Key to the species of Tasmantrix Gibbs, gen. nov.

Wing maculation alone (Fig. 1) cannot satisfactorily distinguish between all species of Tasmantrix, hence a combination of forewing patterns, antennal morphology and male genitalic characters are used here.

1. Forewing with a white transverse fascia at mid-length continuous from costa to termen (the ‘ calliplaca - type’ macu- lation) (Fig. 1 A) ............................................................................................................................................................ 3

- Forewing with white fascia at mid-length but not forming a continuous costa to termen band ................................. 2

2. Forewing transverse fascia at mid-length represented by two independent white fasciae, one on costa, one on termen (Fig. 1 F); male segment 9 sclerite a complete ring ......................................................... tasmaniensis Gibbs, sp. nov.

- Forewing with an elongate ‘J’-shaped fascia extending from base to termen at mid-length (Fig. 1 C); male sclerite 9 incomplete dorsally .................................................................................................................. lunaris Gibbs, sp. nov.

3. Male valvae forked with upper and lower arms .......................................................................................................... 4

- Male valvae simple ....................................................................................................................................................... 5

4. Male valvae fused together in ventral mid-line, forming a rigid semicircular clasper; lower valve fork apex bearing 6-8 specialised setae with recurved tips; a small lunular S8 remnant present ......... calliplaca (Meyrick), comb. nov.

- Male upper and lower valve arms separated by wide semicircular emargination; both arms bearing a dense array of specialised recurved setae with brush tips; lacking S8 remnant .................................................. thula Gibbs, sp. nov.

5. Male tergum 10 divided into two lobes..................................................................................... fragilis Gibbs, sp. nov.

- Male tergum 10 simple, hood-like ............................................................................................................................... 6

6. Male valvae simple, bearing a dense area of long curved setae (‘retro-setae’) with brush borders on their inner sur- face ......................................................................................................................................... phalaros Gibbs, sp. nov.

- Male valvae with broad club-like apices, bearing a dense area of coarse ‘retro-setae’ on inner surface ....................... ............................................................................................................................................. nigrocornis Gibbs, sp. nov.