Genus 3. Orientilla Lelej, 1979

Diagnosis. FEMALE. This is the only Southeast Asian genus to have T1 elongate and petiolate. Additional useful features include the swollen mesonotum, the absence of a felt line on T2, the presence of a felt line on S2, and T6 lacking a defined pygidium. Other useful characters are mentioned in Lelej (1996b). MALE. See Lelej (1996b).

Diversity and Distribution. Eleven species are known. This genus is widespread in the Oriental region (Lelej 2005; Zhou et al. 2018a) and two of the species reach the Palaearctic region in China (Lelej 2002).

Remarks. Although O. vietnamica is the only species recorded from Thailand, the following species from surrounding countries are likely to be discovered there, eventually: O. chinensis (Zavattari, 1922), O. desponsa (Smith, 1855), O. krombeini Lelej, 1996, and O. sejugoides (Magretti, 1892) .