Vol. 39 No.4, October1998

Chalmeau, Raphaël; Peignot, Patricia: Exchange of Objects Between Humans and Captive Western Lowland Gorillas..........389 Key Words: Exchange; Intentional giving; Sharing; Gorillas.

Torii, Ryuzo; Nigi, Hedio: Successful Artificial Insemination for Indoor Breeding in the Japanese Monkey (Macaca fuscata) and the Cynomolgus Monkey (Macaca fascicularis)..........399 Key Words: Artificial insemination; Pregnancy; Progesterone; Estradiol-17B ; Japanese monkey; Cynomolgus monkey.

Torii, Ryuzo; Moro, Makoto; Abbott, David H.; Nigi, Hideo: Urine Collection in the Common Marmoset (Callithrix jacchus) and Its Applicability to Endocrinological Studies..........407 Key Words: Urine collection; Prolactin; LH/CG; Common marmoset.

Mayeaux, D. J.; Mason, William A.: Development of Responsiveness to Novel Objects in the Titi Monkey, Callicebus moloch..........419 Key Words: Curiosity; Development; Titi monkeys; Novelty; Responsiveness; Age-changes; Exploration.

Clarke, A. S.; Snipes, M.: Early Behavioral Development and Temperamental Traits in Mother- vs Peer-reared Rhesus Monkeys..........433 Key Words: Temperament; Early experience; Peer-rearing; Infant development; Sex differences.

Youlatos, Dionisios: Seasonal Variation in the Positional Behavior of Red Howling Monkeys (Alouatta seniculus)..........449 Key Words: Alouatta seniculus ; Red howling monkey; Locomation; Postures; Variation; French Guinia.

Dagosto, Marian; Yamashita, Nayuta: Effect of Habitat Structure on Positional Behavior and Support Use in Three Species of Lemur..........459 Key Words: Positional behavior; Habitat structure; Madagascar; Eulemur ; Propithecus.

Gil-Burmann, Carlos; Peláez, Fernando; Sánchez, Susana: Variations in Competitive Mechanisms of Captive Male Hamadryas-like Baboons in Two Feeding Situations..........473 Key Words: Papio hamadryas ; Baboons; One-male units; Males; Food distribution; Compatitive mechanisms.

Russon, Anne E.: The Nature and Evolution of Intelligence in Orangutans (Pongo pygmaeus)..........485 Key Words: Orangutans; Great ape intelligence; Hierarchical intelligence; Great ape evolution; Evolution of intelligence.

Arcadi, Adam Clark; Robert, Daniel; Boesch, Christophe: Buttress Drumming by Wild Chimpanzees: Temporal Patterning, Phrase Integration into Loud Calls, and Preliminary Evidence for Individual Distinctiveness..........505 Key Words: Chimpanzee; Drumming; Individual distinctiveness; Signatures; Dialects.

Pan, Ruliang; Jablonski, N. G.; Oxnard, C.; Freedman, L.: Morphometric Analysis of Macaca arctoides and M. thibetana in Relation to Other Macaque Species..........519 Key Words: Macaca ; Stump-tailed macaques; Morphometric analysis; Classification; Phylogeny.

Short Communications

Goin, Deborah L.; Gust, Deborah A.: Peer-rearing Influences Subsequent Maternal Behavior and Infant Survival in a Newly Formed Herpes B-virus Negative Rhesus Macaque Group..........539 Key Words: Peer-reared; Primiparous; Maternal behavior; Herpes B-virus screen; Rhesus macaques.

Richard-Hansen, Cécile; Bello, Natalia; Vié, J.-Christophe: Tool Use by a Red Howler Monkey (Alouatta seniculus) Towards a Two-toed Sloth (Choloepus didactylus)..........545 Key Words: Alouatta seniculus ;Red howler monkey; Tool use; Interspecific interaction; Two-toed sloth; Choloepus didactylus.

Michels, Anne M.: Sex Differences in Food Acquisition and Aggression in Captive Common Marmosets (Callithrix jacchus)..........549 Key Words: Aggression; Sex; Food; Foraging; Callithrix jacchus.

Note..........557

Cumulative Contents, Author Index, Scientific Name Index, and Subject Index for Volume 39 (1998)..........559