Key to genera of Systellopini (males only)

(modified from Allsopp 1990)

1 Antennal club with 3 long lamellae (Figs. 1–2); labrum fused with clypeus dorsally (visible only at lateral declivity) (Figs. 4–5); clypeus widest at base, non-emarginate before ocular canthus (Figs. 4–5)..................................................................................................... Liomenochilus Hutchinson & Allsopp, new genus

- Antennal club with 5, 6 or 7 long lamellae (Figs. 19–24); labrum clearly separated from clypeus by a suture (Figs. 19–24); clypeus constricted at base (Figs. 19–24)................................................................... 2

2 Lamellae of antennal club fringed with long, pilose filaments (Figs. 18, 22).............. Sarothromerus Blackburn, 1907

- Lamellae of antennal club setose or glabrous (Figs. 19–21, 23–24).............................................. 3

3 Labrum short, length:width ratio <0.3:1 (Figs. 17, 24); metafemora strongly dilated, length:width ratio <1.3:1............................................................................................ Systellopus Sharp, 1877

- Labrum longer, length:width ratio> 0.3:1 (Figs. 12–16, 19–21, 23); metafemora less strongly dilated, length:width ratio> 1.4:1............................................................................................... 4

4 Antennal club with 5 lamellae, inner faces of lamellae glabrous................................................. 5

- Antennal club with 5, 6 or 7 lamellae, inner faces of lamellae setose............................................. 6

5 Canthus at level of middle of eye, frons narrow (Figs. 12, 19); dorsal labrum with transverse ridge dividing rugose anterior third from smooth posterior portion (Fig. 19); posterior portion of epipleurae spinose (Fig. 12); disc of pronotum glabrous (Figs. 12, 19).............................................................................. Chilodiplus Sharp, 1877

- Canthus well above level of middle of eye, frons wide (Figs. 16, 23); dorsal labrum with reflexed anterior and lateral margins forming a continuous ridge (Fig. 23); posterior portion of epipleurae without spines (Fig. 16); disc of pronotum setose (Figs. 16, 23)........................................................................... Sphyrocallus Sharp, 1877

6 Disc of pronotum glabrous (Figs. 14, 21), antennal club with 5 or 6 lamellae................. Prochelyna Erichson, 1847

- Disc of pronotum at least with patch of setae in anterolateral angles, usually across entire pronotal disc but possibly effaced (Figs. 13, 20); antennal club with 5, 6 or 7 lamellae........................................ Enamillus Sharp, 1877