SCIURUS., 127 
NICARAGUA SQUIRREL. 
Type locality. Realejo, Nicaragua. 
Geogr. Distr. Lowlands on west coast of Nicaragua, 
Genl. Char. WUairs of back coarse, stiff, shiny; under fur short, 
Color. Upper parts and upper portion of thighs, dark brown, 
washed with grayish; flanks paler; crown iron gray; cheeks, sides of 
neck, and nape grayish brown; under parts, arms, part of shoulders, 
and inside of thighs dark reddish chestnut; chin, throat, axillar 
region, and between hind legs white; tail above black washed with 
white, beneath rusty brown bordered with black and edged with 
white; hands and feet grizzled chestnut; ears iron gray, with white 
patches at base. 
Measurements. Total length, 440; tail vertebra, 199; hind foot, 65. 
a.—dorsalis (Sciurus), Gray, Proc. Zodl. Soc., 1848, p. 138. 
rigidus Peters, Monatsb. K. Preuss. Akad. Wiss. Berlin, 1863, 
D, O52, 
intermedius Gray, Ann. Mag. Nat. Hist., 3d Ser., xx, 1867, p. 421. 
nicoyana Gray, Ann. Mag. Nat. Hist., 3d Ser., xx, 1867, p. 423. 
boothie Allen, Mon. N. Am. Rodent., 1877, p. 741. (Part. Costa 
Rica specimens.) 
hypopyrrhus Allen, Mon. N. Am. Rodent., 1877, p. 746. (Part. 
West Costa Rica specimens.) 
BANDED-BACK SQUIRREL. 
Type locality. Liberia, Costa Rica nec Caracas, Venezuela. 
Geogr. Distr. Western Costa Rica, Alajuela to Liberia, Peninsula 
of Nicoya, and possibly adjacent parts of Nicaragua. 
Genl. Char. Tail long, narrow; colors brighter than those of S. 
adolphei. Hairs coarse, stiff. 
Color. Dorsal band from nape to tail blackish to grizzled yellow- 
ish brown; sides grayish; crown and sides of head paler than back; 
under parts, arms, legs, hands, and feet varying from white or yellow- 
ish to rufous; chin, cheeks, and sides of neck grizzled gray to grayish 
brown; tail above black, washed with white, beneath dark rufous 
to rusty orange, or grayish white bordered by black and edged with 
white; ears grizzled gray or brown, with black border, and basal 
white patches. This is a very variable species and has several color 
phases, individuals presenting quite a different appearance from each 
other. 
Measurements. Total length, 510; tail vertebra, 248.5; hind foot, 
62.2. Skull: average of two; basal length, 51.7; palatal length, 27.7; 
interorbital width, 21.8; zygomatic width, 35.2; length of upper 
molar series, 11.7. 
