1915.] Allen, Review of the South American Sciuride. 229 
oration, but with the pelage much longer and softer; fluffy, fulvous, post- 
auricular patches strongly developed; underparts deeper orange red, with a 
tendency to pure white axillar and inguinal patches, with sometimes a white 
median line; upper parts decidedly paler, the general tone an olivaceous 
gray, the annulations at the tips of the hairs clay color instead of yellow to 
ochraceous. 3 
Total length (6 specimens, 3 males, 3 females, Sierra de Merida, topo- 
types, measured by the collector), 395 (880-410); head and body, 213 (190- 
220); tail vertebree, 182 (170-190); hind foot (s. u.) 50. 
Four specimens from Paramo de Tama (S. g. tame Osgood): “Total 
length, 396 (385-416); head and body, 216 (209-223); tail vertebrae, 180 
(176-193); hind foot (c. u.) 54 (53-55).”’ — Osgood, l. e. 
Skull (6 specimens, Sierra de Merida, same specimens as above), total 
length, 50.7 (48.5-52); zygomatic breadth, 29.4 (29-30); interorbital 
breadth, 15.9 (15-16.2); breadth of braincase, 23.3 (23-24); length of nasals, 
16.2 (15.6-17); diastema, 12.4 (12-13); maxillary toothrow, 8.8 (8.3-9.2). 
The S. g. tame series (3 skulls), total length, 52 (51-52.5); zygomatic 
breadth, 30.3 (30-30.5); interorbital breadth, 16 (15.8-16.2); breadth of 
braincase, 23.3 (23-24); diastema, 12.1 (11.5-13); maxillary toothrow, 
8.3 (8-8.6). : 
Specimens examined, 57.— Venezuela: Escorial, Sierra de Merida, 4, 
type and 3 others (Br. Mus.); same locality, 10 (Nat. Mus.); same locality, 
38 (Am. Mus.); Paramo de Rosas, near Guarico, 1 (Am. Mus.). Colombia: 
4 (type and 3 topotypes of S. g. tame) Paramo de Tama, Colombia-Venezuela 
boundary (Field Mus.). 
Remarks.— Guerlinguetus griseogena meridensis is the interior mountain 
form of G. g. griseogena of the northern coast mountains of Venezuela, from 
which it differs in the greater length and softness of the pelage, and the better 
development of the fluffy postauricular patches. The paler color of the 
upperparts and the deeper, redder tone of the ventral surface are additional 
features of differentiation, as are also the frequent development of patches of 
pure white on the ventral surface. These patches are very irregular as to 
size and shape; they are mainly inguinal and axillary in position, but appear 
also on the median line as small, more or less linear spots, which occasionally 
develop so as to form a continuous broad median line of white. In 33 speci- 
mens of typical griseogena only one is marked with white below, and this 
merely shows a tendency to whiteness at the axillee. In a series of 12 well- 
made topotype skins of meridensis, from the Escorial de Merida, only 2 are 
prominently marked with white on the ventral surface. In a series of 26 
flat skins (hunter’s pelts) from Merida, bought by the American Museum 
of the Brincefiio brothers with other natural history material, 15 have more: 
