1915.] Allen, Review of the South American Sciuride. 281 
With no nuchal white*patch. 
Upperparts dark, washed with yellowish gray; underparts dark brown. 
stramineus (p. 281) 
Upperparts pale, underparts dark brown washed mesially with gray. 
guayanus (p. 283) 
Simosciurus stramineus stramineus (Hydoux and Souleyet). 
Text Fig. 12 (p. 164); Plate XII, Figs. 1-3; Plate XIV, Figs. 5, 6. 
Sciurus stramineus Eypoux and SouLEYET, Voy. Bonite, Zool., I, 1841, p. 78, 
pl. ix.— TscHup1, Fauna Peruana, Therologie, 1844, p. 159.— Aston, Proc. Zool. 
Soc. London, 1878, p. 664 (part).— Anten, Bull. U. S. Geol. and Geogr. Surv. 
Territories (Hayden), IV, No. 4, p. 888, Dec. 11, 1878.— THomas, Ann. and Mag. 
Nat. Hist. (7), V, pp. 150, 151, Jan. 1900 (in text). 
Sciurus hypopyrrhus ALLEN (not of Wagler), Mon. N. Amer. Rodentia, 1877, 
p. 746 (part, only the Guayaquil specimens). 
Macroxzus frasert Gray, Ann. and Mag. Nat. Hist. (8), XX, p. 480, Dec. 1867. 
Ecuador. (Cf. Thomas, /. c., p. 150). 
Type locality — Omatope, Peru. 
Geographic distribution.— Western slope of the Andean region of north- 
western Peru and southwestern Ecuador. 
Description.— Pelage full, rather coarse, with abundant underfur; tail 
narrow and long. Mamme 8 (variable in different specimens, the full 
number not always being functionally developed). Very variable in colora- 
tion through purely individual differentiation. 
Upperparts (an average specimen from Guayaquil), hairs deep black 
for the basal seven eighths, narrowly tipped with pale yellowish gray on the 
nape, shoulders, front half of the dorsal region and sides of body; lower 
back, rump, and basal sixth of tail with the hairs broadly tipped with dark 
rufous; top of head and nose black, the hairs minutely punctated with 
rufous; sides of head dull hazel with a-blackish wash; underparts dark 
rusty brown, with whitish hair tips over the median area; fore limbs ex- 
ternally with the hair tips pale rufous, deepening to clear rufous at the carpus 
and base of metacarpals, passing into black on the toes; fore limbs internally 
like the ventral surface, passing into dark rufous at the carpal joint; hind 
limbs externally like the lower back and base of tail, the feet black slightly 
varied with dark rufous proximally; tail at extreme base (both above and 
below) mixed dark chestnut and black; rest of the tail black washed with 
white, the hairs black with white or pale yellowish white tips. 
Two other Guayaquil specimens differ from the above in having the 
posterior half of the dorsal area, hind limbs, and base of tail chestnut rufous, 
and the underparts much darker — brownish black with the hair tips 
