210 Bulletin American Museum of Natural History. [Vol. XXXIV, 
being strongly instead of moderately convergent anteriorly; ratio of breadth 
of skull at m! 49% of the total length instead of 57% as in estuans, or 53% 
as in hoffmanni; malar of nearly even width, and nearly straight instead of 
having a well developed superior process and a marked depression behind it; 
molars and other cranial features nearly as in estuans. (As the type skull 
is somewhat immature, allowance is made for slight change in form through 
growth.) cies 
Geographic distribution Known only from the type locality of the single 
.known species. : 
Remarks.— The distinctive feature of the present genus is the striking 
character of the plantar surface of the hind feet, which renders it at once 
distinguishable from all other genera. The very short rostrum, the narrow- 
ness of the skull at the front border of the orbits and the form of the malar 
bone serve to distinguish it also from Leptoscourus, Guerlinguetus, and Meso- 
ScwUurUs. 
Notosciurus rhoadsi Allen. 
Sciurus irroratus STONE, Proc. Acad. Nat. Sci. Philadelphia, 1914, p. 14 (not of 
Gray). 
Notosciurus rhoadsi AuLEN, Bull. Amer. Mus, Nat. Hist., X XXIII, p. 585, Oct. 
8, 1914. 
Type locality — Pagma Forest, Chunchi, Ecuador; altitude 6300 feet. 
Geographic distributcon.— Known only from the type locality. 
Description.— “Character of the pelage and coloration nearly as in 
Guerlinguetus hoffmanni, but ears relatively long and narrow, and the proxi- 
mal half of the soles of the hind feet heavily furred. 
_ “Upperparts uniformly finely grizzled pale yellow and dusky, the hairs 
individually blackish basally and narrowly ringed near the tip with pale 
yellow and black, mixed sparingly with hairs wholly black, resulting in a — 
pale yellowish brown general effect; underparts ochraceous orange, paler 
on the chin, throat and sides of nose; limbs externally like the upperparts, 
and internally like the belly, the feet grizzled with pale orange; ears rufous, © 
well haired on both surfaces; tail grizzled on both surfaces like the back, 
the tips of the hairs pale orange, the hairs individually narrowly ringed 
alternately with yellowish buff and black, the undersurface of the tail 
with a submarginal, rather narrow band of black and long ochraceous tips. 
“Total length (collector’s measurements), 330 mm.; tail vertebra, 152; 
hind foot, 50; ear, 20. 
“Skull, total length 47; zygomatic breadth, 27; interorbital breadth, 15; 
postorbital breadth, 13; breadth of braincase, 22.5; nasals, 14 < 7; dias- 
tema, 11; maxillary toothrow, 8. The skull still retains the milk premolars, 
