Aenictus villiersi BERNARD, 1953: 221, fig. 7 (w.)

Syntypes, GUINEA: forêt du Nimba nord est, 700 m. ix-1946 (Villiers) (4w) [EY9136, EY20210, EY20211, EY20212]. Material examined and remounted on four different pins, EY9136 with original labels.

DESCRIPTION (Fig. 9 A–D). WORKER: HL: 0.71 [0.70-0.73]; HW: 0.72 [0.70-0.74]; SL: 0.7 [0.69-0.72]; WL: 1.21 [1.14-1.26]; PL: 0.27 [0.26-0.28]; PH: 0.21 [0.21-0.22]; PPL: 0.23 [0.21- 0.23]; PPH: 0.18 [0.17-0.18]; CS: 0.71 [0.7-0.72]; CI: 101 [98-105]; SIL: 99 [95-102]; SIW: 97 [94-102]; WL/HW: 167 [163-170]; PI: 125 [118-133]; PPI: 128 [116-135]; CSR: 102; (n=4).

Aenictus villiersi fits the description of A. batesi and A. decolor, except for SIL considerably larger, the biggest of all the Afrotropical species (~100), subpetiolar process considerably smaller and shaped as a quarter of ellipse with its vertical side oriented forward, instead of subrectangular as in the other two sibling species. Petiole with dorsolateral ridges small but present, extending to the spiracle; in dorsal view forming a small flat platform differentiable from petiolar node (this character also present in some A. decolor samples). Also see discussion under A. bidentatus.

OTHER MATERIAL EXAMINED. GUINEA: • Nzérékoré, Forêt Mt Leclerc (Mount Nimba), 7.66878, -8.41697 19/04/2017. Monolithe (Kolo, Y.). Forest (1w) [KY00118GUI] YKPC.

DISTRIBUTION. West Africa, known only from one location, Mount Nimba in Guinea (Fig. 10).