SCIURUS. 99 
premaxille very heavy; malar broad and expanded vertically; post- 
palatal notch only a trifle posterior to last molar.’’ (Nelson.) 
Fic. 13. SciuRUS (MICROSCIURUS) BROWNI. 
No. togo4 Mus. Comp. Zool. Nat. Size. 
KEY TOebn Eb See Chis OF THE SUBGENUS: 
A. Size small; tail slender, round. PAGE 
a. Upper parts dusky olivaceous, finely grizzled 
iE, re MOMNARIA MUISUNS cts an pisthse foe Gd donnie wah ace eke S. aljart 99 
b. Upper parts tawny olive and bistre............. S. brownt 100 
c. Upper parts olivaceous brown, shaded with 
PeeWee artes Fw Eys oie R Me. aki 2 ad ate S. boquetensts 100 
68. alfari (Sciurus), Allen, Bull. Amer. Mus. Nat. Hist., 1895, p. 333. 
ALFARO’s PiGMy SQUIRREL. 
Type locality. Jimenez, Costa Rica, Central America. 
Geogr. Distr. Northern, eastern, and southwestern Costa Rica. 
Genl. Char. Size very small; ears short, rounded; pelage soft, 
dense; tail slender, much shorter than head and body. 
Color. Upper parts and outer sides of arms, legs, hands, and feet 
dusky olivaceous, finely grizzled with yellowish rusty; top of head 
and narrow orbital ring rufous; chin, throat, breast, and inner side of 
arms pale ferrugineous shading into dark brown; middle of belly and 
inner side of thighs varving from fulvous gray to rufous; tail like 
back at base, remainder above and beneath grizzled dark reddish 
brown and black, tip black; hairs of under surface of tail reddish 
brown or chestnut, encircled with three bands. 
