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Genus IPHIAS, Boisd. 



The two conspicuous insects which at present com- 

 pose this genus, were wont to be referred either to 

 Pieris or Colias. They have certainly a close rela- 

 tion to both, as well as to Anthocharis, but the .fol- 

 lowing characters seem to warrant their separation ; 

 antenna? long, gradually increasing into a club which 

 is truncated at the extremity ; palpi contiguous and 

 compressed, thickly covered with scales cut of equal 

 length, the terminal joint minute and truncated; 

 head clothed with rather long projecting scaly hairs ; 

 thorax robust ; abdomen much shorter than the 

 inferior wings ; wings very large and strong, the 

 discoidal cell closed. The caterpillar is attenuated 

 at both extremities and shagreened on the surface, 

 the chrysalis much arched and fusiform at both 

 ends. 



