Key to genera of Malagasy Solenopsidini (males)

Key to genera of the tribe Solenopsidini (subfamily Myrmicinae) in the Malagasy region based on males (from Ramamonjisoa et al., 2023).

1

In full-face view, pedicel subglobular; posteromedian margin of clypeus effaced so that clypeus and frons form a continuous surface (Fig. 9A); mandible triangular with distinct basal angle, masticatory margin with exactly 4 teeth => Erromyrma
In full-face view, pedicel not globular, more cylindrical; posteromedian margin of clypeus visible (Fig. 9B); mandible spatulate to triangular, but its basal angle always indistinct, masticatory margin with 1 to 4 teeth => 3

Ramamonjisoa et al. (2023), Figure 9. Head in full-face view showing the pedicel, mandible, postero-median margin of clypeus. A, Erromyrma latinodis (CASENT0788835). B, Syllophopsis cryptobia (CASENT0103340).

Forewing with five closed cells, 1m–cu cross-vein present (Fig. 10A). In profile, petiolar peduncle longer than postpetiolar length (Fig. 10C) => Syllophopsis
Forewing with four closed cells, 1m–cu cross-vein absent (Fig. 10B). In profile, petiolar peduncle absent or shorter than postpetiolar length (Fig. 10D) => 4

Ramamonjisoa et al. (2023), Figure 10. In profile view showing forewing, petiole and post petiole. A, C, Syllophopsis modesta (CASENT0135642). B, Monomorium termitobium (CASENT0135673). D, Monomorium termitobium (CASENT0135952).

With the head in full-face view, antennal scape short, barely reaching the posterior ocular margin; mandible long, curved, masticatory margin with 3 to 4 teeth (Fig. 11A) => Monomorium
With the head in full-face view, antennal scape long reaching the occipital margin; mandible short, spatulate, basal margin linear, unidentate (Fig. 11B) => Adelomyrmex (Seychelles)

Ramamonjisoa et al. (2023), Figure 11. Head in full-face view showing mandible and scape. A, Monomorium exiguum (CASENT0135614). B, Adelomyrmex sc01 (CASENT0160764).