We report here a karyotypic study of 6 individuals of Hylobates concolor leucogenys, 2 H. concolor siki, 3 H. concolor gabriellae, 1 hybrid H. concolor leucogenys Χ H. concolor siki, 3 hybrid H. concolor gabriellae Χ H. concolor siki and 2 hybrid H. concolor hainanus Χ H. concolor leucogenys. Difficulties raised by the mophological identification of subspecies are discussed, and a new morphological characteristic for recognising female H. concolor gabriellae is described. Each of the 4 subspecies appears to be distinguishable on the basis of its karyotype: H. concolor leucogenys differs from H. concolor siki by a reciprocal translocation, from H. concolor hainanus by a pericentric inversion and from H. concolor gabriellae by the presence of both of these two rearrangements. However, these data do not allow us to identify a phylogenetic relationship between the subspecies because, with respect to the karyotypes, none occupies an ancestral position in comparison with the others.

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