Key to Indo-Australian species of Physaraia

1. Mesosternum strongly transverse striate; propodeum with strong carination running radially from medial side of tubercles (apophyses) (Figs 1E, 4E).............................................................................. 2

- Mesosternum not transversely striate; propodeum almost smooth medial to tubercles........... P. sumatrana (Enderlein)

2. Apical margin of metasoma and metasoma spines black; metasomal carapace widest more than 0.8 distance from base to apex (Figs 3A, 3G); Fore wing vein r approximately 0.67 × 3SR................................. P. sakaeratensis sp. nov.

- Metasoma and metasoma spines entirely yellowish or brownish (ochraceous), metasomal carapace widest not over 0.8 distance from base to apex (Figs 1G, 1H, 2G, 2H, 4G, 4H); Fore wing vein r 0.5 × 3SR.................................... 3

3. Frons with a Y-shaped carina running from anterior ocellus (Fig 4D)............................................ 4

- Frons without Y-shaped carina running from anterior ocellus................................... P. nanensis sp. nov.

4. Middle lobe of mesoscutum with distinct mid-longitudinal carina, ovipositor protruding posteriorly beyond spines by less than 0.75 spine lengths.......................................................... P. sinensis Quicke, You and Kruft

- Middle lobe of mesoscutum with only weak mid-longitudinal carina (Figs 2F, 4F), ovipositor protruding posteriorly beyond spines by more than 1.0 spine lengths (Figs 2A, 4A,)......................................................... 5

5. Propodeum postero-laterally smooth especially on inner face of apophysis, mid-longitudinal propodeal groove narrow and sharply defines (Fig 4E); pterostigma translucent brown; metasoma pale whitish anteriorly and broadly medially; medioposterior margin with one round pit (Fig 4G).................................................. P. tigeri sp. nov.

- Propodeum postero-laterally weakly scabrous with some striate running radially from apophysis; mid-longitudinal propodeal groove weak, not sharply defines anteriorly (Fig 2F), pterostigma black; metasoma largely brown-yellow with white marking sublaterally on anterior two thirds; medioposterior margin areolate rugose (Fig 2G).................. P. panhai sp. nov.