1915.] Allen, Review of the South American Sciuride. 277 
Sciurus variabilis var. langsdorffit Cops, Amer. Nat., Feb. 1883, p. 135 (Chapada, 
Matto Grosso). 
[ype locality.— “ Brasilia” = Cuyabé, Matto Grosso, Brazil. 
Brandt, in describing langsdorffii, gave no definite type locality. Wagner 
(1850, J. c.) found that Natterer’s specimens from Cuyabé, Matto Grosso, 
were like Brandt’s type, and restricted the name langsdorffii to the Matto 
Grosso form. Later Thomas (1903, /. ¢.) confirmed this action, stating 
that a series of specimens from Chapada (only a few miles from Cuyaba), 
Matto Grosso, represents “the true S. langsdorffiz.” Cuyaba, Matto Grosso, 
may therefore be taken as the type locality of the species. 
Geographic distribution.— Southwestern Brazil (Matto Grosso). Bound- 
aries of range not known. 
Description..— Upper surface of head grizzled yellowish rufous and 
black, front and sides of head nearly clear rufous; upperparts of body from 
nape to rump grizzled yellowish and dusky, the hairs dusky with pale: 
yellowish tips; rump and basal fourth to third of tail grizzled dark rufous 
(or chestnut) and black; underparts nearly uniform ochraceous buff, in 
some specimens with a narrow line of small spots of white on the chest; 
fore limbs and feet externally grizzled pale yellow and dusky, internally 
orange buff, deeper colored than the ventral surface; hind limbs externally 
reddish chestnut, feet paler; upper surface of tail for basal third grizzled 
rufous and black, more or less in contrast with the back; rest of the tail 
above orange, the hairs black at base with long orange tips, the black show- 
ing through when the hairs are disarranged; lower surface of the tail similar 
to the upper, the hairs black basally and tipped with orange, the black not 
wholly concealed and in some specimens strongly visible on the median 
line of the proximal half. | 
External measurements of 2 Chapada specimens are as follows: Total 
length, 510, 504 mm.; head and body, 260, 250; tail vertebree, 257, 254; 
hind foot (dry skin), 55, 56. 
Skull (8 specimens, Chapada), total length, 62 (60.8-64); zygomatic 
breadth, 36.4 (35-38); interorbital breadth, 20.4 (20-21); postorbital 
breadth, 18.9 (18.5-19); breadth of braincase, 23.8 (23.3-24.3); nasals, 
18.5 X 8.3 (17.3-19 X 7.8-8.7); diastema, 18 (17.5-19); maxillary tooth- 
row, 9.8 (9.3-10). 
Specimens examined, 16.— Brazil: Chapada, Matto Grosso, 15 (Nat. 
Mus., 4; Acad. Nat. Sci. Philadelphia, 10, Am. Mus. 1, coll. H. H. Smith) ; 
“South America,” 1 (Nat. Mus.). 
1 Based on Chapada, Matto Grosso, specimens, collected by H. H. Smith. 
