18 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 125 
involve research into many diverse fields of primate biology such as 
anatomy, paleontology, behavior, serology, and genetics. Thus, the 
systematics program undoubtedly will provide a considerable mass of 
fall-out information in these special fields of study in addition to 
providing taxonomic revisions of the genera. 
Priority from the point of view of early revision will be given to 
those genera most commonly used in scientific research. The mar- 
mosets are undergoing revision at present (Hershkovitz, 1966, and 
in litt.) as are some of the macaque species (Fooden, 1964, 1967). 
Papio recently has been restudied, principally from the viewpoint of 
osteology and paleontology (Jolly, 1965). 
The genus Cercopithecus, on the other hand, has not been fully 
revised since Schwarz’ (1928) study, although Hill (1964, 1966a, 
1966b) has contributed much toward our knowledge of the taxonomy 
of these animals, particularly from the point of view of gross anatomy. 
Certain species and species-groups such as the Mona monkeys have 
been reviewed recently by Booth (1955); and the aethiops group, by 
Dandelot (1959). Verheyen (1962) has studied the skull osteometri- 
cally and osteologically; Chiarelli (1966) has supplied a great deal of 
information on chromosome numbers. Jacob and Tappen (1957, 
1958) have studied haemoglobins. Booth (1956, etc.) has studied the 
ecology of certain West African representatives, and Haddow (1952) 
has supplied detailed information for a single subspecies, the redtail 
(C. ascanius schmidti). Few behavior studies have been published; 
Hall and Gartlan (1965) have observed the social behavior of C. 
aethiops on Lolui Island, Lake Victoria, and Cynthia Booth (1962) 
and Brain (1965) have studied the behavior of certain species of 
Cercopithecus in captivity. These studies must be extended to include 
all twenty-one species and sixty-seven subspecies now recognized. It 
must also be extended to the closely related forms Miopithecus (the 
talapoin, a species potentially of great value to research on account 
of its small size), Allenopithecus (the swamp monkey), and Erythro- 
cebus (the patas monkey) with a view to determining whether these 
forms are congeneric with Cercopithecus. The aethiops species-group of 
Cercopithecus are another potentially important source of laboratory 
primates. The aspects of the biology of this group needing particular 
study are serology, ecology, and behavior. Evolutionary studies, which 
should provide the basis of any classification, are also most important 
(see Jolly, 1966) ; fortunately, the fossil material of the Cercopithecidae 
is moderately common, particularly in the Pleistocene (Jolly, 1965). 
A zoogeographical study of the group after the manner of Hershkovitz 
on Callicebus (1963) is also imperative for the full understanding of 
their origin and dispersal (see also Tappen, 1960). It is proposed, 
therefore, to initiate a revision of the genus Cercopithecus. Other 
