Key to the species of Polyphrix Townes

1. Propodeum with one or two pairs of somewhat oval dark spots; hind trochanter, trochantellus and femur dark brown; mesoscutum completely black ...................................................................................................................................... 2

- Propodeum uniformly orange, without dark spots (Fig. 12); hind trochanter, trochantellus and femur entirely yellowish (Fig. 7); mesoscutum not completely black (Fig. 9) .............................................................................................. 3

2. Paraocular stripe complete (Fig. 9); pronotum with strong and distinct submarginal lamellar protuberance; anterior margin of propodeum centrally distinctly concave; ovipositor slender, dorsal valve with nodus, ventral valve with nine apical teeth, apical 3–4 faint...................................................................... Polyphrix cristata Nogueira & Aguiar

- Paraocular stripe interrupted from supraclypeal area to posterior orbit; pronotum with very weak submarginal protuberance; anterior margin of propodeum weakly sinuous; ovipositor thick, dorsal valve without nodus, ventral valve with seven apical teeth .................................................................................... Polyphrix atlantica Nogueira & Aguiar

3. Pronotum and mesoscutum completely orange; metasomal tergites 2–8 black with apical white stripe; transverse furrow at base of propodeum, measured centrally, about 1.2 as wide as basal area of propodeum .................................... ............................................................................................................................................. Polyphrix varians Townes

- Pronotum and mesoscutum mostly black, with small yellow marks (Figs. 7,9); metasomal tergites 2–8 entirely orange (Figs. 7,9); transverse furrow at base of propodeum, measured centrally, about 0.7 as wide as basal area of propodeum ............................................................................................ Polyphrix stellata Tedesco & Santos, sp. nov.