1915.] Allen, Review of the South American Sciuride. 217 
orange yellow, varying in different specimens from dull yellow to orange 
red; chin and throat fulvous gray, paler than the rest of the ventral surface; 
tail at base, both above and below, like the back; rest of the upper surface 
of tail with the hairs at base annulated with buffy gray and black, followed 
by a broad zone of black and broadly tipped with orange, varying in different 
specimens from pale orange to orange red; tail below with the middle 
area grizzled yellowish brown and black, the sides and tip broadly edged 
with the same shades of orange or red as the upper surface; tail tipped 
normally with orange with the subapical black zone showing through the 
surface color,— not normally tipped with black as in griseogena. Ears 
rather long and pointed, dusky or blackish on the apical third posteriorly, 
and fulvous or rusty buff at the base, the basal hairs soft and somewhat 
elongated, forming a more or less pronounced postauricular patch, varying 
in prominence with the condition of the pelage in respect to season and wear. 
Total length (6 specimens, Voledn de Irazi, Costa Rica), 391 (875-420) ; 
head and body, 208 (202-217); tail vertebrae, 199 (167-215); hind foot, 
54.5 (52-85). 
Skull (6 specimens, Voledin de Irazi, Costa Rica), total length, 51.8 
_ (50.8-53); zygomatic breadth, 30.7 (29.8-32); interorbital breadth, 16.3 
(15-17); breadth of braincase, 23.7 (23-24); length of nasals, 15.5 (14.2- 
16.2); maxillary toothrow, 8.5 (8-9). 
(For measurements of additional series of hof'manni and its subspecies 
see Table III, p. 219). 
Specimens examined, 87.— Costa Rica, 9: Volcan de Irazti (alt. 6000- 
10,000 ft.), 9. 
Colombia, 67.— Western Andes (3000-8000 ft.): Rio Lima, 11 (Am. Mus. 
6, Br. Mus. 5); Rio Pescado, 2 (Am. Mus. and Br. Mus.); Rio Zapata, 2 
(Am. Mus. and Br. Mus.); Las Pavos, 3 (Am. Mus. 2, and Br. Mus. ioe 
Castilla Mts., 2 (Am. Mus. and Br. Mus.); Las Tambas, 3 (Am. Mus. 2, 
and Br. Mus. 1); San Antonio, 9 (Am. Mus.); Cerro Munchique, 8 (Am. 
Mus.); Las Lomitas, 2 (Am. Mus.); Gallera, 2 (Am. Mus.); La F lorida, 
2 (Am. Mus.).— Central Andes: Miraflores (6200 ft.), 9 (Am. Mus.); 
La Sierra (6800 ft.), 7 (Am. Mus.); El Eden (8300 ft.), 5 (Am. Mus.). 
Ecuador, 20.— Gualea, 5 (Am. Mus.); Zaruma, 4 (Am. Mus.); Pala- 
tanga, 4 (Br. Mus.); Chimbo, 2 (Br. Mus.); Batfios, 2 (Br. Mus.); Aqua- 
bamba and Intac, 1 each (Br. Mus.); “Mt. Pichincha,” 1, type of Scvurus 
séderstroémt Stone (Mus. Phila. Acad. Sci.); Santa Rosa, 3, Loja, 2 (Am. 
Mus.). : 
Remarks — 1 ypical examples of hoffmanni present a wide range of 
individual variation in not only coloration and measurements but in cranial 
characters, especially in the form of the nasals, as shown by large series 
