Key to Australian genera of the family Issidae

1. Fore wings with concave costal margin (Figure 14)........................................................................... Orinda Kirkaldy

- Fore wings with convex costal margin ........................................................................................................................ 2

2. Fore wings with radius simple, bearing characteristic vein-loop proximally (Figure 15).................. Sarima Melichar

- Fore wings with radius bifurcate, branches long, without vein-loop........................................................................... 3

3. Fore wings with first radial vein sinuate near base (Figure 16) ........................................... Apsadaropteryx Kirkaldy

- Fore wings with first radial vein evenly convex near base, not sinuate (Figure 17) ................................................... 4

4. Metope rather wide (e.g. Figures 3, 4). Hind wings rudimentary or well developed, with postcubitus simple (Pcu 1), without transverse veins between postcubitus and first anal vein (A1) (Figure 19) ............ Chlamydopteryx Kirkaldy

- Metope rather elongate (Figure 18). Hind wings always well developed, with postcubitus pentafurcate (Pcu 5) and two transverse veins between postcubitus and first anal vein (A1) (Figure 22) .......................................... Tetrica Stål