Key to world species of Caenocrepis (both sexes):

1 Clypeus with unusually large lobes (Fig. 14) [Afrotropical]................................. C. formidolosa sp. nov.

- Clypeus without unusually large lobes, though clearly incised (Fig. 13) [Palaearctic and Afrotropical].................. 2

2(1) Fore wing less densely pilose, with a narrow bare band behind marginal vein and hairs on disc sparser (Fig. 16) [Palaearctic]................................................................................. C. bothynoderi Gromakov

- Fore wing densely pilose, without bare space behind marginal vein and hairs on disc denser (Figs 15, 17, 18) [Palaearctic and Afrotropical]........................................................................................ 3

3(2) Female: antennae inserted very slightly above lower margin of eyes, scape not reaching median ocellus (Fig. 11); eye obviously narrowing in lower part (Fig. 7); body with metallic reflections stronger, bluish; fore wing hyaline (Fig. 17); metasoma shorter than mesosoma (Fig. 7). Male: eye small, temple very wide (Fig. 8) [Afrotropical]............ C. simonae sp. nov.

- Female: antennae inserted well above lower margin of eyes, scape reaching median ocellus (Fig. 5); eye oval (Fig. 1); body mostly without metallic reflections, blackish; fore wing usually infumate (Fig. 15); metasoma longer than mesosoma (Fig. 1). Male: eye normal, temples not unusually wide (Fig. 2) [Palaearctic]........................... C. arenicola (Thomson)