Halictus productus Smith, 1853: 55, male [!]. Female holotype: Sierra Leone (BMNH). Schulz 1906: 239; Friese 1909:125, 128; Cockerell 1937: 96.
Halictus (Thrincostoma)[!] productus Smith: Vachal 1903: 393; Friese 1909: 128, 151–152.
Thrinchostoma productum (Smith): Cockerell 1908: 343–344.
Thrinchostoma productus (Smith): Strand 1912: 271.
Thrincostoma [!] productum (Smith): Blüthgen 1928: 164; Bluthgaen 1930: 496–497, 499, 537–539, 542.
Thrinchostoma (Thrinchostoma) productum (Smith): Medler 1980: 481; Michener 1978: 524; Pauly 1999: 155, 175.

Halictus (Thrinchostoma) bibundicus Strand, 1910: 43–44, MMM. Male holotype: Cameroun, Bibundi, leg. J. Weiler (Mus. Wiesbaden). Strand 1927: 62.
Thrincostoma (Thrincostoma) [!] bibundicus (Strand): Blüthgen 1930: 496–497, 499, 511–512, 514, 518, 534.
Thrinchostoma (Thrinchostoma) bibundicum (Strand): Michener 1978: 524; Pauly 1999: 155, 172.

Thrinchostoma tessmanni Strand, 1912: 271–272, MMM. Male lectotype : Equatorial Guinea (« Spanish Guinea »), Benitogebiet, Uelleburg, 1-14.II.1907, leg. Tessmann (MNHUB). Strand 1927: 114.
Thrincostoma [!] (Thrincostoma [!]) tessmanni Strand: Blüthgen 1930: 496–497.
Thrincostoma [!] bibundicum var. tessmanni (Strand): Blüthgen 1930: 517–518, 535.
Thrinchostoma (Thrinchostoma) bibundicum tessmanni (Strand): Michener 1978: 524; Pauly 1999: 155, 176.

Thrincostoma [!] (Thrincostoma [!]) grisescens Blüthgen, 1930: 529, 536, FFF. Female holotype: Cameroun, Bosum (“Hinterland von Kamerun am Uamfluss), 5.V.1914, leg. Tessmann (MNHUB). Blüthgen 1930: 542, syn.
Thrinchostoma grisescens Blüthgen: Pauly 1999: 155, 173.

Thrincostoma [!] (Thrincostoma [!]) bequaerti Blüthgen, 1930: 499, 518, 535, MMM. Male holotype: Liberia, Du River, Camp n03, 27.VII.1926, leg. Bequaert (RMCA).
Thrinchostoma (Thrinchostoma) bequaerti Blüthgen: Michener 1978: 524; Pauly 1999: 155, 172.

Thrincostoma [!] (Thrincostoma [!]) bequaerti var. ochropus Blüthgen, 1930: 518, 535, MMM. Male holotype: Liberia, Monrovia, 17.VII.1926, leg. M. Bequaert (RMCA).
Thrinchostoma (Thrinchostoma) bequaerti var. ochropus Blüthgen: Michener 1978: 524.
Thrinchostoma ochropus Blüthgen: Pauly 1999: 155, 175, syn.

Thrincostoma [!] (Thrincostoma [!]) vachali Blüthgen, 1930: 497, 539, FFF. Female lectotype : Gabon, Entre Sam Quito et Ndjolé, 1900, leg. J. Bouyssou (MNHNP).
Thrinchostoma (Thrinchostoma) vachali Blüthgen: Michener 1978: 524–525.
Thrinchostoma vachali Blüthgen : Pauly 1998: 45; Pauly 1999: 155, 177, syn.


Thrinchostoma lualiensis Cockerell, 1939: 242, MMM. Male holotype D.R. Congo, Luali, 26.VIII.1913, leg. Dr. Bequaert (RMCA).
Thrinchostoma (Thrinchostoma) lualiensis Cockerell: Michener 1978: 524; Pauly 1999: 155, 174, syn.

Diagnosis. Male. Gray black. Last segment of the antennae not bent, almost straight. Apical margin of sternite 5 glabrous. Notches on segments 8 to 12 of the antennae.
Female. Gray black. Abdomen black gray, without red spots but sometimes suffused brown. Scape of antennae entirely dark brown. Last terga with mixed clear and black setae. Tergite 1 finely striated with scarce punctures (i = 3d).

Notes :

T. bibundicum : the type has not been examined, but the color of the legs is quite variable among males of Thrinchostoma, so varieties with dark or orange legs are well conspecific.

T. tessmanni: Blüthgen separates this species according to the number of notches on the antennae. According to a photo of holotype taken at MNHUB, this seems to be an artifact. Marks begin on segmente 8 and not 6.