Abstract: 13 Francoi's leaf monkeys (5 males and 8 females) and 7 Phayre's leaf monkeys (2 malesand 5 females) were used to observe the dermatoglyphics on the hands and feet, The patter nsexamined include digital end I-IV, interdigital area, thenear and hypothenar, the triradius andflexure lines on the plams and soles. The results are as follows:
1) All of the patterns on thedigital end are sinus primarius. There exist four kinds ofpatterns in the seven areas of the plams, that is L(looped form), o (opened field form). W(whorled form) and Z (composite form). However, most of them are the L forms. On the so-les, six kinds of them, L. 0. W., A (arches), A and U (unknown form) appear. Like onthe palm, most of them are the L pattern.
2) Number of the triradius is different on the palms. 5-- -7 on the palm which constantlyexist tl and t7 for the P. francoisi, tl, t3 and t7 for the P. phayrei; 4--6 on the soles whichconstantly represent t2, t9, and tl3 for the P. francoisi, t9 and tl3 for P. phayrei 1.
3) Flexure lines form joint lines of the skin on the palms and soles. There exist 1 to 2lines on the distal digits, 2 to 3 in interdigits. Flexure lines on the digital proximal form acontinuous common line which is attached by some lines with different shapes or by bran-ched one. There exist two flexure lines on the palms and soles. Two flexure lines on the wri-st, which sometimes is branched away, usually. are recorded. The longitudinal flexurelines ofthe radialis and tibialis sides are the constant on the plams and soles.
4) Multivariate analysis (R cluster analysis) demonstrates the relationship between thepatterns for these two leaf monkeys.

Key words: Dermatoglyphics; Francois' leaf monkey (Presbytis francoisi); Phayre's leaf monkey (P. phayrei)