Key to species of Problematode:

1. Pronotum with keel-like dorsal process.................................................... P. sakakibarai Gaiani

1’. Pronotum lacking dorsal process (Fig. 6A, 6C).............................................................. 2

2(1’). Dorsal region of pronotum with two bare, glabrous projections at each side of medial carina. Forewing with membrane punctate and sclerotized at basal half; reticulate venation at apical half with dense supranumerary crossveins; pro- and mesofemora each with medial spine on ventral margin..................................................... P. inerme Gaiani

2’. Dorsal region of pronotum lacking projections at each side of medial carina (Fig. 6 D–E). Forewing with membrane punctuated and sclerotized at basal third (until before division of M and Cu); reticulate venation at apical half with supranumerary crossveins incomplete, leaving large membranous areas (Fig. 6A, 6C); pro- and mesofemora simple, without spine (Fig. 6A, 6 D–E)..................................................................................... P. robertoi sp. nov.