Vol. 37, No. 2 April 1996

Mahaney, William C.; Hancock, R. G. V.; Aufreiter, Susan; Huffman, Michael A.: Geochemistry and Clay Mineralogy of Termite Mound Soil and the Role of Geophagy in Chimpanzees of the Mahale Mountains, Tanzania..........121
Key Words: Geophagy, Chimpanzee, Self-medication, Metahalloysite, Kaopectate(TM).

Zhao, Qi-Kun: Male-infant-male Interactions in Tibetan Macaques..........135
Key Words: Agonistic buffering, Ecological adaptation, Tibetan macaque, Male-infant caretaking, Male-infant-male interaction.

Manson, Joseph H.: Rhesus Macaque Copulation Calls: Re-evaluating the "Honest Signal" Hypothesis..........145
Key Words: Rhesus macaque, Copulatory vocalizations, Mate choice, Handicap principle, Cayo Santiago.

Nakamichi, Masayuki; Minami, Tetsuhiro; Cho, Fumiaki: Comparison Between Wild-born Mother-female Infant Interactions and Laboratory-born Mother-female Infant Interactions During the First 14 Weeks After Birth in Individually Caged Cynomolgus Macaques..........155
Key Words: Mother-infant interactions, Long-tailed macaque, Wild-born mother, Laboratory-born mother, Parity.

Vochteloo, Johan D.; Timmermans, Paul J. A.; Duijghuisen, John A. H.; Vossen, Jo M. H.: The Development of Range of Action in Infant Cynomolgus Monkeys (Macaca fascicularis ) Reared by Restrained Mothers..........167
Key Words: Infant's range of action, Restrained mothers, Long-tailed macaque.

Ximenes, M. F. F. M.; Sousa, M. B. C.: Family Composition and the Characteristics of Parental Care During the Nursing Phase of Captive Common Marmosets (Callithrix jacchus )..........175
Key Words: Common marmoset, Alloparental care, Helpers, Older siblings, Nursing phase.

Kawanaka, Kenji: Observation Time and Sampling Intervals for Measuring Behavior and Interactions of Chimpanzees in the Wild..........185
Key Words: Chimpanzee, Behavior measurement, Observation time, Instantaneous sampling, Sampling interval, Mahale Mountains.

Hopkins, William D.; Washburn, David A.; Hyatt, Charles W.: Video-task Acquisition in Rhesus Monkeys (Macaca mulatta ) and Chimpanzees (Pan troglodytes ): A Comparative Analysis..........197
Key Words: Chimpanzee, Rhesus monkey, Joystick, Video, Learning.

Myowa, Masako: Imitation of Facial Gestures by an Infant Chimpanzee..........207
Key Words: Infant chimpanzee, Imitation, Facial gestures, Developmental change.

Rabarivola, C.; Meier, B.; Langer, C.; Scheffrahn, W.; Rumpler, Y.: Population Genetics of Eulemur macaco macaco (Primates: Lemuridae) on the Islands of Nosy-Be and Nosy-Komba and the Peninsula of Ambato (Madagascar)..........215
Key Words: Black lemur, Island populations, Protein markers, Founder effect, Genetic variation, Genetic drift.

Short Communication

Leonard, Suzi; Bennett, Cynthia: Associative Behavior of Cacajao calvus ucayalii with Other Primate Species in Amazonia Peru..........227
Key Words: Bald uakari, Humboldt's woolly monkey, Associative behavior.

Book Reviews..........231