1915.] : Allen, Review of the South American Sciuride. 283 
Type locality— Near Payta, Peru. : 
Geographic distribution.— Northwestern corner of Peru. Recorded from 
Sapotillo (Thomas, l. c.), Tumbez, and Payta. 
Description.— Similar to Simosciurus stramineus stramineus, but colora- 
tion much lighter throughout and with a white nape patch. Upperparts yel- 
lowish gray, passing into pale fulvous on the lower back and extreme base of 
the tail; alarge patch (about 30 mm. square) of yellowish white or clear white 
on the nape, the hairs white to the base; underparts whitish gray, passing 
into white on the throat and (in some specimens) on the inside of the fore 
limbs; fore limbs externally like the back, internally like the ventral surface : 
upper surface of fore feet intense black, with no fulvous wash at the wrists; 
hind limbs externally washed with fulvous like the lower back, increasing 
in intensity at the ankles; upper surface of feet intense black; tail above 
at extreme base more or less suffused with fulvous; rest of the tail (both sur- 
faces) black heavily washed with white, usually faintly tinged with fulvous. 
The above is a description of the coloration in a series of four specimens; 
another specimen varies from this standard in having the lower back more 
strongly washed with fulvous, which increases in intensity on the outer 
surface of the hind limbs. 
Two specimens (adult females) from Marsopon, collected and measured 
by P. O. Simons: total length, 530, 540 mm.; head and body, 250, 265; 
tail vertebree, 280, 275; hind foot, s. u., 60, 62; ear, 36. 39. 
Two skulls from Tumbez: total length, 58.2, 55.5; zygomatic breadth, 
33, 32; interorbital breadth, 19, 19; postorbital breadth, 17, 17; breadth of 
braincase, 22, 22.5; nasals, 18 X 9, 16 X 8; diastema, 14, 13.2; maxillary 
toothrow, 10, 10. 
Specimens examined, 5.— Peru: Marsopon, 2 (Br. Mus.); Tumbez, 3 
(Mus. Comp. Zodl.). 
Remarks.— Differs from true stramineus in lighter coloration through 
the greater length of the light hair tips, both above and below, the absence 
of fulvous or rufous at the wrists, the much paler tint of the suffusion of the 
hind limbs and lower back, and the presence of a large squarish white patch 
on the nape. 
Simosciurus stramineus guayanus (Thomas). 
Sciurus stramineus guayanus THomas, Ann. and Mag. Nat. Hist. (7), V,.p. 150, 
Jan. 1900. 
Type locality— Balzar Mountains, Upper Palenque River, western 
Ecuador. | 
Geographic distribution.— Known only from the type locality, “west of 
Guayaquil,” Ecuador. : 
