The life history was studied during 1981-1985, using natural populations and reared specimens. The flying season lasts from late May to mid Sept., reproductive behavior was observed between mid-June and mid-Sept, The average egg stage duration was 10 days (at 21-33° C), or 20 days (at 11-32° C, in the laboratory). Two modes of larval development were discerned. U nivoltine larvae developed slowly and hibernated usually between the F-3 and F-l instars; the ultimate (i.e. the 10th, prolarva excl.) instar appeared in the next spring and the adults emerged between late May and mid July. Bivoltine larvae hatched about June 24, reached the final (9th) instar between late July and early Aug., and the adults emerged during Aug. and early Sept. The latter were smaller than those from the univoltine larvae. The antennal development is of the BBBA type of K. MIYAKAWA (Odonatologica 6 [1977J 173-180).


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Societas Internationalis Odonatologica

H. Naraoka. (1987). Studies on the ecology of Cercion sieboldi (Selys) in the Aomori Prefecture, northern Japan. I. Life history and larval regulation (Zygoptera: Coenagrionidae). Odonatologica, 16(3), 261–272.