1915.] Allen, Review of the South American Sciuride. 269 
Tail with much less black, otherwise similar to igniventris. 
tedifer (p. 272) 
Upperparts with median area from crown to base of tail blackish; underparts 
Pale: BCHPAteMe WW so Boos. ole ee eee cocalts (p. 278) 
Similar in general coloration but much smaller........ zamore (p. 274) 
Upperparts posteriorly washed heavily with reddish; tail as in the igniventris 
group. 
Underparts pale yellowish SSM (Oe Oe )erns, We aig slat een rs pyrrhonotus (p. 275) 
TEIN el a Sle. ee ee sing: Caen uns hgh pie cee castus. (p. 276) 
Upperparts grizzled with pale yellowish and dusky; underparts ochraceous buff. 
langsdorffit (p. 276) 
General coloration above darker, with much more black in the tail; 
BIC RRR oes asl a. cn pe via Se urucumus (p. 278) 
General coloration paler; size larger............. steinbacht (p. 279) 
Urosciurus tricolor (Peppig). 
Text Figs. 10, 16 (pp. 164, 165); Plate X, Figs. 1-3. 
Sciurus tricolor TscHupi (ex Poeppig), Fauna Peruana, I, Therologie, 1844, pp. 
156, 160, pl. xi, animal.— Pappie, in Tschudi, op. cit., p. 157, footnote.— WAGNER, 
Abhandl. K.-B. Akad. Wissen. Miinchen, V, 1850, p. 279.— Tuomas, Ann. and Mag. 
Nat. Hist. (7), VI, p. 187, July, 1900 (mouth of Rio Coco, Upper Rio Negro).— Os- 
coop, Field Mus. Nat. Hist., Zodl., X, No. 12, p. 154, April 20, 1914 (Lagunas and 
Puerto Arturo, Huallaga River, Peru). 
? Sciurus fumigatus Gray, Ann. and Mag. Nat. Hist. (8), XX, Dec. 1867, p. 428 
(“Upper Amazon’’). ‘‘May possibly be referable to S. tricolor, but its determination 
must always remain somewhat doubtful.’’ — Thomas, l. c. 
? Scturus bib isco Gray, Ann. and Mag. Nat. Hist. (3), XX, p. 429, Dec. 
1867. Also ‘‘a member of the present group, but is not like any properly localized 
species I have seen.’”’— Thomas, l. c. 
Type locality.— Maynas, in the angle between the Lower Huallaga and 
the Marajfion. 
Geographic distributtion.— Northeastern Peru. 
Description.— Pelage short, thin and harsh, nearly without underfur; 
ventral surface very thinly clothed. Mamme 8 (not 6 as stated by 
Tschudi). 
Upperparts dark reddish or yellowish brown, the hairs black, slightly 
tipped and subapically narrowly annulated with ochraceous orange or 
‘ochraceous red (in different specimens); top of head blackish, darker than 
the back; front and sides of head orange with a short narrow black nasal 
stripe; fore limbs externally bright rufous, hind limbs dark rufous; under- 
parts and inner surface of hind limbs varying in different specimens from 
rufous to yellowish white; tail above for the basal third black more or less 
erizzled with rufous, rest of upper surface washed with orange, the basal 
