The mesonotum is composed of three parts: the prescutum (not differentiated in most Diptera, except for some Nematocera), the scutum and the scutellum. The largest of these three is the scutum which is usually divided by a suture in an anterior part and a posterior part, the presutural and postsutural areas, respectively.
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?