10 



INTRODUCTION. 



B. Fore wing with vein 5 from lower angle 

 of cell or nearer 4 than 6. 



a. Hind wing with more than 8 veins. 



a'. Proboscis absent; no mandibles nor 



ligula 15. Hepialidae. 



b'. Mandibles, free palps, and ligula 



present * Micropterygidae. 



b. Hind wing with not more than 8 veins. 

 a'. Hind wing Avith vein 8 remote from 



7 after origin of veins 6 and 7. 

 a 2 . Frenulum absent. 



a 3 . Hind wing with one internal 

 vein ; vein 8 with a precostal 



spur 21. Pterotliysanidae. 



b 3 . Hind wing with two internal 

 veins. 

 a*. Hind wing with a bar be- 

 tween veins 7 and 8 near the 

 base ; vein 1 a to middle of 



inner margin * Endromiidae. 



b*. Hind wing with no bar be- 

 tween veins 7 and 8 ; vein 



1 a to anal angle 20. Lasiocampidae. 



c 3 . Hind wing with three internal 



veins 14. Arbelidae. 



A 2 . Frenulum present. 



a 3 . Hind wing with vein 8 aborted. 10. Syntomidae. 

 b 3 . Hind wing with vein 8 present. 



a 4 . Antennae knobbed * Castniidae. 



b x . Antennae filiform, or rarely 

 dilated. 

 a 5 . Fore wing with vein 1 c 

 present. 

 a 6 . Hind wing with vein 8 

 free from the base or 

 connected with 7 by a 

 bar. 

 a 7 . Proboscis present . . 11. Zygaenidae J. 

 b 7 . Proboscis absent. 

 a 8 . Palpi rarely absent ; 

 § winged; larvae 

 wood-borers .... 13. Cossidae. 

 J 8 . Palpi absent ; 5 a P~ 

 terous. 

 a 9 . § rarely with 

 legs ; 5 and 

 larvse case- 

 dwellers 12. Psychidae. 



b 9 . 2 ar >d larvse free. * Heterogynidae. 

 b e . Hind wing with vein 8 

 anastomosing shortly 

 with 7 19. Limacodidae. 





* Not known to occur in India. 



t In tbe degraded subfamily Thaudina the mouth-parts are absent, and in 

 Himantcpterus there is no frenulum ; in Anomceotes vein 1 c of the fore wing is 

 absent. 



