LEPIDOPTERA PAP1LION1DAE PIERIS BECKERII. 745 







PIERIS VERNALIS, Edw. 

 Pieris Vernalis, EDW., Butterflies N. A., i. 



P. Vernalis has been found in company with Protodice and Occidentalis 

 in the mountains of Colorado ; it is widely distributed, and as yet little is 

 known of its habits. Usually it is only seen in early spring ; but my friend, 

 Mr. G. M. Dodge, late in autumn captured a single male near Princeton, 111. 



PIERIS OCCIDENTALIS, Reakirt. 



Pieris Occcidentalis, REAKIKT, Proc. Ent. Soc. Phila., 1866. 

 Pieris Callidice, var., STAUDINGER in litt. 



This species was brought by the expedition from Southern Utah ; its 

 range commences near the Rocky Mountains, and extends to the Pacific 

 Ocean. In Colorado, it is found on the plains as well as at considerable ele- 

 vations, and remains from May till August. 



t PIERIS BECKERII, Edw. 



Pieris Beclccrii, EDW., Butterflies N. A., i. 

 Pieris Chloridice, var., ZELLER. 



Primaries produced apically ; slightly excavated on costal and hind 

 margins. 



Male. Expands two inches. Upper side pure white ; the texture of the 

 secondaries slighter than that of the primaries, discovering the spots of 

 under surface ; base of wings not powdered with black, as in allied species ; 

 primaries have the apical half of hind margin bordered by small black 

 patches or clusters of scales, diminishing in size to middle of margin ; 

 anterior to these, two similar subapical patches, and a third in upper median 

 interspace ; on the arc a dense subrectangular spot (not reaching the costa) 

 with a central white streak ; secondaries immaculate. Fringes white, 

 except against the apical spots ; there black. 



Under side white ; the nervules at apex and on upper hind margin 

 bordered by black scales and suffused with greenish-yellow ; the spot on 

 interspace black as on upper side ; cellular spot enlarged, its base broadened 

 and the posterior edge excavated. 



Secondaries have all the nervures and their branches yellow ; those 



