Key to species of Plutofoenus (females)

1. Ovipositor sheath 1.5X longer than metasoma (Fig. 3d); head usually uniformly red brown (Fig. 11 e)....................... ......................................................................................................................................... P. paraguayensis (Schrottky)

- Ovipositor sheath at least 2.0X longer than metasoma (Figs. 3b–c); head usually black to dark brown (Figs. 11 a, 11c) ...................................................................................................................................................................................... 2

2. Ovipositor sheath approximately 3.0X longer than metasoma (Fig. 3b); head as wide as long (Fig. 11 a); pronotum with deep rugae (Fig. 13 c) .................................................................................................... P. chaeturus (Schletterer)

- Ovipositor sheath approximately 2.2X longer than metasoma (Fig. 3c); head wider than long (Fig.11 c); pronotum with shallow rugae (Fig. 13 d) .......................................................................................................... P. ed wa rd si Turner