Key to species of Concavifer

1 Vertex without distinctive 12 oval brown spots. Branches of aedeagus not sinuate laterally, with appendages on outer side preapically and inner side with a tooth medially. Subgenital plate with few scattered hair-like setae. ............................................. .................................... C. marmoratus Dlabola, 1960

‒ Vertex with distinctive 12 oval brown spots. Branches of aedeagus sinuate laterally, with a small projection dorsally and inner side without a tooth medially. Subgenital plate with numerous hair-like setae. ......... ........................................ C. bolkarensis Kartal, 1982