58 PAPILIOXID^E. 



NEPHELUS-POLYTES GROUP. 



Some of the members of this group, cJiaon, prexaspes, and noblci, 

 bear a superficial resemblance to some of the lielenus group, but 

 they are all structurally different, as they lack the clothing of hair- 

 like scales on the upperside of the fore wing so conspicuous in 

 helenus, daJcsha, &c. Two rare forms, P. sakontala, Hewitson, and 

 the still rarer P. walkeri, Janson, I have placed in this group with 

 some doubt : the fore wing in both is more produced at apex than 

 in P. polytes &c., and the shape of the club of the antennae is also 

 different. 



6 $ . Fore wing broadly triangular, dorsum at least two-thirds 

 length of costa. Hind wing elongate ; costa slightly arched ; 

 termen scalloped, produced at apex of vein 4 into a broad spatuiate 

 tail. Venation of both wings much as in the Helenus group. In 

 the two aberrant forms mentioned above, the tail at apex of 

 vein 4 of hind wing is shorter and less spatuiate. 



Key to the forms of the Nephelus-Potytes Group. 



A. Hind wing- upperside : discal markings white. 

 rt. Hind wing upperside : discal markings con- 



fined to anterior portion of wing. 

 rt'. Hind wing upperside: discal markings ex- 



tended from interspaces 3 or 4 to 7. 

 2 . Hind wing underside : no postdiscal 

 markings placed between discal and 

 subterminal markings .............. P. chaon, p. 59. 



I' 2 . Hind wing underside : a more or less 

 incomplete series of postdiscal diffuse 

 blue lunules between discal and sub- 

 terminal markings ................ P. fuscus. race pre- 



V . Hind wing upperside : discal markings ex- [.vaxpes, p. 59. 



tended from interspaces 5 to 7 only .... P. noblei, p. 60. 



b. Hind wing upperside: discal markings not 

 confined to anterior portion of wing, but 

 extended right across wing. 

 a '. Hind wing upperside : discal band of nearly 

 even width ; medial spots that compose 

 it not conspicuously longer than the 

 others ............ ". ................. P. polytes, p. 61. 



b'. Hind wing upperside : discal band conspi- 



cuously broadened in the middle ...... P. pitmani, p. 63. 



B. Hind wing upperside : discal markings bluish. 

 . Hind wing upperside : no postdiscal markings 



beyond, some diffuse scattered bluish scales. P. siikontala, p. 04. 

 b. Hind wing upperside : a conspicuous post- 

 discal transverse series of oehraceous-white 

 subquadrate spots ...................... P. walkeri, p. 64. 



