SOME BIOLOGICAL NOTES ON PSEUDOXENOS IWATAI ESAKI (IV) ADDITIONAL NOTES ON ITS BIOLOGY AND LIFE HISTORY

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Further notes on the biology and life history of Pseudoxenos iwatai Esaki are given. This is a common stylopid parasitic to Eumeninae in Japan. Most of the data in this paper were obtained in Ina Valley, Nagano Prefecture, in 1963 and 1964 by culturing stylopized host wasps. The host wasps were supplied by trap nests (reed tubes) which were set at 17 places in the Valley. Full-grown larvae of the male stylopids extruded in 1-4 days and those of female ones in 6-13 days after emergence of the adult host wasps. The pupal period of the male stylopids took 8-14 days after their extrusion between host abdominal terga, but that of the female ones was uncertain. Percentage of stylopism by this species was highest on Anterhynchium flavomarginatum micado (Kirsch) and was 10.1% (in 1963) or 27.5% (in 1964). The sex ratio of the female to the male was 1.0 : 1.3. The predominancy of the male over the female was observed in P. iwatai as well as in Xenos. The maximum parasitic number of the stylopids on one host was 6. The female and male stylopids extrude predominantly between abdominal terga 3-4 and 4-5, respectively. In case of polystylopism, the aberrant parasitic positions occurred more frequently than in monostylopism.
1971-07-30