中村 浩二

インドネシア西ジャワ州ボゴール植物園におけるアリ類の種多様性，およびムカシアリ属2 新種の記載

Ant fauna was investigated in the Bogor Botanic Garden (Kebun Raya Bogor), West Java, Indonesia, by the following sampling methods: (1) collection of ants on tree trunks, (2) collection of litter ants using a handy sifter, (3) pitfall traps, (4) sugar baits, (5) collection of ants on bamboo shoots, (6) searching for colonies, (7) collection of foraging workers. In all, 216 species representing all the subfamilies known from the Oriental region were collected in 1985 and between 1990 and 1998. After intensive collections in 1995 and 1997, the cumulative number of ant species was still increasing slowly in 1998. The ant fauna was compared with the results from other sites in Southeast Asia, and those of preliminary surveys made by us in four national parks in West Java, i.e., Ujung Kulon and Pangandaran (lowland forests), and Gunung Halimun and Gunung Gede (mountain forests). Species composition in the Bogor Botanic Garden was similar to that of lowland rainforests in West Java, but remarkably different from mountain forests.

非害虫の食植性テントウムシ， Epilachna pytho (甲虫目，テントウムシ科)の生存ー繁殖スケジュール

A non-pest Sumatran phytophagous lady beetle, Epilachna pytho was reared under laboratory conditions to study survivorship and fertility schedules. The species is found above 600 m from sea level, mainly depending on wild cucurbits such as Trichosanthes tricuspidata, T. ovigera, Gynostemma pentaphyllum, Mukia javanica and rarely occurring in cultivated fields of Sechium edule. The development of the immature stages of E. pytho required 33.6 days. The mean longevity of males ( 94.4 days) was shorter than that of females (106.3 days). The mean length of the pre-reproductive period (25.4 days) was longer than that of the post-reproductive period (3.6 days). Females laid eggs continuously throughout their reproductive period (77.3 days). The average number of eggs produced per female was 609.9. The intrinsic rate of natural increase r was 0.067 per capita per day. These life history traits ofE. pytho was similar to E. enneasticta, a non-pest species feeding on Solanaceae and living in high lands. E. pytho exhibited 1) longer immature stages, 2) longer mean length of the pre-reproductive period, 3) lesser fertility and 4) smaller r and larger T values than four pest epilachnine species, living at a wide elevational range.