关键词: 菲氏叶猴, 黑叶猴, 面颅形态

Abstract: Sixteen adult skulls of phayre's leaf monkey， including Presbytis P．p.shanicusand eight of francois 'leaf monkey，including P.f,leucocephalus were dealt in this paper．Using statistics and computer， we found that within the two species there are twenty one significant differences of cephalometric variables and indices coming from fourty five of them .Some results are summarized as follows：
1．The sequence of significant difference of the cephalometric variables is that height of the mandibular ramus>skull height>the posterior orbital width>maximum cranial width> width of the mandibular ramus> maxillaveolar width> cranial leagth>width bet-
ween the orbitae> the distance from the anterior point of the occipital condyle to the nasion> the maximum length of the skull> palatal length> foramen magnum length> maximum cranial length> the lateral breadth between both of the orbitae> mandibular len gth>the distance from the basion to the tip of external occipital protuberance．
The sequence of indices being significant difference is：mandibular ramus indices>palatal／the distance from the prosthion to the medial point of margin of the foramen magnum>cranial hei- ght／ cranial Iength>upper facial height／ breadth between zygom as>palatal indices> prosthion indices> the balance indices of the head> breadth betweenthe orbitae／maximum breadth of the orbitae> upper facial height／breadth between the orbitae．
2． Because of the significant difference between cranial length indices, the shape of the skulls in the phayre's leaf monkeys belong to the chamaecrany， but that in the francois'leaf monkey to orthocrany．
3．Phayre's leaf monkey is more protrusion than that of the francois'leaf monkey for the facial morphology．
4．The position of the foramen magnum in the phayre's leaf monkey is more orally compared with that of francois'leafmonkey．
5．In the francois'leaf monkey，optic ability was more developed than that in thephayre's leaf monkey．
6．Allometric formulas between canine and cranial length in two species were produced．The correlation coefficients show that in francois'leaf monkey the cranial length is more correlated with the canine when they are growing compared with that of phayre's leaf monkey．

Key words: Presbytis Phayrei Phayre’s leaf monkey, Francois’leaf monkey P．francoisi, Craniofacial morphology.