THE MARMOSETS AND TAMARINS. 129 
4 
and one of the Night-Apes (VWyctipithecus voctferans)—extends 
‘beyond Colombia, in South America.” 
“None of the South American Monkeys appear to pass west 
of the Andean chain of mountains south of Ecuador, and even 
north of the Peruvian boundary the number of such transgres- 
sional forms is very limited. Indeed, even among the wooded 
slopes, a habitation along the basal line of the mountain axis 
seems to be much preferred. The greatest altitude at which 
Monkeys were observed by Tschudi in Peru was 3,000 feet 
(Lagothrix humboldti); Ateles ater and Cebus robustus were 
found at 2,500 feet. On the other hand, Salvin and Godman 
state that in the district of Vera Paz, in Guatemala, the ‘Mono’ 
or Howler is most abundant at an elevation of 6,000 feet ; and 
on the Volcano of Atitlan, in the same country, Mr. Salvin 
found troops of the Mexican Spider-Monkey (AZzeles vellerosus) 
in the forest region of 7,000 feet elevation. 
“The range of the Marmosets and Oustitis (Hapalde) is 
nearly co-extensive with that of the Monkeys proper.” (/7e7/- 
érin.) ‘The Pigmy and the Silky Marmoset range as far north 
as Mexico. ) By 
| ; 
. tL 
THE MARMOSETS AND TAMARINS. FAMILY 
HAPALIDA, 
Of the New World, or Platyrrhine, Apes, the Marmosets come 
to be described first, as they have many characters which mark 
them out as the lowest of the Azthropoidea, and rank them 
nearer to the Lemuvrotdea than any of the others. They are 
specially characterised by having only thirty-two teeth, their 
dental formula being I2, C1, P#, M3. In the actual number of 
their teeth they agree with their Eastern relations, but with this 
3-v. 1 K 
