Key to females of the Afrotropical species of Plectiscus

1. Second metasomal tergite elongate, about 2.0× as long as wide, longitudinally striate to the apex (Fig. 1H). Antenna with 27 flagellomeres; first flagellomere 4.2× as long as wide. Mesosoma yellow ventrally (Fig. 1A)............ P. oblongus sp. n.

- Second metasomal tergite subquadrate, at most 1.2× as long as wide, longitudinally striate at most to the middle (Fig. 2I). Antenna with at most 22 flagellomeres; first flagellomere about 3.0× as long as wide. Mesosoma entirely brown (Fig. 2A)... ................................................................................................... 2

2. Antenna with 16–17 flagellomeres. Second metasomal tergite sculptured to the middle............ P. pomariorum (Seyrig)

- Antenna with 22 flagellomeres. Second metasomal tergite sculptured anteriorly (Fig. 2I)............... P. taitaensis sp. n.