7G PIERIDiE. 



Genus XVI. TERIAS Swainson. 



Swainson, Zool. Ill 1st series, t. 22. (1820). 

 Boisd. S P . Gen. i. 651. (1836). 



Xanthidia Boisd. fy Leconte, Icon. Lip. Am. Sept. 48. (1828). 



Pontia Fab. 



Pieeis Latr., God'. 



Colias Latr., God'. 



Leptosia, Eubema, Abaeis, Htibn. 



Head small, clothed with short hairs. 

 Eyes round, rather prominent. 

 Labial Palpi rather short, projecting but little beyond the forehead ; densely clothed with short 



round scales at the sides, with longer ones in front. First joint slightly curved, broadest at the 



base, slightly compressed at the sides ; second joint scarcely one third the length of the first, 



oval ; third joint minute, oval, clothed with very small scales, almost hidden beneath the scales 



of the second joint. 

 Antennce rather short, moderately stout, gradually incrassated beyond the middle ; the apex 



rounded. 

 Thoeax slender, hairy. 



Anterior Wings subtriangular, generally rounded at the apex, rarely acuminate ; the costa much 



curved at the shoulder ; the inner margin slightly emarginate. Costal nervure rather stout. 



Subcostal nervure four-branched : the first nervule thrown off about the middle of the cell ; the 



second just before the end of the cell ; the third nearer to the apex than to the end of the cell. 



Upper disco-cellular nevvule wanting ; middle disco-cellular rather shorter than the lower. 



Upper discoidal nervule united for a greater or less distance to the median nervule. Internal 



nervule wanting. 

 Posterior Wings mostly broadly obovate, or rounded, sometimes angular. Precostal nervule 



nearly atrophied. Discoidal nervule sometimes appearing to be a third submedian, at others 



thrown off exactly where the subcostal nervure branches, sometimes above that point. 



Disco cellular nervule much curved. Abdominal fold broad. 

 Feet slender. Tarsi long, very spiny. Claws deeply bifid ; the outer tooth mostly more slender 



and acute than the inner. Paronychia as long as, or longer than, the claws ; sometimes broad, 



nearly covering the claw, sometimes narrow, lanceolate ; fringed with delicate hairs. Pulvillus 



jointed, very broad at the end ; about equal in length to the claws. 



