The Australian species of Orthotrichia Eaton (Trichoptera : Hydroptilidae)

Abstract

The genus Orthotrichia Eaton. newly recognized from Australia, is represented here by 25 species of diverse structure, arranged in four species-groups based primarily upon the male genitalia. Twenty-four of the species are new while the remaining one is transferred to Orthotrichia from the monotypic Targa- trichia Neboiss, which is thus synonymized. The scope and diagnoses of Orthotrichia and some other hydroptilid genera are discussed briefly, with special reference to the relative importance of wing and genitalic characters.