At Hagi-district, Honshu, Chilocorus kuwanae Silvestri, an important natural enemy of Unaspis yanoneneis (Kuwana), has three generations a year. The duration of the larval stage is 18 days in May and 14 days in August. The pupal stage lasts for 11 days in May and 9 days in August. During the warmest part of the summer the longevity of the adults is shorter than 10 days. The length of life of the adults emerged from the late summer to autumu is longer then two months and no doubt certain overwintering individuals survive even longer. During the larval period one larva may consume or feed on 98 individuals of Unaspis yanonensis in May and 117 prey in August. One adult beetle may feed on 44 scales in July and 392 scales in August until its death. The total number of scales fed by the overwintering adult attains as many as 1035 individuals of scales. The female prefer to oviposit in the dusky site. There seems to exist rather high correlation between the prey consumed and the copulation or oviposition. If this Coccinellid is free from the severe attack of its parasites (Homalotylus flaminus and one species of Tetrastichus), it may play an important role in the control of Unaspis yanonensis, one of the most serious pests of citrus in Japan.
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