HETEROCERA MOTHS 369 



B. Fore wing with nervule 5 coming from lower angle of cell or nearer 4 



than 6 [see figures 161 and 162, pp. 318, 319] (Categories 19-58). 

 19. Hind wing with more than 8 nervules (Cat. 20, 21). 



20. Proboscis absent, no mandibles nor ligula ; size not very small 



Fam. 23. Hepialidae, see p. 396. 



2 1. Mandibles, long palpi and ligula present ; size very small 



Fam. 47. Micropterygidae, see p. 435. 

 22. Hind wing with not more than 8 nervules (Cat. 23-58). 



23. Hind wing with nervule 8 remote from 7 after origin of 



nervules 6 and 7 (Cat. 24-51). 

 24. Frenulum absent (Cat. 25-29). 



25. Hind wing with one internal nervure ; nervule 8 with 

 a precostal spur, Fam. 31. Pterothysanidae, see p. 406. 



26. Hind wing with two internal nervures (Cat. 27 and 28). 



27. Hind wing with a bar between nervules 7 and 8 

 near the base ; nervure la directed to middle of inner 

 margin . Fam. 30. Endromidae, see p. 406. 



28. Hind wing with no bar between nervules 7 and 8 ; 

 nervure la directed to anal angle 



Fam. 29. Lasiocampidae, see p. 405. 

 29. Hind wing with three internal nervures 



Fam. 21. Arbelidae, see p. 396. 

 30. Frenulum present (Cat. 31-51). 



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 Ic 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). 



41. 9 rarely with legs; 9 an( l 

 larvae case-dwellers 



Fam. 19. Psychidae, see p. 392. 



42. ^ and larvae free l 



Fam. 1 8. Heterogynidae, see p. 392. 



1 This is a mistake of Sir George Hampson's. It has long been known that the 

 female of Heterogynis does not leave the cocoon (for references see p. 392) ; the 

 larvae, however, do not live in cases, as those of Psychidae do. 



VOL. VI 2 B 



