122 SCIURUS. 
and feet whitish; orbital ring whitish; ears yellowish brown, with 
whitish basal patches; flanks and shoulders on sides gray; under 
parts white; tail at base all around like back, remaining portion 
above black, washed with white, beneath grizzled black and yel- 
lowish gray, or black, gray, and yellowish brown, bordered narrowly 
with black and edged with white. 
Measurements. Total length, 508; tail vertebre, 265; hind foot, 
65. Skull: average of four; basal length, 49; palatal length, 25.6; 
interorbital width, 18.4; zygomatic width, 32.6; length of upper 
molar series, II. 
a.—nuchalis (Sciurus), Nelson, Proc. Wash. Acad. Scien., 1, 1899, 
Pp. 59. 
MANZANILLO SQUIRREL. 
Type locality. Manzanillo, State of Colima, Mexico. 
Geogr. Distr. From State of Michoacan to Bay of Banderas, 
State of Jalisco, Mexico, and inland to mountains near San Sebastian 
in the same State, below 3,000 feet. 
Genl. Char. Like S. collig1, but ears rusty rufous; nape and 
shoulders buffy yellow; rump washed with black. 
Color. Above yellowish gray, lower part of back and rump 
washed with black; nape mixed with black; crown like nape; ears 
rusty rufous, with rusty white basal patches; cheeks and sides of 
nose yellowish brown; orbital ring yellowish; flanks gray, paler than 
back; outside of arms, hands, and feet iron gray; shoulders washed 
with gray; under parts white; base of tail like back, remainder 
above black washed with white; beneath grizzled reddish yellow, 
bordered with black and edged with white. 
Measurements. Total length, 525; tail vertebre, 272; hind foot, 
71. Skull: average of five; basal length, 52.3; palatal length, 27.6; 
interorbital width, 20.6; zygomatic width, 35.9; length of upper 
molar series, 11.4. 
84. sinaloensis (Scirus), Nelson, Proc. Wash. Acad. Scien., 1, 1899, 
p-.00- 
SINALOA SQUIRREL. 
Type locality. Mazatlan, State of Sinaloa, Mexico. 
Geogr. Distr. Southern and central parts of the State of Sinaloa, 
Mexico, below 2,500 feet. 
Genl. Char. Similar to S. colliei, but paler. 
Color. Crown and rest of upper parts pale reddish yellow mixed 
with black; nose and forehead grizzled yellowish gray; sides of neck, 
shoulders, flanks, arms, legs, hands, and feet grayish white; orbital 
ring and side of nose gray; cheeks yellowish brown; ears yellowish 
