Abstract
In an earlier paper (Syme and Davies, 1958), three new species in the hirtipes-complex (Prosimulium fuscum Syme and Davies, P. mixtum Syme and Davies and P. fontanum Syme and Davies) were described, compared with related species in other parts of the world, and their known distribution in northeastern North America indicated. In this paper are presented observations on the manner and dates of oviposition, on incubation, on the larval feeding, on the rate of larval growth during the fall and winter in a spring-fed stream, and on differences in habitat and seasonal emergence of the three new species.
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