459-468
Decisions on time allocation to different food patches by Japanese monkeys (Macaca fuscata)
Naofumi Nakagawa
469-480
Social play and sexual behavior of the bonobo (Pan paniscus) with special reference to flexibility
Tomoo Enomoto
481-494
Group harmony in gibbons: Comparison between white-handed gibbon (Hylobates lar) and siamang (H. syndactylus)
Jan O. Fischer and Thomas Geissmann
495-508
The distribution of baboon species and a new population of gelada baboons along the Wabi-Shebeli river, Ethiopia
Akio Mori and Gurja Belay
509-521
Playmate relationships of immature free-ranging Japanese monkeys at Katsuyama
Shinji Imakawa
523-535
Parturition and perinatal behaviour in captive cotton-top tamarins (Saguinus oedipus)
Eluned C. Price
537-544
Object concept and mental representation inCebus apella andMacaca fascicularis
Gabriele Schino, Giovanna Spinozzi and Luisa Berlinguer
545-553
Multidimensional auditory stimulus control in a chimpanzee (Pan troglodytes)
Masaki Tomonaga
555-562
Numerical analysis of the taxonomical status ofCallithrix kuhli based on measurements of the postcanine dentition
Masahito Natori
563-570
Paternity discrimination in a Japanese macaque group by DNA fingerprinting
Miho Inoue, Akiko Takenaka, Shoji Tanaka, Ryo Kominami and Osamu Takenaka
571-577
A cytogenetic study on congenital limb malformations in the Japanese monkey (Macaca fuscata)
Mitsuru Minezawa, Ken Nozawa, Shunji Gotoh, Shinichi Yoshihiro and Yuzuru Hamada, et al.
579-588
Problems associated with long-term feeding of purified diets in rhesus monkeys
Mari S. Golub, M. Eric Gershwin, Bo Lonnerdal, Carl L. Keen and Lucille S. Hurley, et al.
589-596
Short Communication
Inter-population differences in the time budgets of bonnet monkeys (Macaca radiata)
Mewa Singh and S. Vinathe
597-600
Short Communication
Do rhesus mothers suggest friends to their offspring?
Frans B. M. de Waal
601-606
Short Communication
Vocal communication in captive golden monkeys (Rhinopithecus roxellanae)
A. S. Clarke
607-609
Short Communication
Avian nest predation by a semi-captive collared lemur (Lemur fulvus collaris)
Douglas H. Shedd
611-615
Short Communication
Operant conditioning of scratching in lemurs
James R. Anderson, Catherine Fritsch and Bernadette Favre
617-620
Short Communication
Sex identification of the phayre's leaf monkey (Presbytis phayreiBlyth
, 1847) with the help of facial marks
T. Bhattacharya and D. Chakraborty
621-624
Research Report
Digging and eating of underground plant-parts by wild Japanese monkeys (Macaca fuscata)
Motoi Iguchi and Kosei Izawa
625-634
Research Report
A note on the present situation of the primate fauna found from south-eastern Cameroon to northern Congo
Masazumi Mitani
635-641
Research Report
Case report on the death of a wild chimpanzee (Pan troglodytes verus)
Tetsuro Matsuzawa, Osamu Sakura, Tasuku Kimura, Yuzuru Hamada and Yukimaru Sugiyama
642
Information
Books received