PAPILIO. 11 



OrnitJioptera, Boisduval, which Eothschild has as a distinct genus, 

 under Papilio as an additional group. A division of the Indian 

 " swallow-tails " into groups, founded on the structure of the 

 larva and pupa, was also proposed by Messrs. Davidson & Aitken 

 (Jour. Bomb. N. H. Soc. v, 1890, p. 361), but their paper deals 

 only with the very limited number of the forms found in the 

 Bombay Presidency. 



There is no hard and fast rule as to the value of characters 

 that may serve for generic distinction : it varies in each order of 

 insects. The subdivision of the large and unwieldy genus Papilio 

 will be a convenience. This has already been carried out by 

 Mr. Moore in the ' Lepidoptera Indica ' and also by other writers, 

 but, as I understand, Mr. Eothschild and Dr. Jordan are now 

 engaged on a fresh revision of the genus founded on an exami- 

 nation of the forms of these insects from all parts of the world, 

 I prefer to await the result of their studies, and in the meantime 

 have adopted Mr. Eothschild's tentative arrangement. 



Key to the Groups of Papilio. 



A. Fore wing : vein 11 not anastomosed with 

 vein 12. 



a. Males without anal valves to abdomen . . HECTOR group, p. 18. 



b. Males with anal valves to abdomen. 



a'. Anal valves open on upperside COON group, p. 23. 



b'. Anal valves not open on upperside, 



normal. 



(C-. Wings large, of comparatively great 

 expanse ; abdomen remarkably heavy 

 and massive ; anal valves very large, 



prominent OBXITHOPTEKA group, 



IP. Wings generally of less expanse ; [p. 13. 



abdomen not particularly heavy or 

 massive; anal valves of moderate 

 size. 



3 . No conspicuous blue or green 

 colouring or markings on upper- 

 side of wings. 



a 4 . Hind wing : upper and middle 

 discocellulars subequal, or 

 upper shorter than middle. 

 '. Both sexes : hind wings with- 

 out tails Nox group, p. 25. 



b\ Both sexes : hind wings with 



tails LATKKILLEI group, 



b 1 . Hind wing : upper discocellular [p. 27 



longer than middle. 

 a\ Fore wins: not acutely pointed 



at apex, not falcate. 

 a 1 : Upperside of fore wing in 

 (5 densely clothed with 

 short hairs on its terminal 

 half HELENUS group, p. 41. 



