Abstract
IT is well known to collectors of Hymenoptera that the males of the Thynnid, Methoca ichneumonides Latr., are extremely rare, whereas the females are sometimes relatively abundant. Neither sex is common and the insect is described by Sharp as “very rare.” It has been suggested that the males have been overlooked by collectors, that their life was short, and that their scarcity was only apparent. Recently I have been able to rear these insects in captivity, and my experiments show clearly that parthenogenesis does occur, a fact which readily explains the scarcity of the males.
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