KEY TO THE GROUPS— BUTTERFLY. 41 



r\ Vein 2^ of fore wings forked only at the 

 tip ; middle tibi^ at least as long as 

 the femora. (Tribe Whites.) 



g\ Vein V of fore wings arising at or beyond 

 the tip of the cell ; fore tibiae very 

 much shorter than middle tibiae. 



41. Pontia. 

 g' Vein 2^ of fore wings arising distinctly 

 before the tip of the cell; fore and 

 middle tibiss of equal length. 



42. Pieris. 

 I)^ Antennae more or less arched; vein 3 of fore 



wings with four branches; each 

 claw simple. 



(Subfamily Swallow-Tails.) 

 e'. Club of antennae nearly straight, almost im- 

 perceptibly upcurved ; i\]) of abdo- 

 men almost reaching emargination 



of hind wings 43. Laertias. 



e'". Club of antennae curved strongly upward 

 throughout; tip of abdomen not 

 nearly reaching emargination of 

 hind wings, 

 i\ Club of antennae relatively short; hind 

 wings, exclusive of tails, nearly 

 twice as long as broad. 



44. Ipliidides. 



f\ Club of antennae relatively long ; hind 



wings, exclusive of tails, hardly more 



than half as long again as broad. 



g'. Fore tibiae decidedly shorter than the 



tarsi; tails of hind wings broadened 



at the end. 



h\ Vein 4 of hind wings nearly straight; 



vein 2^ of fore wings arising at about 



