Vol. 36, No. 1 January 1995

Kumar, Ajith: Birth Rate and Survival in Relation to Group Size in the Lion-tailed Macaque, Macaca silenus ..........1 Key Words: Birth rate, Survival, Density dependence, Demography.

Mori, Akio: Rank and Age Related Feeding Strategy Observed Through Field Experiment in the Koshima Group of Japanese Macaques..........11 Key Words: Japanese macaque, Feeding speed, Rank, Age, Food processing, Optimal feeding strategy, Reproductive success.

Perry, Susan; Manson, Joseph H.: A Comparison of the Mating Behavior of Adolescent and Adult Female Rhesus Macaques (Macaca mulatta )..........27 Key Words: Sexual behavior, Rhesus macaque, Adolescence, Cayo Santiago.

Clarke, A. S.; Czekala, N. M.; Lindburg, D. G.: Behavioral and Adrenocortical Responses of Male Cynomolgus and Lion-tailed Macaques to Social Stimulation and Group Formation..........41 Key Words: Species differences, Temperament, Agonistic behavior, Stress, Group formation, Cortisol, Lion-tailed macaque, Long-tailed macaque.

Mendoza-Granados, Domingo; Sommer, Volker: Play in Chimpanzees of the Arnhem Zoo: Self-serving Compromises..........57 Key Words: Play, Chimpanzee.

Ferguson, Walter W.: A New Species of the Genus Homo (Primates: Hominidae) from the Plio/Pleistcene of Koobi Fora, in Kenya..........69 Key Words: Homo, Cranium, Koobi Fora, Plio/Pleistocene.

Kimura, Tasuku; Hamada, Yuzuru: Reterdation of Bone Development in the Koshima Troop of Japanese Macaques..........91 Key Words: Japanese macaque, Koshima troop, Growth, Retardation, Body size, Epiphyseal union.

Kobayashi, Shuji: A Phylogenetic Study of Titi Monkeys, Genus Callicebus, Based on Cranial Measurements: I. Phyletic Groups of Callicebus..........101 Key Words: Titi monkey, Multivariate analysis, Cranial measurements, Shape factor, Phylogeny.

Terao, Keiji; Hamano, Masaaki; Koyama, Takamasa: The Repeated Procedure of Weaning and Peer Group Formation Causes Accumulation of Stress and Changes of Plasma Cortisol Level and Natural Killer Activity in Squirrel Monkeys (Saimiri sciureus )..........121 Key Words: Weaning, Peer group formation, Gang-cage-adaptation, Plasma cortisol, Natural killer cells, Psychological stress, Common squirrel monkey.

Schneider, Maria P. C.; Schneider, Horacio; Sampaio, Maria I. C.; Carvalho-Filho, Nelson M.; Encarnación, Filomeno; Montoya, Enrique; Salzano, Francisco M.: Biochemical Diversity and Genetic Distances in the Pitheciinae Subfamily (Primates, Platyrrhini)..........129 Key Words: Genetic distances, Amazon region, Uakari, Bearded saki, Saki.

Short Communications

Ren, Renmei; Yan, Kanghui; Su, Yanjie; Qi, Hanjun; Liang, Bing; Bao, Wenyong; de Waal, Frans B. M.: The Reproductive Behavior of Golden Monkeys in Captivity (Rhinopithecus roxellanae roxellanae )..........135 Key Words: Golden monkey, Reproductive behavior, Sexual solicitation, Prostration, Individual differences.

Walraven, Vera; van Elsacker, Linda; Verheyen, Rudolf: Relations of a Group of Pygmy Chimpanzees (Pan paniscus ) to Their Mirror-images: Evidence of Self-recognition..........145 Key Words: Self-recognition, Pygmy chimpanzee, Mirror.