Setae placed lateral of the median area of the mesonotum; meaning that they are placed lateral of the acrostichal setae (if these latter are present). If the mesonotum is completely covered with smaller and larger setae, then dorsocentral setae should be distinguishable by their larger size compared to the immediate surrounding setae. Dorsocentral setae may be pre-sutural (in front of the suture) or post-sutural (behind the suture).
Anyone has "Chironomidae of the Holarctic region. Keys and diagnoses. Part 3. Adult Males Entomologica Scandinavica Supplement 34"?
smolwaarneming@gma il.com
Does someone has a scan of Nartshuk E.P. 2003. Key to families of Diptera (Insecta) of the fauna of Russian and adjacent countries. Proceedings of the Zoological Institute Vol. 294: 1-252 for me?