Abstract: With Cartesian (three dimensional) co-ordinates of cranial landmarks, the study was undertaken as a preliminary attempt at a factor analysis of three dimensional cranial data.Results showed that independent variation related well to skull growth mnainly found on anter-ior and posterior segments. It is presumably that positive allometry should exist in these seg-ments during the maturity. However, some different variation, deliberately cranial differences,also could be defined in these two leaf monkeys. That is,craniofaceis more protrusive in phayre's leaf ronkey, but occipital region and foremen magnum infrancois' leaf monkey aremore posterior in position. More wider and higher skull, be related to eating more hard foods,were defined in francois' leaf monkey.

Key words: Francois' leaf monkey (Presbytis francoisi); Phayre's leaf monkey ( P. phayrei); Factor analysis; Cranial variation