238 Bulletin American Museum of Natural History. [Vol. XXXIV, 
basal portion) black, forming a broad median band, not sharply defined 
laterally from the sides of the body; sides of head, neck, shoulders, flanks, 
and thighs red, deepest on the shoulders and there often nearly meeting at 
the mid-dorsal line; underparts deep, dark red, varying in different speci- 
mens to deep orange, with or without (usually without) irregular small 
spots or streaks of clear white; outside and inside of limbs like the adjoin- 
ing parts; tail above black at the base for the proximal two or three inches, 
the rest deep red, usually including the tip, but the terminal hairs are 
usually black basally, the black portion often visible through the surface 
wash of red, and sometimes the extreme tip is distinctly black; under sur- 
face of tail grizzled ochraceous and black for the basal two thirds, followed 
by a zone of black extending apically for two to three inches or more (in 
different specimens), or the median area may be almost wholly black as far 
as the apical third or fourth of the tail, the rest red; the hairs individually 
at the base are narrowly banded with ochraceous and black, giving a griz- 
zled effect to the median area, followed by a broad zone of black, which is 
very broad proximally and narrows toward the tip of the tail, where the 
black is often wholly concealed by the long red tips of the hairs. 
The above may be taken as a description of the average condition in 
typical gerrardz, but it is hard to find two specimens that wholly agree in 
coloration, even in a series from the same locality, while specimens from 
remote localities can be found that are so nearly alike as to be almost in- 
distinguishable. The black of the median dorsal area is apt to be more 
or less finely punctated with red, and the thighs are usually paler than the 
shoulders, the hair tips being ochraceous or ochraceous red instead of deep 
red (or even brilliant red) as on the shoulders. The type of gerrardi is paler 
red, with the hair tips on the flanks, thighs, and sides of the lower back 
more ochraceous than is indicated in the above description, but, with the 
exception of the wholly white belly, the type is like many of the specimens 
I have examined from the coast region of western Colombia. Occasional 
specimens are more or less spotted with white on the ventral surface (never 
two in the same manner), and one (No. 32701, San Jorge) has the belly 
white washed lightly with red in places, where the tips of the hairs are red 
and the base white. 
Total length, average 450 mm.; head and body, 225; tail vertebree, 225; 
hind foot, 57. 
Skull (No. 34130, Bagado), total length, 57; zygomatic breadth, 35; 
interorbital breadth, 18.5; breadth of braincase, 25; length of nasals, 19; 
maxillary toothrow, 9.6. 
Unfortunately there is no series of specimens from the type region of 
gerrardi with trustworthy field measurements, nor is a series of measurable 
skulls available at this writing. 
