1. Metasomal tergite 1 distinctly dorso-medially compressed,
tergites 4-8 white where weakly sclerotized (A); keels distinctly
raised on mesoscutal lobes (B); notauli abbreviated, not reaching
the scutellum ...Tetractenion
acaule
- Metasomal tergite 1 with dorso-medial compression weak or absent,
tergites 4-8 strongly sclerotized (a); keels only slightly raised on
mesoscutal lobes (b); notauli present, posteriorly meeting before
reaching the scutellum (b) ...2
2. Metasomal tergite 1 stout, about as long as wide in dorsal view
(A); pits on the mesopleuron and propodeum are large and deep (B) …Tetractenion
ibayaensis
- Metasomal tergite 1 elongate, about twice as long as wide in
dorsal view (a); pits on the mesopleuron and propodeum shallow (b)
...3
3. Hind tarsal claw simple (A); wings with dense microtrichia,
venation dark (B) ...Tetractenion
luteum
- Hind tarsal claw pectinate (a); wings usually with sparser
microtrichia, venation usually yellowish-brown (b) ...4
4.ML 0.6 (A); head yellow, congruent with yellow body (B) ...Tetractenion
pseudolutea
- ML 0.7-0.9 (a); head dark purplish-brown or reddish-brown, contrasting with yellow
body (b) ...5
5. Pronotal collar with strong carina present (A); head
reddish-brown and less robust, face weakly three lobed (B) ...Tetractenion
rosei
-
Pronotal collar weakly wrinkled (a); head dark purplish-brown and
more robust, face strongly three-lobed ...Tetractenion
pascali
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