Key to the Afrotropical species of Sirthenea

1 Pronotum uniformly black or dark brown, or posterior pronotal lobe only slightly paler than anterior lobe (Figs. 194–196)2

– Pronotum bicolorous (anterior pronotal lobe distinctly paler) or unicolorous (light brown to yellowish)............... 3

2 Scape surpassing apex of head (Fig. 153).................................. S. (Monogmus) picescens Reuter, 1887

– Scape at most reaching apex of head.................................... S. (Sirthenea) flaviceps (Signoret, 1860)

3 Hemelytron without yellow markings in basal part; membrane unicolorous, dark (Fig. 197), four trichobothrial setae on pedicel (Fig. 172).................................................. S. (Sirthenea) rodhaini Schouteden, 1913

– Hemelytron with yellow markings in basal part, membrane dark with pale apical part (Fig. 193), six trichobothrial setae on pedicel (Fig. 169)..................................................... S. (Sirthenea) africana Distant, 1903