Key to Cyrtonion species

1a. Median lobe of the aedeagus rounded apically. Aedeagus and median lobe rather wide (Fig. 1). .............................................................................................. C. moto sp. nov.

1b. Median lobe of the aedeagus pointed apically.Aedeagus and median lobe narrower (see FIKÁČEK 2006, Fig. 17). ............................................................................................... 2

2a. Lateral margins of the apical part of the median lobe straight, apex more sharply pointed (Fig. 3). ............................................................................... C. ghanense Hansen, 1989

2b. Lateral margins of the apical part concave, apex more obtuse (Fig. 4). ........................ ................................................................................. C. sculpticolle (Régimbart, 1907)