440 NOTE PXn~ATES, 21(3): 440--442, July 1980 XXIV Annual Meeting of the Japanese Society for Primate Research The 24th Annual Meeting of the Japanese Society for Primate Research was held at the Visitor Centre of the Japan Monkey Centre on March 24 and 25, 1980. About 160 investiga- tors attended the meeting, and 47 papers covering various fields were presented. The titles of the papers read were as follows: 1. Physical development of Japanese monkeys during the first year of age. --Yuztmu HAMADA, Kyoto University. 2. Hematological changes in the Japanese monkey (Macaca fuscata) from birth to one year of age. --AKIKO TAKENAKA and OSAMU TAKENAKA, Kyoto University. 3. Behavioral analysis of the development of visual perception in Japanese monkeys during the first year of age. --TETsURO MATSUZAWA, Kyoto University. 4. Behavioral studies on two mother-infant pairs in the Japanese monkey--Social development of the infants. --KIYOMI KONDO and KOlCHI NEGAYAMA, Osaka University; TETSUHIRO MINAMI, Tokyo Women's College. 5. Play behavior of young Japanese monkeys. 1. Behavioral analysis, wTAKAMASAKOYAMA and SACHIKO KOYAMA, Osaka University. 6. Play behavior of young Japanese monkeys. 2. Comparison of the Katsuyama and Awajishima free-ranging groups. --MAsAYUKI NAKAMICHI, TAKAMASAKOYAMA, and SACHIKO KOYAMA, Osaka University. 7. Development of social relations among juvenile Japanese monkeys at Koshima. --HITOSHIGE HAYAKI, Kyoto University. 8. Sexual behavior of Japanese monkeys in the Katsuyama free-ranging group. 1. Analysis of indi- vidual relationships. --NAoSUKE ITOIGAWA, AKIHITO ANDO, KOICHI NEGAYAMA, and SHOJI MACHIDA, Osaka University. 9. Sexual behavior in Japanese monkeys of the Katsuyama free-ranging group. 2. Analysis of copu- latory behavior. --HISANORI FUJII, YOSHIO WATANABE,TAKAMASA KOYAMA,and iNIOBUKO HAT- TORI, Osaka University. 10. Male aggression and sexual behavior in Japanese monkeys. --ToMOO ENOMOTO, Tokai University School of Medicine. 11. Learning-set formation in slow lorises. --HIROHIKO OHTA, Osaka University. 12. Early acquisition of visual language in chimpanzees (Pan troglodytes). --KIYOKO MUROFUSHI, TOSHIOASANO, TETSUROMATSUZAWA, TETSUYAKOJIMA, KAZUO FUJITA, SATORUODA, KISOO KUBOTA,and SHIN NAGAO, Kyoto University; AKIOKAMIO, Shizuoka University. 13. Innate and acquired aspects of chimpanzee instrumental behavior. --KoJi NORIKOSHI and TAKA- SHI KITAHARA, Sophia University. 14. Triadic or polyadic encounters among non-troop males of the Japanese monkeys (Macaca fus- cata) at Koshima. --KAzuYOSHI SUGAWARA, Kyoto University. 15. Social relationships of peripheral males in the Katsuyama free-ranging groups of Japanese mon- keys. --TETsU NISHIZAWA, Kyoto University. 16. Distribution of individuals in travelling troops of Japanese monkeys--The case of the Minoo A troop. --TAKEHIKO MINAMI, Osaka University of Education. 17. Ecological study on troop fission in the Japanese monkeys (Macacafuscata yakui) on Yakushima Island, Japan--Population and home range. --TAMAKI MARUHASHI, Kyoto University. 18. Long-term changes in the winter homerange of Japanese monkeys in the Shiga Heights. --KAzuo WHOA, Kyoto University. 19. Inter-troop relationships in Japanese monkeys living in the Shiga Heights. --SHINICHI Yosnmmo, Kyoto University.