Revision of type and non-type material assigned to the genus Orthocladius by Goetghebuer (1940 - 1950), deposited in the Royal Belgian Institute of Natural Sciences (Diptera: Chironomidae) Author Magoga, Giulia ) &) &) Università degli Studi di Milano, Dipartimento di Scienze Agrarie e Ambientali (DISAA), via Celoria 2, I 20133, Milano, Italia; e-mails: giulia. magoga @ unimi. it; matteo. montagna @ unimi. it Author Montagna, Matteo ) &) &) Università degli Studi di Milano, Dipartimento di Scienze Agrarie e Ambientali (DISAA), via Celoria 2, I 20133, Milano, Italia; e-mails: giulia. magoga @ unimi. it; matteo. montagna @ unimi. it Author Marziali, Laura ) &) Water Research Institute, National Research Council (IRSA-CNR), Via del Mulino 19, I 20861 Brugherio (MB), Italy; e-mail: marziali @ irsa. cnr. it Author Rossaro, Bruno ) &) Università degli Studi di Milano, Dipartimento di Scienze per gli Alimenti, la Nutrizione e l’Ambiente (DeFENS), Via Celoria 2, I 20133 Milan, Italy; e-mail: bruno. rossaro @ unimi. it Author Disaa text Acta Entomologica Musei Nationalis Pragae 2017 Acta. Ent. Mus. Natl. Pragae 2017-12-31 57 2 723 749 http://dx.doi.org/10.1515/aemnp-2017-0097 journal article 10.1515/aemnp-2017-0097 0374-1036 5318416 638421F2-985E-43CC-8438-E871F96B1DB8 Cricotopus ( Paratrichocladius) rufiventris (Meigen, 1830) Chironomus rufiventris Meigen, 1830: 249 . Trichocladius dentifer Goetghebuer, 1935: 7 . Material examined. Trichocladius dentifer : LECTOTYPE : ♁ (slide) labelled:‘ Trichocladius dentifer n sp // Röserenbach Geijskes // Type ♁ / M. Goetghebuer // alpestris Goetgh. det. M. Hirvenoja // Holotypus reconnu par M. Hirvenoja 1968’. PARALECTOTYPE : ♀ (slide) labelled: ‘ TRICHOCLADIUS dentifer Gtgh. // R .I.Sc.N.B.18.073 / Coll. et det. M. Goetghebuer // Allolectotypus reconnu par M. Hirvenoja 1968’. Comments. HIRVENOJA (1973: 89) identified one female from the type series of T. dentifer as Cricotopus curtus Hirvenoja, 1973 , and one male and two females as Paratrichocladius rufi- ventris , designating the male as lectotypus (labelled Holotypus ) and one female as paralectotypus (labelled Allolectotypus ). The slides were reexamined and the synonymy is confirmed.