Key to species of Casuarinicola

1. Fore wing of female with dark markings; fore wing of male (usually) clear [Australia] ............................................ 2

- Fore wing of both male and female clear, without dark markings (Figs 34-35) [New Caledonia, host plant: C. collina] ....................................................................................................... Casuarinicola novacaledonica Taylor sp. nov.

2. Apex of fore wing rounded (Figs 5–6) ......................................................................................................................... 3

- Apex of fore wing subangular (Figs 21–22) [host plants: C. cristata, C. pauper] ........................................................ ................................................................................................................. Casuarinicola mucronalatus Taylor sp. nov.

3. Genal processes short (0.3–0.5 times length of vertex) (Figs 7, 18), fore wing of female with dark markings in incomplete terminal bands ........................................................................................................................................... 4

- Genal processes very short (about 0.2 times length of vertex) (Fig. 43); fore wing of female with dark densely maculate markings in apical half, less dense in proximal half (Fig. 41), fore wing of male clear [host plant: C. cristata]. ................................................................................................................. Casuarinicola warrigalensis Taylor sp. nov.

4. Fore wing of female with dark markings in a single incomplete broad terminal band (Fig. 16), fore wing of male usually with dark markings (Fig. 17); [host plant: C. cunninghamiana]........................................................................ ............................................................................................................... Casuarinicola nigrimaculatus Taylor sp. nov.

- Fore wing of female with dark markings in three incomplete terminal bands (Fig. 5), fore wing of male clear (Fig. 6) [from various Casuarina spp.] ........................................................................ Casuarinicola australis Taylor sp. nov.