Diagonozus bicometes Enderlein, 1903b: 37, three male syntypes. Male lectotype : Cameroun, Johann-Albrechts-Höhe, 27.X.1895, leg. Conradt (MNHUB). Friese 1909b: 124.
Halictus (Thrincostoma) [!] bicometes (Enderlein): Schulz 1906: 239; Friese 1909a: 128, 150–152.
Halictus (Diagonozus) bicometes (Enderlein): Strand 1911: 141, 144.
Thrinchostoma (Diagonozus) bicometes (Enderlein): Cockerell 1908: 343; Michener 1978: 525; Medler 1980: 481; Pauly 1999: 155, 172.
Thrincostoma [!] (Diagonozus) bicometes (Enderlein): Blüthgen 1930: 495–496, 499–501, 503, 521, 536
Thrinchostoma bicometes (Enderlein): Cockerell 1910: 506; Strand 1912: 271; Cockerell 1933: 24.

Note: The type locality, Johann-Albrechtshöhe, is a former German station located in the volcanic region of NW Cameroon near Lake Barombi (4°40'N 9°24'E).