3. Fore wing with nervule 6 and 7 stalked .......... Fam. 39. Uraniidae, see p. [419].
4. Fore wing with nervules 6 and 7 not stalked .......... Fam. 5. Ceratocampidae, see p. [375].
5. Hind wing with nervule 8 nearly touching 7 beyond end of cell .......... Fam. 4. Brahmaeidae, see p. [374].
6. Proboscis absent, legs without spurs (Cat. 7 and 8).
7. Hind wing with one internal nervure .......... Fam. 3. Saturniidae, see p. [372].
8. Hind wing with two or three internal nervures .......... Fam. 6. Bombycidae, see p. [375].
III. Frenulum present (Cat. 9-18).
9. Antennae fusiform [spindle-shaped] .......... Fam. 9. Sphingidae, see p. [380].
10. Antennae not fusiform (Cat. 11-18).
11. Proboscis absent .......... Fam. 7. Eupterotidae, see p. [376].