Key to species of Tycherobius (adults)

1. With a pair of (Fig. 1) or a single pdx (Fig. 25) ............................................................ 2

­ Without pdx ................................................................................................................. 10

2. Setae c1, d1 and e1 prominent, lanceolate (Fig. 9), palmate or clavate (Fig. 1); palptar­ sus with 2 setae (Fig. 3)................................................................................................. 3