INJURIOUS TO CABBAGE AND RELATED CROPS 7 

 The Potherb Butterfly 



Pontia oleracea Harris 



Before the introduction of the imported cabbage butterfly, 

 this species was abundant in the northern United States and 

 Canada east of the Rocky jNIoun- 

 tains but soon became rare 

 throughout the greater part of its 

 range. The caterpillar of this 

 species closely resembles that of 

 the imported form but lacks the 

 yellowish dorsal stripe. The 

 butterfly has the upper surface 

 of both pairs of wings and the 



and 

 under surface of the front wings 



Fig. G. 



The potherb butter- 

 fly (XI). 



nearly pure white. The hind wings are usually marked on 

 the underside with gray stripes extending along the veins. 

 Rarely the under surface is pure white (Fig. 6). 



References 



Riley, U. S. Ent. Rept. for 1883, pp. 115-117. 

 Scudder, Butterflies of Eastern U. S., 2, pp. 1191-1204. 



1889. 



The Southern Cabbage Butterfly 

 Pontia protodice Boisduval and Le Conte 



This cabbage-feeding caterpillar is widely distributed through- 

 out the United States but is more common southward, where it 

 often causes serious injury to cruciferous crops. As in the 

 case of the potherb butterfly, this species has decreased in 

 numbers and importance since the introduction of its European 

 relative. The butterfly is known as the checkered white. The 

 ground color of the wings is white in the male and dirty white in 



