Vol. 43 No. 2, April 2002

Urbani, Bernardo: A Field Observation on Color Selection by New World Sympatric Primates, Pithecia pithecia and Alouatta seniculus ..........95 Key Words: Talisia retusa; Fruit choice; Seed predator/seed disperser; Lago Guri; Venezuela.

Matsumoto-Oda, Akiko: Behavioral Seasonality in Mahale Chimpanzees ..........103 Key Words: Behavioral flexibility; Party size; Activity budget; Chimpanzees.

Okamoto, Kyoko; Matsumura, Shuichi: Intergroup Encounters in Wild Moor Macaques (Macaca maurus) ..........119 Key Words: Intergroup encounter; Between-group competition; Moor macaques; Macaca maurus.

Gerald, Melissa S.: The Finding of an Inverse Relationship between Social Dominance and Feeding Priority among Pairs of Unfamiliar Adult Male Vervet Monkeys (Cercopithecus aethiops sabaeus) ..........127 Key Words: Social dominance; Feeding priority; Scrotal colour; Vervet monkeys.

Takahashi, Hiroyuki: Changes of Dominance Rank, Age, and Tenure of Wild Japanese Macaque Males in the Kinkazan A Troop during Seven Years ..........133 Key Words: Age; Macaca fuscata fuscata; Rank; Troop male; Troop tenure.

Short Communications

Peignot, P.; Fontaine, B.; Wickings, E. J.: A Preliminary Study on the Social Relationships in a Semi-free Ranging Colony of Sun-tailed Monkeys (Cercopithecus solatus), a Species Recently Discovered in Gabon ..........139 Key Words: Cercopithecinae; C. solatus; Sun-tailed monkey; Social relationships; One-male group; Semi-free ranging colony.

Lawler, Richard R.; Stamps, Casey: The Relationship Between Tail Use and Positional Behavior in Alouatta palliata ..........147 Key Words: Alouatta palliata; Howling monkeys; Tail prehension; Positional behavior.

Book Review ..........153