Vol. 37, No. 1 January 1996

Zuberbühler, Klaus; Gygax, Lorenz; Harley, Nerida; Kummer, Hans: Stimulus Enhancement and Spread of a Spontaneous Tool Use in a Colony of Longtailed Macaques..........1 Key Words: Non-human primates, Long-tailed macaque, Social learning, Stimulus enhancement, Tool use.

Ramsay, Neil F.; Giller, Paul S.: Scent-marking in in Ring-tailed Lemurs: Responses to the Introduction of "Foreign" Scent in the Home Range..........13 Key Words: Ring-tailed lemur, Scent-marking.

Kanazawa, So: Recognition of Facial Expressions in a Japanese Monkey (Macaca fuscata ) and Humans (Homo sapience )..........25 Key Words: Facial expression, Recognition, Multi-dimensional scaling, Japanese macaque, Comparative study.

Chalmeau, Raphaël; Gallo, Alain: What Chimpanzees (Pan troglodytes ) Learn in a Cooperative Task..........39 Key Words: Cooperation, Instrumental learning, Glancing, Chimpanzee.

Torii, Ryuzo; Abbott, David H.; Nigi, Hideo: Morphological Changes of the Common Marmoset (Callithrix jacchus )..........49 Key Words: Common marmoset, Estradiol-17ß, Laparoscopy, Ovulation, Progesterone.

Samilchuk, Elena: Genetic Polymorphism of Alpha-1-antitrypsin Correlates with a Classification of African Green Monkeys..........57 Key Words: Alpha-1-antitrypsin, African green monkey, Vervets, Grivets.

Sampaio, Iracilda; Schneider, Maria Paula Cruz; Schneider, Horacio: Taxonomy of the Alouatta seniculus Group: Biochemical and Chromosome Data..........65 Key Words: Howler monkey, Platyrrhini, Taxonomy, Genetic distance.

Short Communications

Gorzitze, Andrea B.: Birth-related Behaviors in Wild Proboscis Monkeys (Nasalis larvatus )..........75 Key Words: Proboscis monkey ,Birth, Placenta consumption, Infant transfer, Postconception estrus.

Koyama, N. F.; Dunbar, R. I. M.: Anticipation of Conflict by Chimpanzees..........79 Key Words: Anticipation of conflict, Grooming, Chimpanzee, Tolerated theft.

Oliveira-Filho, Ary T.; Galetti, Mauro: Seed Predation of Cariniana estrellensis (Lecythidaceae) by Black Hoeler Monkeys, Alouatta caraya ..........87 Key Words: Atlantic forest, Black howler monkey, Lecythidaceae, Seed predation, Semi-deciduous forest.

Laska, Matthias: Taste Preference Thresholds for Food-associated Sugars in the Squirrel Monkeys (Saimiri sciureus )..........91 Key Words: Common squirrel monkey, Taste, Preference thresholds, Sugars.

Anderson, J. R.; Degiorgio, C.; Lamarque, C.; Fagot, J.: A Multi-task Assessment of Hand Lateralization in Capuchin Monkeys (Cebus apella )..........97 Key Words: Tufted capuchin, Laterality, Cerebral dominance, Handedness, Tool use.

Messner, Ellen J.; Wrangham, Richard W.: In vitro Testing of the Biological Activity of Rubia cordifolia Leaves on Primate Strongyloides Spicies..........105 Key Words: Zoopharmacognosy, Chimpanzee, Self-medication, Rubia cordifolia, Medicinal plants, Nematodes.

Review

Jurke, Mike H.: Behavioral and Hormonal Aspects of Reproduction on Captive Goeldi's Monkeys (Callimico goeldii ) in a Comparative and Evolutionary Context..........109 Key Words: Reproductive behavior, Sexual hormones, Evolution, Clawed New World monkeys, Goeldi's marmoset.