Group flavus

Definition. In imago and subimago of both sexes, thorax light, with interrupted blackish stripe along pleura; fore wing maculate, costal field with many cross veins bordered by brown, pterostigmatic cross veins anastomozed; femora twice banded; abdominal terga II–VI of male with oblique lateral streaks, without midway spots (Figs 365–367, 398–401). Hind wing without dark brown coloration of costal brace (Figs 376–408) (in contrast to all examined species).

Composition. Th. flavus sp. n. and Th. spangleri Traver & Edmunds 1967 .