Banding patterns of the chromosomes of Presbytis cristatus pyrrhus and P. obscurus.

The G- and Q-bands and the location of the nucleolar organizer regions (NOR) in the chromosomes of Presbytis obscurus and the Q- and C-bands of P. cristatus pyrrhus are described. Their chromosomes are compared to those of Macaca mulatta and to other Cercopithecidae and Hylobatidae. The origin of the two different banding patterns of pair no. 1 in our specimen of P. cristatus pyrrhus is discussed.