STUDIES ON THE LYGAEIDAE. VI : Biological notes on Metochus abbreviatus Scott (Hemiptera)

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In this paper, some observations on the bionomics and the developmental stages of Metochus abbreviatus Scott (Hem.; Lygaeidae) are given. As a rule, the present species hibernates as an adult stage under the fallen leaves, the bark of trees, and among the bushes, etc. After overwintering, the adult bug begins to appear from the end of March to middle of April. Eggs are laid transversely one by one under the fallen leaves and sometimes on the upper surface of the fallen leaves. The duration of each developmental stage of the bug is as follows : Egg-two weeks, the 1st instar-about 10 days, the 2nd instar-two weeks, the 3rd instar-12 days, the 4th instar-10 days, and the 5th instar-12 days. The number of eggs laid by a single female is 47 on an average. As the average length of one generation is 38 days, this bug may pass three generations throughout a year. The food plants so far investigated are dropped seeds of the maple tree, the camphor tree, and of such grasses as Digitaris sanguinaris var. ciliaris Doell and Setaria viridis Beauvois (Poeaceae). etc., but sometimes cannibalism may occur among the adults and larvae in the breeding cages owing to the shortage of food.
日本昆虫学会の論文
1959-09-30