For terms see Morphology of DipteraLateral dust spots on frons conspicuous. 3rd antennomere (basoflagellomere) elongate, 2-3 times as long as broad. Male coxa 2 and trochanter 3 without spurs. Abdomen tergites black. Abdomen elongated. 1 with a shiny, pale pit; 2 without keel. Thorax dorsum with long white hairs. Face mostly black-haired. The male genitalia are figured by Delucchi and Pschorn-Walcher (1955).Delucchi, V. & Pschorn-Walcher, H. (1955) Les especes du genre Cnemodon Egger (Diptera, Syrphidae) predatrices de Dreyfusia (Adelges) piceae Ratz., Hem. Adelgidae). 1. Revision systematique et repartition geographique des especes du genre Cnemodon Egger. Z.angew.Ent., 37: 492-506. Delucchi et al (1957) figure the larva.Delucchi, V., Pschorn-Walcher, H. & Zwolfer, H. (1957) Morphologie und Biologie von Cnemodon dreyfusiae D. & P.W. nebst Beobachtungen uber C.latitarsis Egger. Z.angew.Ent., 41:246-259.
