1. Anterior spiracle black to fuscous (not recorded from Namibia)......................................................................................... C. bezziana Villeneuve & C. megacephala Fabricius

­ Anterior spiracle white to yellow.................................................................................. 2

2. Face, 1 st flagellomere and anterior part of fronto­orbital plate bright yellow and orange; wing margin broadly infuscate......................................................................... 3

­ Face and fronto­orbital plate blackish in ground colour; 1 st flagellomere blackish except for joints of pedicel reddish; wing hyaline, sometimes more or less infuscated basally........................................................................................................................... 4

3. Head dichoptic in ♂; upper facets of ♂ eye not strikingly large and sharply demarcated; fronto­orbital plate broad, reddish brown anteriorly, darkened posterior half to ⅔ in both sexes; lower calypter largely pale brown, narrowly infuscated along posterior margin ............................................................................. C. laxifrons Villeneuve (p. 76)

­ Head holoptic in ♂; upper facets of ♂ eye strikingly and sharply demarcated; frontoorbital plate very narrow in ♂, broad and entirely reddish brown in ♀; lower calypter largely blackish along posterior margin.......................................................................... ....................................................................... C. marginalis Robineau­Desvoidy (p. 76)

4. Proepimeral bristle present; genal dilation entirely blackish in ground colour; ov absent in ♂..................................................................................................................... 5

­ Proepimeral bristle absent; anterior half or more of genal dilation usually reddish in ground colour; ov developed in ♂ ............................... C. albiceps (Wiedemann) (p. 74)

5. Presutural area of scutum with distinct L­shaped dark pattern on each side; presutural dc weak and inconspicuous; tergites 4–5 brassy green and contrasting with bluish preceding segments ..................................................... C. chloropyga (Wiedemann) (p. 75)

­ Presutural area of scutum without L­shaped pattern on each side, but with lateral spots; presutural dc developed; tergites 4–5 concolorous with preceding segments................ ...................................................................................... C. putoria (Wiedemann) (p. 78)