1	Propodeum in profile with the transition from dorsum to declivity sharply defined, the declivity concave and the angle with a raised apex (Fig. 5a)	T. wilsoni Sharaf & Aldawood
–	Propodeum in profile with the transition from dorsum to declivity has a rounded angle (Fig. 5b)	2
2	Larger species, TL more than 2.0 mm; anterior clypeal margin with a deep median notch (Fig. 5c); colour darker, uniformly blackish-brown or black	T. simrothi Krausse
–	Smaller species, TL less than 2.0 mm; anterior clypeal margin with only a shallow median concavity (Fig. 5d); head and mesosoma dark yellowish-brown, gaster yellow	T. melanocephalum (Fabricius)