SCIURUS. 97 
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bo Back dark chocolate .....5... 0. S.melania 128 
f° Belly white. 
a.° Ear tufts present, whitish; back 
gray or yellowish gray..... S. yucatanensis 125 
b.° Ear tufts absent. 
a.’ Ears bordered with black. 
a.° Back very dark, lateral line 
reddish, ear patches rusty...S. boothie 128 
b.* Back grayer, no lateral line; 
ear patches very large, 
WALI a wheaeracet bie ation ein 6 S. goldmant 130 
b.’ Ears not bordered with black. 
a.” Back gray. 
a.” Size large; total length 
about 570 mm.; back 
uniform; no lateral line....S. griseus 130 
b.’ Size medium, total length 
about 485 mm.; median 
dorsal area rufous; lat- 
Sral tine lacie, yo. os aes S. durangi 112 
b.* Back yellowish. 
a.’ Ears pale rusty; flanks 
IVER OV: 1(c iain a ane ea eae ae ar S. wuu 123 
b.” Ears dull rusty; flanks 
washed with whitish... S. sinaloensis 122 
c.* Back yellowish gray, coarsely 
grizzled with black. 
a.” Ears gray; yellowish of 
back dull, sometimes 
VERY AMCISTUMCH cares wo wu S.colli@t 121 
b.” Earsrusty; yellow of back 
brighter, more buffy...S.c. nuchalis 122 
e.* Belly not blackish or white. 
a.” Belly buffy. 
a.° Back with median area blackish 
or dark brown, rest of body 
{ODIO ai tse a ora ome Le ee S..a@..d@orsalis’ 127 
b.° Back with median area not 
blackish. 
a. Bars black-edged oi... 1..).. S. variegatoides 129 
b.’ Ears not black-edged ....S. managuensis 129 
b.* Belly rufous. 
