Key to Aristaenetus Distant, 1901

1 Anterolateral trichobothria on pronotum absent, collar punctate; humeral pronotal angles angular (subg. Kmentaenetus) 2

– Anterolateral trichobothria on pronotum present; pronotal collar impunctate, separated by a row of punctures; humeral pronotal angles rounded (subg. Aristaenetus s. str.) see WOODWARD & O'DONNELL (1988)

2 Body black; apex of clypeus acuminate; humeral angle acutely extending laterally, terminating in a posteriorly directed spine; punctures not very strong; hemelytra piceous with some unconspicuous small paler areas; tiny stramineous spot near apical margin of corium not reaching vein R, smaller than eye; membrane nearly unicolorous brown; meso- and metatibiae brown A. diabolicus

– Body black and brown; apex of clypeus acute; humeral angle bluntly extending laterally; punctures strong; hemelytra with contrasting stramineous spots; significant subapical stramineous spot of corium reaching lateral margin, bigger than eye; membrane dark brown with stramineous apex; meso- and metatibiae stramineous in apical half A. woodwardi