HOLARCTIC DISTRIBUTIONS IN THE GENUS BIBIO (DIPTERA, BIBIONIDAE)

Holarctic distributions in the genus Bibio, minus the Bibio clavipes-g roup, are discussed. The species Bibio brunnipes (Fabricius), Bibio ru fipes (Zetterstedt) and Bibio siebkei Mik are found to have Holarctic distributions. Bibio fulvipes (Zetterstedt), Bibio fumipennis Walker, Bibio tenellus Hardy, and Bibio rufitibialis Hardy are synonymized wit h Bibio brunnipes. Bibio velorum McAtee and Bibio columbiaensis Hardy are synonymized with Bibio rufipes. Bibio labradorensis Johnson and Bi bio monstri James are synonymized with Bibio siebkei. The relationship between the Palaearctic Bibio pomonae (Fabricius) and the Nearctic Bi bio holtii McAtee and Bibio bryanti Johnson is discussed. Bibio strobl i Duda is tentatively retained as a good species. Diagnoses are given for each species and illustrations of the male fore tibia, hypopygia a nd hind leg and the female terminalia and head are given for compariso n. The ecological preferences and flight periods of each species are c ommented on.