Key to larvae of Crassabwa

1. In last larval instar, tergalius I in proximal half with anal portion usually bent ventrally (Figs 23, 84); other tergalii II–VII without such overturned portion ( Crassabwa)...................................................................2

- In last larval instar, tergalii not as above............................................................ other taxa.

2. In last instar larva, cuticle of fore protopteron with dark lines corresponding to convex longitudinal veins only (Fig. 4). Mola of left mandible with even row of denticles (Fig. 8). First tergalius relatively narrow (in spread condition) (Fig. 24).................................................................................................. Crassabwa flava

- In last instar larva, cuticle of fore protopteron with dark lines corresponding to convex, concave and cross veins (Fig. 62). Mola of left mandible with tubercles bearing denticles (Fig. 81). First tergalius relatively wide (in spread condition) (Fig. 8 5)................................................................................................... 3

3. Claw relatively short, with portion from distal denticle to apex shorter than portion from distal denticle to base (Figs 66, 95)................................................................................ Crassabwa ludmilae sp. n.

- Claw relatively long, with portion from distal denticle to apex longer than portion from distal denticle to base (Fig. 126).................................................................................... Crassabwa ameliae sp. n.