60 PIERIDiE. 



Genus X. THESTIAS Boisd. 

 Boisd. Sp. Gin. i. 590. (1836). 



Ixias Hiibn. Verz. bek. Schmett. 95. (1816).* 

 Pieeis Latr., God'. 

 Pontia Horsjield. 



Head rather broad, clothed with hairs and scales. 



Eyes round, prominent. 



Labial Palpi projecting slightly beyond the forehead, hairy. Basal joint elongate, cylindrical, very 

 much curved, truncate at the apex ; second joint about one third the length of the first, elongate 

 obovate, truncate at the base ; third joint oval, very small, about one fourth the length, and one 

 third the breadth, of the second. 



Antenna? of moderate length, terminating gradually in a compressed club. 

 Thorax rather stout, clothed with rather long, delicate hairs. 



Anterior Wings subtriangular, the costa slightly rounded. Subcostal nervure four-branched. 

 First subcostal nervule thrown off considerably, beyond the middle of the cell ; second much 

 nearer to the end of the cell than to the first ; third at two thirds the distance between the 

 second and the apex. First discoidal nervule united for a considerable distance to the subcostal 

 nervure. Middle disco-cellular nervule about half as long as the lower. 



Posterior Wings somewhat obovate, the outer margin but little rounded, abdominal channel very 

 distinct ; cell broad. Discoidal nervure appearing to be a third median nervule. 



Legs slender. Tarsi very spiny. Paronychia broad, nearly as long as the claws. Pulvillus 

 jointed, quite as long as the claws, the last joint broad. 

 ABDOitEN moderately stout, not so long as the abdominal margin of the wings. 



Larva and Pupa resembling those of Anthocharis. 



Thestias differs from Anthocharis in the form of its palpi, in its more gradually clavate antennae, its more robust 

 win"-3, and its broader paronychia. It is closely allied, however, to the last section of the latter genus, which it much 

 resembles in the distribution of the colours. 



The Larva and Pupa differ but little from those of Anthocharis ; but, I believe, no description of them has yet been 

 published. My only knowledge of them is from a paper read to the Entomological Society, but not yet published. 



The genus is peculiar to the South of Asia, and its islands. 



» This name being so near that of Ixia, employed in botany, cannot be retainei 



