Abstract
The internal reproductive systems of both sexes of Hydroperla crosbyi (Needham and Claassen) are generally similar to those of Arcynopteryx compacta (McLachl.). Sperm transfer is external, to a depression around the female genital opening formed by a 'packing action of the male epiproct during what appears superficially to be copulation. Sperm are deposited in the depression after a spontaneous aedeagal eversion lasting 0.5-1.5 min. The aedeagus does not function as an intromittent organ. Sperm are aspirated by the female after the releaser consisting of cercal brushing or tapping by the male. This represents a previously unreported means of sperm conveyance in the Plecoptera and among the Insecta. Potential contribution of reproduction knowledge to phylogeny in the Perlodidae is discussed.
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