The last major review of the British Hydroptilidae was made by Mosely (1939), who described the males and ten females of the 27 species then known in his handbook to the British Trichoptera. Hydroptila lotensis Mosely and Ithytrichia clavata Morton have since been added to the list, while Kimmins (1958) reviewed the British species of the genus Oxyethira (excluding mirabilis Morton), re-illustrating the male genitalia and describing the females of all but distinctella McLachlan for the first time. Apart from Kimmins’s (1966) checklist, and Macan’s (1973) key to the British Trichoptera, which simply reproduces Mosely’s (1939) and Kimmins’s (1958, 1961) original figures, very little has been published lately on adult hydroptilids. Recent studies on the family (Marshall, 1977) have added two more species to the British list, Hydroptiia martini Marshall and H. valesiaca Schmid, which were both previously confused with H. occulta (Eaton), so that the total number now stands at 31.
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