The purpose of this application, under Article 75.6 of the Code, is to set aside all previous fixations of name-bearing types for the species Tipula marciLinnaeus, 1758 and Tipula febrilisLinnaeus, 1758 (currently Bibio marci and Dilophus febrilis, the St. Mark's fly and the fever fly, respectively) and to designate neotypes in their place. Illustrations in pre-Linnaean works cited by Linnaeus in connection with these names are unidentifiable, and extant Linnaean syntypes of these two nominal species belong to other species than those for which the names have been consistently used since the early 19^th century.