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Try to find a help in the voluminous papers of Kirg-spriggs and Wiegman. I quote only the last one, where you can find references to preceding papers.
Kirk-Spriggs A.H & Wiegmann B. M. 2013: A revision of Afrotropical Quasimodo flies (Diptera: Schizophora; Curtonotidae). Part IV. The continental Afrotropical species of Curtonotum Macquart, with descriptions of thirteen new species and a combined phylogenetic analysis of the Curtonotidae. Zootaxa 3684 (1): 1-166.