> 
SCIURUS. 
bs, ack dark chocolate . 2. s..0.-..° S. melania 
f.° Belly white. 
a.° Ear tufts present, whitish; back 
gray or yellowish gray..... S. yucatanensts 
b.° Ear tufts absent. 
a.’ Ears bordered with black. 
a.’ Back very dark, lateral line 
reddish, ear patches rusty. ..S. boothie 
b.* Back grayer, no lateral line; 
ear patches very large, 
Ck A= ae Ra Nec age S. goldmant 
b.’ Ears not bordered with black. 
a.” Back gray. 
a.” Size large; total length 
about 570 mm.; _ back 
uniform; no lateral line....S. griseus 
b.* Size medium, total length 
about 485 mm.; median 
dorsal area rufous; lat- 
eral line black ........... S. durangi 
b.* Back yellowish. 
a.’ Ears pale rusty; flanks 
SRE NSARM Sey 20 Fes vclaxe a, ai? S. truu 
b.* Ears dull rusty; flanks 
washed with whitish... S. sinaloensts 
c.° Back yellowish gray, coarsely 
grizzled with black. 
a.’ Ears gray; yellowish of 
back dull, sometimes 
VeLy INGIShiMeh <3 oF yen S. collier 
b.* Earsrusty; yellow of back 
brighter, more buffy...S. ¢. nuchalis 
“ Belly not blackish or white. 
a. Belly buffy. 
a.° Back with median area blackish 
or dark brown, rest of body 
RRR hee ak Stas he OEE et FS S. a. dorsalis 
b.° Back with median area not 
blackish. 
a.’ Ears black-edged ........ S. variegatoides 
b.’ Ears not black-edged ....S. managuensis 
b. Belly rufous. 
130 
130 
| NL. 
123 
I22 
I21I 
I22 
127 
129 
129 
