198 Systematic Arrangement of the Marmosets. 
even split the normal-sized species of Hapale into two groups, 
largely on account of the two sharply differentiated forms of 
coloration found in it, and would also distinguish the Pygmy 
Marmoset as a special genus. 
Thus, apart from Callimico, the whole may bo classified as 
follows :— 
A. Lower teeth normal, the canines much longer than 
the incisors. 
u, Fingers elongated. Tail (at least its upper side) 
and forearms golden yellow. Skull dolicho- 
cophalic.» Reeth Manse ome ci. cute ome ch sla 1. Leontocebus. 
Species: chrysomelas (type), leoninus, rosalia. 
b. Fingers normal, Skull more brachycephalic. 
‘Teeth smaller. 
a. Tail and forearms uniformly black*. Face 
Hey As Usual eer elect la ae leh ie scans .. 2. Mystaz. 
Species: mystax (type), aprculatus, bluntschlii, chrysopygus, 
devillei, flavifrons, fuscicollis, graellst, griseoventris, ilhgert, 
imperator, labiatus, lagonotus, leucogenys, melanoleucus, mi- 
das, nigricollis, nigrifrons, pileatus, rufimanus, rufiventer, 
rufonger, thomast, tripartitus, ursulus, weddelli. 
)°, Forearms and hands white or yellowish. Face, 
or at least its sides, short-haired or naked. 
a, Ears of normal length. ‘Tail dark proxi- 
mally, at least above, lighter terminally.. 3. Sentocebus. 
Species: bicolor (type), leucopus, martinsi, meticulosus. 
b°, Ears short. Tail red proximally, black ter- 
WAIN GVeateeietanies giats Obeiic eae eeeeee 4, Gdipomidas. 
Species: wdipus (type), geoffroyz, salaquiensis, ~ 
I}. Lower teeth modified, the canines little longer 
than the incisors. 
ec, Size about asin other marmosets. Mandible high 
in proportion to its length, the condylar process 
upright. P' with an internal lobe. 
e?, Kars untufted. Tail wholly black.......... 5. Mico. 
Species: argentatus (type), emilie, leucippe, melanurus. 
d?, Kars with long tufts on or round them. Tail 
ringed with white or yellowish............ 6. Hapale. 
Species: jacchus (type), albicollis, aurita, chrysoleuca, flaviceps, 
humeralifer, jordant, leucocephala, penicillata, santaremensis. 
d. Size much smaller. Mandible lower in propor- 
tion to length ; condylar process slanted back- 
wards. P' without internal lobe............ 7. Cebuella. 
Species: pygmea (type). 
Three white species, however, whose original derivation 
may or may not have been due to albinism, will not fall 
* Hands sometimes yellow, generally black. 
