Holarctic distributions in the genus Bibio, minus the Bibio clavipes-group, are discussed. The species Bibio brunnipes (Fabricius), Bibio rufipes (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 with Bibio brunnipes. Bibio velorum McAtee and Bibio columbiaensis Hardy are synonymized with Bibio rufipes. Bibio labradorensis Johnson and Bibio monstri James are synonymized with Bibio siebkei. The relationship between the Palaearctic Bibio pomonae (Fabricius) and the Nearctic Bibio holtii McAtee and Bibio bryanti Johnson is discussed. Bibio strobli Duda is tentatively retained as a good species. Diagnoses are given for each species and illustrations of the male fore tibia, hypopygia and hind leg and the female terminalia and head are given for comparison. The ecological preferences and flight periods of each species are commented on.