Key to genera and species of world Pycnostigminae

1.

Notaulices complete from anterior margin of mesoscutum (at junction with pronotum) to posterior margin (at junction with scutellum); parascutal impression present; female with more than 10 flagellomeres ...2

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Notaulices incomplete, not reaching the pronotum, but present midway across mesoscutum and continuing to junction with scutellum; parascutal impression absent; female with 10 flagellomeres ...Tylosema 7 (One species in Algeria, two species in South Africa).

2.

Scutellum in lateral view evenly rounded ...Pycnostigmus 3 (Five species in South Africa).

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Scutellum in lateral view with a distinct angle, resulting in a postero-dorsal flattened area ...Trjapitziniola 9 (One species from Armenia; one species from United Arab Emirates).

3.

Head, mesosoma and coxae metallic green-gold ...Pycnostigmus mastersonae

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Head, mesosoma and coxae non-metallic ...4

4.

Pronotum foveolate and rugulose ...Pycnostigmus rostratus

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Pronotum weakly to strongly carinate, not foveolate ...5

5.

Disk of scutellum smooth and polished in center ... Pycnostigmus fossilensis

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Disk of scutellum partially to entirely rugose ...6

6.

Mesopleuron with numerous strigae; pronotum strongly carinate; disk of scutellum variously carinate posteriorly ...Pycnostigmus hoerikwaggoensis

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Mesopleuron smooth with few strigae; pronotum smooth with a few weak carinae; disk of scutellum with a single dominant carina present around the perimeter of the disk ...Pycnostigmus incognito

7.

Disk of scutellum entirely smooth; posterior margin of scutellum lacking a distinct carina ...Tylosema dayae

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Disk of scutellum smooth in center, rugose on lateral and posterior edges; posterior margin of disk of scutellum with a distinct carina ...8

8.

Lateral aspect of pronotum smooth; mesoscutum smooth and lacking setae ...Tylosema ronquisti

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Lateral aspect of pronotum rugulose/areolate; mesoscutum distinctly shagreen with scattered setae ...Tylosema nigerrimum

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9.

Mesopleuron striate anteriorly, gradually becoming smooth posteriorly (arrow 1); ventral portion of metapleuron crenulate (arrow 2); ventro-posterior aspects of propodeum glabrous (arrow 3) ...Trjapitziniola popovi

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Mesopleuron entirely striate (arrow 1); ventral portion of metapleuron smooth (arrow 2); ventro-posterior aspects of propodeum setose (arrow 3) ...Trjapitziniola vanharteni