however, is black, the white hairs having fine black 

 tips. Orbital rings scarcely perceptible. Caudal hairs 

 ringed with black and pale yellow, their tips yellowish white. 



Nasals of about the same length as in 6'. isthmius, but their 

 posterior edge, instead of forming a round-angled W, is 

 shaped like an open inverted V — A — the lines of the A being 

 continuous behind with those bounding the premaxillary pro- 

 cesses posteriorly. Incisors of the usual size. 



Dimensions of the type (in skin) : — 



Head and body 130 millim. ; tail (c.) 112 ; hind foot, s. u. 

 33, c. u. 36 ; ear 13. 



Skull : tip of nasals to front of interparietal 33*3 ; zygo- 

 matic breadth 22*7; nasals 10 (diagonally) x5"l; inter- 

 orbital breadth 13*3; diastema (to p.*) 89; pahitc tVom 

 henselion 14'2; combined length of large premolar and three 

 molars 5*1. 



JJa/j. Medellin, Colombia. 



Ti/2)e. Female. B.M. no. 76. 8. 8. 6. Collected by 

 ^Ir. J. K. Salmon. Two specimens examined. 



In the second specimen the ears are not so markedly white 

 as in the type, but the cranial characters are quite similar. 



