72 PIEKID^E. 



Genus XV. CO LIAS Boisd. 



Boisd. Sp. Gen. i. 633. (1836). 



Collas Fab., Latr., Ochs., God'., Steph. fyc. 

 Pieris Schranck, Latr. 

 Ganoris Dolman. 

 Zerene, Colotis, Hiibn. 



Head moderately broad, clothed with rather long hairs. 

 Eyes oval, prominent. 

 Labial Palpi longer than the head ; clothed with scales, and in front with oppressed hairs. First 



joint curved ; second cylindric, about equal in length to the first ; third joint minute. 

 Antennas short, rather stout, gradually thickening to the apex, which is truncate. 

 Thorax stout ; clothed, in front densely, with fine hair. 



Anterior Wings subtriangular ; the apex sometimes, though rarely, acuminate, or almost falcate ; 



the costa sometimes slightly sinuate. Costal nervure very stout. Subcostal four-branched : its 



first nervule thrown off about the middle of the cell ; the second, at, or near to, the end of the cell ; 



the third, much nearer to the apex than to the end of the cell. First discoidal nervule united to 



the subcostal for a considerable distance beyond the cell. Lower disco-cellular nervule about 



twice the length of the middle disco-cellular. 

 Posterior Wings obovate, or subtriangular, with the angles rounded. Discoidal nervure appearing 



to be a third subcostal nervule. 

 Legs moderately stout. Tarsi rather long, very spiny. Claws but little curved, deeply bifid, 



without paronychia or pulvilli. 

 Abdomen of moderate size, not equal in length to the inner margin of the posterior wings. 



Larva subcylindric, but little smaller at the extremities, slightly pubescent. 

 Pupa not arched, gibbous ; the head abruptly pointed, the abdomen tapering gradually to a 

 point, the back keeled. 



Colias is distinguished from the other genera of this family, except Nathalis, by the absence of paronychia. From 

 that genus it is at once known by the totally different structure of its palpi and antenna?. 



The prevalent colour of all the species is yellow or orange, sometimes verging to white, sometimes, as in the most 

 northern species, to a greenish hue. The bright orange species generally have a beautiful violet, or pale purple, gloss 

 in certain lights. This is particularly the case in Colias Lesbia. This species, a native of the extreme south of South 

 America, is only known to me by the specimens in the Banksian Cabinet, perhaps the only ones in any collection 



