Baeotendipes, Genus
Baicalosergentia, Subgenus (Sergentia)
Bavarismittia, Genus
Beckidia, Genus
Boreochlini, Tribus
Boreochlus, Genus
Boreoheptagyia, Genus
Boreoheptagyini, Tribus
Boreosmittia, Genus
Brillia, Genus
Bryophaenocladius, Subgenus (Bryophaenocladius)
Bryophaenocladius, Genus
Buchonomyia, Genus
Buchonomyiinae, Subfamilia