Crematogaster (Crematogaster) nigrans Forel

Type location Zaïre (Cremastogaster foraminiceps Sant. r. nigrans n. st., Forel, 1915c: 338, worker & queen; raised to species by Santschi, 1921c: 117, misspelt nigricans), collected at St Gabriel, by Kohl; worker and queen described (see Bolton, 1995) .

Forel' s (1915c) description of nigrans was -
WORKER: TL 3.5-4.2 mm; almost entirely black, with appendages dark brown, distinguishing it from foraminiceps and godfreyi [godefreyi a strips of sjostedti]. Petiole considerably wider with sides with anterior prominences well developed and rounded; wider than long. Postpetiole whole, as in kneri, without a longitudinal notch or posterior scalloping. Other aspects as in the type, propodeal spines a little narrower but as long as the type.
FEMALE: TL 8.6 mm; dark brown with funiculi, tarsi and sides of head and thorax reddish; propodeum with no more than obtuse tubercles; wings with rust tint; sculpture feebler than workers; hair pits on head much more effaced.
Collected from a hollow branch at St. Gabriel, Kisangani, Zaïre, by Kohl.

Santschi (1921c: 117), was writing about Crematogaster (Sphaerocrema) phoenix and had that as (my translation) "close to Cr. nigricans (= Cr. foraminiceps Sants st. nigricans Forel) but that, which may be a Sphaerocrema, has sculpture like that of foraminiceps, i.e. more feeble, more irregularly striate and the eyes set further forward.
Reading Forel's description, i.e. postpetiole whole as in kneri (also a Sphaerocrema), suggests this is misplaced as regards the subgenus.