Halictus torridus Smith, 1879: 32, FFF. Female holotype : South Africa (BMNH). Friese 1911: 651; Blüthgen 1928: 164.
Thrinchostoma torridum (Smith): Cockerell 1916: 205–206; Cockerell 1920: 304–305, syn. nomiaeformis; Cockerell 1933: 23–24; Cockerell 1936: 9; Cockerell 1937: 11; Cockerell 1937: 96; Cockerell 1941: 510; Michener 1969: 490; Pesenko 1997: 479; Danforth et al. 2008: 95.
Thrincostoma [!] torridum (Smith): Blüthgen 1930: 496–497, 499–500, 516, 519–520, 531–532, 537–538, 542;
Thrinchostoma (Eothrincostoma) torridum (Smith): Michener 1978: 523; Medler 1980: 481; Pauly 1999: 155–156, 177.

Nomia producta Smith, 1875: 66, 70–71, MMM [not Nomia producta Smith, 1953]. Male holotype : South Africa, Natal, Transvaal, Zeerust (BMNH). Cockerell 1908: 145; Friese 1909: 153, 160, 161; Blüthgen 1928: 164; Blüthgen 1930: 496.
Thrinchostoma (Eothrincostoma) producta (Smith): Blüthgen 1930: 537, syn.; Michener 1978: 521–522, 524; Pauly 1999: 156, 175, syn.
Nomia (Thrinchostoma) producta Smith: Friese 1941: 99.
Thrinchostoma (Thrinchostoma) productum (Smith): Michener 1978b: 524 [incorrectly placed].
Thrinchostoma (Eothrincostoma) productum (Strand): Michener 2000: 370.
Thrinchostoma producta (Strand): Roubik 1989: 414.

Thrinchostoma nomiaeformis Cockerell, 1908: 145 [unnecessary replacement name for Nomia producta Smith, 1875]; Cockerell 1920: 304–305; Blüthgen 1930: 537, syn.; Pesenko 1997: 479, 502.
Thrinchostoma (Eothrincostoma) nomiaeformis Cockerell: Pauly 1999a: 156, 175.

Thrinchostoma wellmanni Cockerell, 1908: 84–85, FFF. Female holotype : Angola, Benguella (BMNH); Cockerell 1908: 343; Cockerell 1937: 10.
Halictus (Thrinchostoma) wellmanni (Cockerell): Friese 1909: 128, 152.
Thrinchostoma (Eothrincostoma) wellmanni (Cockerell): Cockerell 1933: 23; Michener 1978: 523; Pauly 1999: 155, 177.
Thrincostoma [!] (Eothrincostoma) wellmanni (Cockerell): Blüthgen 1930: 496, 499, 541.

Halictus patricius Strand, 1911d: 141–142, female holotype (ZMHB, RMCA) Democratic Republic of the Congo; Cockerell 1920: 312; Blüthgen 1928: 164; Blüthgen 1930: 538; Cockerell 1937: 101.
Thrinchostoma patricius (Strand): Blüthgen 1928: 164; Cockerell 1937: 11.
Thrinchostoma (Eothrincostoma) patricius (Strand): Blüthgen 1930: 496, 499, 519–520, 530–531, 538, 541; Michener 1978b: 523; Pauly 1999: 156, 175, syn.

Thrinchostoma (Eothrincostoma) manyemae Cockerell, 1933: 23, MMM. Male holotype : D.R. Congo, Manyema, leg. Mayné (RMCA). Michener 1978: 523; Pauly 1999: 156, 174, syn.

Thrinchostoma malelanum Cockerell, 1937: 10–11, FFF. Female holotype : D.R. Congo, Pangula near Malela, Chief Kasende, 5°40’S 23°45’E, leg. J. Bequaert (AMNH).
Thrinchostoma (Eothrincostoma) malelanum Cockerell: Michener 1978: 523; Pauly 1999: 155, 174.

Remark:
Halictus patricius Strand 1910: 141, FFF. Holotype FFF: without locality (MNHUB). The female holotype is actually a Zonalictus ! This species is therefore excluded from the genus Thrinchostoma where Blüthgen (1930 : 519, 520, 531, 538) has placed them.

The type of T. malelanum has malar area and clypeus alittle longer. It could be a distinct species, one that Blüthgen had wrongly identified as T. patricium.

Some females from Congo, Cameroon and Gabon have a black metasoma with black setae in the middle of last terga. They represent a variety or a distinct subspecies.