Key to females of Platystigma

(females of P. buckleyi, P. humaita, P. minimum and P. quadratum unknown)

1 Hw with black or dark brown band. Species known only from Colombia, Peru and Venezuela............... jocaste group

- Hw without black or dark brown band. Species of Northern and Southeastern Brazil, Bolivia, Ecuador and Peru (Figs. 27, 35)................................................................................... quadratum group... 2

2 Posterior prothoracic lobe with lateral and median portions clearly separated by deep incision (Fig. 12).......... P. pronoti

- Posterior prothoracic lobe with lateral and median portions not clearly separated (Fig. 9)........................... 3

3 Ventral border of lateral valve of ovipositor with a row of well-developed teeth increasing in size distad (Fig. 65)..... P. sp.

- Ventral border of lateral valve of ovipositor with a row of very small denticles of equal sizes.......................... 4

4 Row of denticles originating directly from ventral border of lateral valve of ovipositor (Fig. 63)............... P. astictum

- Row of denticles originating from small, narrow, sclerotized plate on ventral border of lateral valve of ovipositor (Fig. 64).............................................................................................. P. martinezi