new South-American Mammals. 193 
20 millim. in length), the belly-hairs plumbeous_ basally 
below their vivid fulvous-rufous tips, the separation of the 
belly from the body-colour less sharply defined, and the ears 
edged with bright rufous. Patch behind base of ears dull 
yellowish. 
Dimensions of the type (measured in skin) :— 
Head and body 220 millim.; tail 220; hind foot, s. u. 48, 
Gusta seeat 20. 
Skull: greatest length 52; basilar length 39; greatest 
breadth 30°53 nasals 16x 7°3; interorbital breadth 15:4; 
palate from heuselion 23; diastema 13; length of upper 
tooth-row (crowns) 8°7. 
Hab. Escorial, Sierra de Merida. Alt. 2500 m. 
Type. Male. B.M. no. 98. 7. 1.33. Collected 16th No- 
vember, 1896, by S. Briceiio. 
This is evidently simply a highland form of S. griseogena, 
of which the type came from “ Venezuela.” 
Scturus (Microsciurus) otinus, sp. n. 
Similar to S. (JL) isthmius, Nels., in all respects exter- 
nally, except that the ears, instead of being like the crown 
(or rather more ferruginous) on both surfaces, are internally 
blackish towards their edges, and externally are 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 S. ¢sthmdus, 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. 
Do, Cre. oO ear fe: 
Skull: tip of nasals to front of interparietal 33°35 zygo- 
matic breadth 22°7; nasals 10 (diagonally) x 5:1;  inter- 
orbital breadth 13°35; diastema (to p.') 8:9; palate from 
henselion 14°2; combined length of large premolar and three 
molars 5:1. 
Hab, Medellin, Colombia. 
Type. Female. B.M. no. 76. 8. 8. 6. Collected by 
Mr. 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. 
