Cataulacus difficilis Santschi

Type location Benin (Cataulacus pygmaeus André stirps difficilis n. st., Santschi, 1916b: 506, worker; raised to species status by Bolton, 1974a) collected from Dahomey, Desanti; known solely from holotype worker .

Santschi's (1916b) description is at . Bolton's modern description (1974a) is at

WORKER - TL 3.3 mm; separated from Cataulacus taylori by dull appearance and weaker rugae on dorsum; strong mesokatepisternal tooth.

The photomontage of the type worker is collated from http://www.antweb.org/specimen.do?name=casent0912546

Oxford University Museum specimens

Cataulacus difficilis B Taylor det. Queen	Ivory Coast Erena Dupont iv.2014	Taï National Park 5˚45'00" N 7˚07'00" W	07	1
Cataulacus difficilis B Taylor det.	Benin J-F Vayssieres RVA 3004.3	5.xi.2012 Béthel 8°00'13'' N 02°22'57'' E	On Poacae	1

The photomontage is of a worker from Benin, Béthel, J-F Vayssieres (RVA 3004.3). Slightly larger than the type worker above.

The photomontage is of a queen from Ivory Coast, Tai, Erena Dupont. Probable queen based on the similarity of the head and pedicel segments.

Note: The photomontage of a worker from Cameroun, part labelled by Bolton (but not listed in Bolton, 1982, where the distribution in the key still has solely "Benin Republic") and on http://www.antweb.org/specimen.do?name=casent0280807 , is a match for Cataulacus taylori.