Forel's (1916) description of Engramma kohli is
Features (from Wheeler's 1922 key) - TL 1.8 to 2.2 mm.
Head, without the mandibles, as broad as long, deeply excavated behind.
Eyes less than one-third of face in length. Antennal scapes not
reaching the occipital border; funicular joints 2 to 7 broader than
long. Body relatively thick set; dorsum of propodeum much shorter than
the declivity, sloping forward; pilosity less abundant. Dull yellow,
with brown gaster but head and thorax shining.
Wheeler (1922, with the illustration) noted collections
from - Niapu (Lang and Chapin); Lubutu to Kirundu; Tshopo River near
Stanleyville (J. Bequaert). The specimens from Niapu were taken in the
leaf ascidiae of Scaphopetalum thonneri De Wildeman and Durand;
those from Lubutu to Kirundu in the similar structures of Cola
laurentii De Wildeman; and those from the Tshopo River were found
nesting in the stem swellings of a hairy Plectronia. The type
specimens of the species were also taken by Father Kohl "in
myrmecophilous plants" at St. Gabriel, near Stanleyville.
Bolton (2007) appears to have lumped all specimens of
approximately the same general form, i.e. with a strongly cordiform
head and deep semi-circular clypeal notch into a single species Technomyrmex
laurenti (Emery). Although he acknowledges smaller specimens
have a higher SI and relatively larger eyes he does not give any
information on variation (if any) within specimens recorded from a
specific nest. Colour variation is discounted as of any significance.
I have sighted specimens from two sites (nests) in
Cameroun. The two nests were separate species of plant.The difference
in the worker morphology is consistent and so marked that I cannot
accept Bolton's lumping. Thus, the specimens of Technomyrmex kohli
are kept separate and shown below. They are an exact match for Forel's
decription - with no erect setae or evidence of setal insertions on the
alitrunk, apart from two pairs on the pronotum and a pair at the apex
of the propodeum. They have a very different pattern of pubescence to laurenti;
and, are much shinier and generally lighter. This is supported by the 2103 availability of a cotype images on Antweb (below).