Females
1. Occipital carina incomplete ...2

- Occipital carina complete ...5

2. Forewing with one dark transverse band; hind wing hyaline ...3

- Forewing and hind wing hyaline, without dark transverse bands ...4

3. Head with OOL more than twice as long as POL; mesoscutum yellow-testaceous, with anterior margin black ...Thaumatodryinus dentatus Benoit

- Head with OOL less than twice as long as POL; mesoscutum black ...Thaumatodryinus tuukkaraski Olmi, Copeland & Guglielmino

4. Mesosoma partly black or brown; head with OPL usually longer than OL (rarely as long as OL) ...Thaumatodryinus dentatus Benoit

- Mesosoma totally testaceous-reddish; head with OPL as long as, or shorter than OL ...Thaumatodryinus migratorius Benoit

5. Notauli incomplete, reaching approximately 0.5 × length of mesoscutum ...Thaumatodryinus afer Olmi

- Notauli complete or almost complete ...6

6. Head mostly black; mesothorax, metathorax and metapectal-propodeal disc black ...Thaumatodryinus mirabilis Olmi

- Head, mesothorax, metathorax and metapectal-propodeal disc totally or mostly testaceous-reddish or testaceous ...7

7. Hind wing with one brown distal band ...Thaumatodryinus infuscatus Olmi

- Hind wing hyaline, without dark transverse band ...Thaumatodryinus comptoni Olmi

Males

1. Notauli incomplete ...Thaumatodryinus overholti Olmi, Copeland & Guglielmino

- Notauli complete, posteriorly separated ...2

2. Head and mesosoma totally testaceous; inner side of paramere with mosaic sculpture ...Thaumatodryinus comptoni Olmi

- Head and mesosoma black, or testaceous and with wide or small brown regions; inner side of paramere without mosaic sculpture ...3

3. Minimum distance between notauli shorter than breadth of each lateral region of mesoscutum measured at posterior margin of mesoscutum ...Thaumatodryinus merinus Olmi

- Minimum distance between notauli longer than breadth of each lateral region of mesoscutum measured at posterior margin of mesoscutum ...Thaumatodryinus sokokensis Olmi