Key to workers of Malagasy Aptinoma

1 In profile, metanotal groove distinct and set in shallow V-shaped impression (Figs 1 a, e). Propodeal dorsum more or less convex, meeting steeply sloped declivity in blunt, narrowly rounded curve. In dorsal view, lateral margin of pronotum evenly convex, without blunt angle at widest point (Figs 1 c, 2c). Body light to dark brown............................. ......................................................................................................................................................... Aptinoma antongil

- In profile, metanotal groove not set in a V-shaped impression (Figs 3 a, 4a). Propodeum in absolute profile without differentiated dorsal and declivitous surfaces, forming single evenly rounded surface. In dorsal view, lateral margin of pronotum with blunt angle at widest point (Figs 3 c, g). Body yellow to orange. ...................................................... ........................................................................................................................................................ Aptinoma mangabe