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 Orthocladius ( Orthocladius ) rubicundus (Meigen, 1818) Chironomus rubicundus Meigen, 1818: 35 . Material examined. 1♁ pinned,now mounted on slide, labelled:‘M.Goetghebuer det. Orthocladius rubicundus Meig // Orthocladius rubicundus Meig. // Virton, 2.IX.1921 // R . Mus. Hist. Nat. Belg. I.G. 14.228’; 1 ♁ in isinglass, now mounted on slide, labelled: ‘ O. rhyacophilus K. Brno (Zavrel) // R .I.SC.N.B. 18.073 / Coll. et det. M. Goetghebuer’. Comments. Both specimens have weak and reduced (about 30 μm long) dorsocentrals ( SOPONIS 1977 ) and genitalia compatible with O. ( O .) rubicundus ( ROSSARO et al. 2003 ) ; the shape of genitalia and the observation that all the other Orthocladius species known from the West Palaearctic possess more robust and longer (about 70 μm long) dorsocentrals allows us to assign both specimens to O. ( O. ) rubicundus .