TERIAS. 33 



delicate, rather wide, discoidal cellules closed ; primaries having 

 the costal edge strongly arcuate towards the base ; the seconda- 

 ries embracing the abdomen below. 



This genus has been sometimes confounded with Pieris and 

 again with Colias. It differs from the first in having the palpi 

 furnished with shorter and more closely set hairs, and the last 

 article very short. It differs from the second in the delicate 

 texture, the arcuate antennas, the laterally compressed club, and 

 the wings destitute of the discoidal silvery spots below. 



The thin and delicate wings are usually yellow, with the summit 

 of the primaries deep black, contrasting agreeably with the ground 

 color. 



1. T. nicippe Fab. Ent. Syst. Ill, 1, 208. Figured in Cram. Pap. pi. 

 210. Herbst. Pap. pi. 107. Boisd. et Lee. 55, pi. 20. Say's Anier. 

 Ent. pi. 30. Lucas' Hist. Nat. des Pap. Exot. pi. 38. 



Upper side lively yellow orange, with a wide black common 

 border, sinuate within, wider at the summit of the primaries, where 

 it is surmounted on the upper edge with three or four small yellow 

 streaks. The primaries also have on the extremity of the discoidal 

 cellule a small black crescent, and the upper edge towards the base 

 is densely sprinkled with black. 



Under side of primaries paler. 



Under side of secondaries yellow, with brown atoms ; a small 

 discoidal black dot ; a brownish spot on the middle of the costal 

 edge ; then a transverse band, undulate, more or less brownish. 



Female differs from the male in being paler and often of a yellow 

 color ; the black border of the primaries suddenly ceases a little 

 before the internal angle, and that on the secondaries is partly 

 effaced towards the anal angle. 



Larva, which feeds on Cassia and Trifolium, is pale green, with 

 a dorsal ray more obscure, and a lateral white band, marked before 

 with five yellow points. 



Chrysalis green, a little arcuate, sprinkled with ferruginous spots. 



United States.— Expands a little over two inches. 



Boisd, 



