96 
SCIURUS. 
b’. Back dark gray; top of head 
iron gray or blackish...... S.a. hypopyrrhus 
b.* Ribs and shoulders not rufous. 
a.” Back dingy whitish; nape patch 
TUSEV Sy cithenteMine med sae. ten neuen S. socialis 
b.° Back bluish gray in middle, re- 
mainder sooty brownish......... S.n. hirtus 
b.’”’ Feet white. 
a.“ Back whitish, rump and nape 
patches very bright: «53.1 ey <1 ss 0 owe S. s. cocos 
b." Back gray. 
a.” Nape patch strongly marked, 
Garke WOUS 5 a nent eaemes ras eae S. p. effugius 
b.° Nape patch not strongly marked, 
Pushy yellowish 2h ocak. ga0 oy vou san S. poliopus 
b.’ Nape and rump patches absent or not 
well defined. 
a.” Nape and 1ump patches not well defined. 
a.” Back dark gray, sparingly or not at 
all mixed with yellowish hairs. 
a.‘ Back and under side of tail dark 
iron gray; feet gray..........<.5. p. cerutcalts 
b.* Back and under side of tail paler 
pray: feet whiteye iis tows qae as S. p. nemoralis 
b.’”” Back pale gray mixed with yellowish 
hairs; feet white. 
a? Belly swine Sieg sk tet aaa S. p. hernandesz’ 
Bb. (Bellyaitious..c. sao eke tires ate akan S. poliopus 
b.’” Nape and rump patches absent. 
a.’’”" Back with broad median band of 
blackish; rest of body whitish...... S. a. dorsalis 
b.’” Back without broad median band 
of blackish. 
a.‘ Belly pale gray; back coarsely griz- 
zled gray or yellowish gray...... S. yucatanensis 
b.* Belly dark iron gray; back blackish 
gray suffused: with but... 9.945. S. y. baliolus 
c.' Belly bright ferrugineous; back yel- 
low ferrugineous or blackish brown. .S. v. morulus 
d.* Belly blackish or white. 
e.° Belly blackish. 
a.” Back sooty blackish grizzled 
with yellowish tRy cera. sas? S.nelsont 
PAGE 
I16 
123 
I21 
124 
I20 
117 
11g 
Irs 
se 
HOH 
“1 oO 
199 
125 
126 
105 
I20 
