Key to species of Tamdaona Belobobylskij

1 Basal area of second metasomal tergite triangular and medially 0.20 × as long as wide anteriorly, mainly punctate and distinctly protruding medio-posteriorly (Fig. 87); propodeum steep posteriorly (Fig. 83); second tergite less transverse and 1.5 × as long as third tergite (Fig. 87); second metasomal suture narrow medially (Fig. 87); notauli narrow anteriorly (Fig. 85); [setose part of ovipositor sheath 0.15–0.20 × as long as fore wing]................................. T. janus Belokobylskij, 1994

- Basal area of second metasomal tergite transverse, narrow triangular or circular and medially 0.10–0.15 × as long as wide anteriorly, entirely sculptured and hardly or not protruding medio-posteriorly (Figs 71, 93, 104); propodeum gradually lowered posteriorly (Figs 65, 89, 100); second tergite more transverse and 1.2–1.3 × as long as third tergite (Figs 71, 93, 104); second metasomal suture wider medially (Figs 71, 93, 104); notauli wider anteriorly (Figs 70, 92, 103)....................... 2

2 Vein 3-SR of fore wing about twice as long as vein r (Fig. 101); mesosoma ventrally and posteriorly black (Fig. 102); fourth and fifth metasomal tergites distinctly sculptured (Fig. 104); vein 1-R1 slightly longer than pterostigma (Fig. 101); frons with medio-longitudinal depression (Fig. 108); [setose part of ovipositor sheath approx. 0.23 × as long as fore wing]................................................................................ T. sculpturata van Achterberg, sp. n.

- Vein 3-SR of fore wing 1.0–1.2 × as long as vein r (Figs 67, 90); mesosoma ventrally and more or less also posteriorly yellowish brown (Figs 69, 91); fourth and fifth tergites largely smooth (Figs 71, 93) or superficially sculptured; vein 1-R1 1.1–1.5 × longer than pterostigma (Figs 67, 90); frons without medio-longitudinal depression (Figs 74, 97)...................... 3

3 Setose part of ovipositor sheath 0.15–0.20 × as long as fore wing (Fig. 89); second submarginal cell of fore wing hardly narrowed anteriorly (Fig. 90); basal area of second tergite transversely striate (Fig. 93); legs brownish yellow (Fig. 99); rim of mesoscutum brownish near tegulae (Fig. 92)......................................... T. maga Belokobylskij, 1994

- Setose part of ovipositor sheath 0.33–0.38 × as long as fore wing (Fig. 65); second submarginal cell of fore wing distinctly narrowed anteriorly (Fig. 67); basal area of second tergite finely reticulate (Fig. 71); legs pale yellowish (Fig. 72); rim of mesoscutum dark brown near tegulae (Fig. 70).................................... T. brevizona van Achterberg, sp. n.