16 LEP1DOPTERA OF NORTH AMERICA. 



I 



PIERIS SCHK. 



Head rather small, short ; eyes naked, moderate ; palpi rather 

 long, somewhat compressed, a little cylindrical, clothed with rigid 

 hairs, slightly fasciculate ; the last article slender, nearly as long 

 as the preceding, forming a small acicular point ; antennas moderate, 

 the joints distinct, the club ovoid compressed. Abdomen not ro- 

 bust, a little shorter than the secondary wings. Wings moderately 

 strong, the discoidal cellule closed ; the internal edge of the 

 secondaries convex, embracing more or less the lower part of the 

 abdomen. 



Larva cylindrical, elongate, pubescent, marked with longitudinal 

 rays and small granules more or less visible. 



Chrysalis angular, terminated before by a point more or less 

 long, sometimes nearly smooth, and sometimes furnished with 

 tubercles more or less sharp, attached by the tail and a transverse 

 line. 



Pieris may easily be distinguished from the neighboring genera 

 by the antennae not being truncated, the palpi less compressed, 

 of which the last article is always nearly as long as the preceding ; 

 by the less robust body and the wings more thin. Tliey never 

 have those central silver or ferruginous spots which are always 

 present on the discoidal cell of the under side of the wings of the 

 true Colias. The prevailing color is white, more or less spotted 

 with black. 



1. P. monusta Hiibn. Samml. Exot. Boiscl. et Lee. pi. 1G. Hiibn. 

 Pap. Esot. Cram. 151. P. orseis Godt. P. cleomes Boisd. 



Male. Upper surface of primaries, white with a black border, 

 wider at the summit, serrated within. Upper surface of seconda- 

 ries, entirely white in the males. Under surface of primaries white, 

 with the border pale brown, or yellow ochre. 



Under surface of secondaries, yellow ochry, more or less pale, 

 with the border pale brown, and a saffron spot at the base. 



T7ie female has an arcuated black line on the middle of the 

 primaries, and a marginal series of black triangular spots in the 

 secondaries. 



