31. Hind wing with nervule 8 aborted .......... Fam. 15. Syntomidae, see p. [388].
32. Hind wing with nervule 8 present (Cat. 33-51).
33. Antennae knobbed .......... Fam. 1. Castniidae, see p. [371].
34. Antennae filiform, or (rarely) dilated a little towards the tip (Cat. 35-51).
35. Fore wing with nervure 1c present (Cat. 36-43).
36. Hind wing with nervule 8 free from the base or connected with 7 by a bar (Cat. 37-42).
37. Proboscis present .......... Fam. 16. Zygaenidae, see p. [390].
38. Proboscis absent (Cat. 39-42).
39. Palpi rarely absent; ♀ winged; larvae wood-borers .......... Fam. 20. Cossidae, see p. [395].
40. Palpi absent; ♀ apterous (Cat. 41, 42).