234 ALLEN’S NATURALIST’S LIBRARY. 
marest from the same specimen in Paris, which Kuhl described 
under the name of A. geoffroyt. Every gradation is to be met 
with between this and the form described by Dr. Gray as A. 
ornatus, in which the face is entirely black, the whiskers pale 
reddish-yellow, the patch of erect black hair on the forehead 
yellowish at its base; the top of the head, sides, lower back, 
rump, upper part of the arms, outer, inner and posterior por- 
tion of the thighs and legs, and under side of the base of the tail, 
brownish-red ; nape, shoulders and remainder of the tail red- 
dish-brown, washed with black ; lower part of arms, fore-arms, 
hands, feet, and anterior aspect of thighs and legs, black. 
In some specimens the grey, or reddish-black colour, merges 
on the under surface, into yellowish-cream, or rufous, and the 
black wash is more or less distributed. 
Mr. Alston, in speaking of this species, remarks that the 
best character by which the darker (4. ovmazus) forms may be 
distinguished from our next species (4. rufiventris) is the want 
of a distinct line of demarcation between the colours of the 
upper and lower parts, the tint of the flanks, whatever it may . 
be, passing almost insensibly into that of the breast and belly 
in all the varieties. 
Distribution—The variation in colour described above is not 
due to local causes, every variety occurring between the lightest 
and darkest, in all the regions which this species is known to 
inhabit. The localities from which it has been recorded are 
on both the Atlantic and Pacific coasts of Nicaragua ; Costa 
Rica, where it occurs in large numbers from the coast forests 
up to nearly 7,000 feet on the mountains ; Panama, and the 
U.S. of Colombia. 
Habits.—Geoffroy’s Spider-Monkey is gregarious and arboreal, 
