The proximal one of the two plates in the axillary area of the wing located at the extreme base of the costal margin. The basicosta is the distal one.
Synonym: epaulet.
Image given: hthttp://www.dgrc...tegula.gif
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?