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Genus IPHIAS, Boisd.
The two conspicuous insects which at present compose this genus, were wont to be referred either to Pieris or Colias. They have certainly a close relation to both, as well as to Anthocharis, but the following characters seem to warrant their separation; antennæ 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.
