Key to the known species of Adelotropis W ATERSTON

1 Scutellum with a very long central spine (fig. 21); fore and middle legs with ivory coloration on coxae, femora and tibiae; general coloration reddish including the propodeum (fig. 4) ................................................. A. spinosus RIEDEL & DAL POS, nov.sp.

- Scutellum with a short tooth; fore and middle legs with reduced or absent ivory coloration; general coloration darker with thorax dark ferrugineus and propodeum infuscate or black. ...............................................................................................................2

2 Area superomedia sickle-shaped, 2.7x wider than long (fig. 15). Mesosoma with reduced red coloration; fore and middle coxae with ivory spots, hind coxa black; hind tibial spur dark..................................................... A. gabonense RIEDEL & DAL POS, nov.sp.

- Area superomedia hexagonal, 1.5x wider than long; Mesosoma almost completely red, propodeum more or less infuscate; fore and middle coxae without ivory spots; hind coxa pale apically; hind tibial spur pale ......................... A. farquharson WATERSTON, 1922