Macropelopia aeruginosa Kieffer, 1924 – synonym of Macropelopia adaucta
Macropelopia ciliatimanus Kieffer, 1916 in Thienemann and Kieffer, 1916 – synonym of Macropelopia nebulosa
Macropelopia hirtipes Kieffer, 1921 – synonym of Macropelopia nebulosa
Metriocnemus aestivalis Goetghebuer, 1921 – synonym of Heterotrissocladius marcidus
Metriocnemus alticola Goetghebuer, 1934 – synonym of Heterotrissocladius marcidus
Metriocnemus ampullaceus Kieffer, 1923 – synonym of Paraphaenocladius impensus
Metriocnemus angulatus Goetghebuer, 1921 – synonym of Paraphaenocladius impensus
Metriocnemus auripilus Goetghebuer, 1921 – synonym of Metriocnemus fuscipes
Metriocnemus bifidus Kieffer, 1909a: p. 48 – synonym of Brillia modesta
Metriocnemus cavicola Kieffer, 1921 – synonym of Metriocnemus martinii
Metriocnemus cubitalis Kieffer, 1911 (a questionable synonymy) – synonym of Heterotrissocladius marcidus
Metriocnemus irritus var. Edwards, 1929 ; Brundin, 1947a: p. 12 – synonym of Paraphaenocladius pseudirritus
Metriocnemus longicollis Kieffer, 1913 (a questionable synonymy) – synonym of Heterotrissocladius marcidus
Metriocnemus subtangens Kieffer, 1911 – synonym of Metriocnemus fuscipes
Metriocnemus triangulifer Kieffer, 1924 (a questionable synonymy) – synonym of Heterotrissocladius marcidus
Microlenzia fusca Kieffer, 1925 – synonym of Thienemanniella acuticornis
Micropsectra dentatilobus Kieffer, 1925 – synonym of Micropsectra apposita
Micropsectra foliata Laville, 1965 – synonym of Micropsectra lindrothi
Microtendipes coracellus Kieffer, 1918 – synonym of Tribelos intextus
Microtendipes ureshinoense Sasa, 1979 – synonym of Polypedilum cultellatum
Monodiamesa flabellata Kieffer, 1926 in Zavrel, 1926 – synonym of Odontomesa fulva
Monotanytarsus stilatifrons Kieffer, 1924 – synonym of Paratanytarsus austriacus