Key to New World species of Paradelius de Saeger

1. Fore wing vein r present, veins 2RS and 3RS connected and not entering stigma (Fig. 118; body and antenna completely black (Fig. 118); T3 entirely costate (Fig. 120, 128)............................................................... 2

- Vein r absent, vein RS entering stigma directly (Fig. 138), body with brown parts at least on propleuron, antenna with basal segments orangish brown (Fig. 129); T3 mostly smooth, costate just basally (Fig. 134) (U.S.A.)......... P. rubra Whitfield

2. Sulcus between T1 and T2 absent (Fig. 120); propodeum entirely coarsely rugose, without distinct carinae (Fig. 117) (Costa Rica).............................................................................. P. neotropicalis sp. n.

- Sulcus between T1 and T2 distinct (Fig. 128); propodeum with smooth areas within distinct carinae (Fig. 126) (U.S.A.)........................................................................................... P. nigra Whitfield