INSECTS INJURIOUS TO GARDEN TRUCK 481 



abundant in gardens, but they did not bore into the head of 

 the cabbage as the invader does, and so were not such serious 

 pests. Because it breeds more prolifically and feeds earlier 

 and later in the season the imported species has almost or quite 

 driven the others from the garden. The familiar white cab- 

 bage-butterflies, with their black-tipped fore wings, appear 

 early in the spring and lay their eggs on almost any available 



FIG. 228. The imported cabbage-butterfly, Pontia rapes; male above, 

 female below. (Natural size.) 



food. In the south the adults may be found at all times of the 

 year. The female has two black spots in the disc of each fore 

 wing, the male only one. Both sexes have a spot on the anter- 

 ior margin of the hind wing. The larvae are velvety green 

 with a faint yellowish line above and yellowish spots on the 

 sides. The pupae, or chrysalids, are usually found on the 

 underside of leaves, on rocks, fences or other objects. The insect 

 usually passes the winter in the field in the pupal stage. 



31 



