The Bulletin. 



31 



Mississippi valley. The worms feed mainly on the outer leaves. The 

 general appearance of the chrysalis (pupa) is more or less similar to 

 that of the imported cabbage worm. 



Fig. 14. — Adult butterflies of the Native Cabbage Worm. 

 Female above. Male below. Natural size. 

 (Photo by Z. P. Metcalf.) 



The adult butterfly is much less common than is that of the imported 

 worm, but the two are considerably alike in general appearance while 

 in flight. When caught and examined closely the native cabbage butter- 

 fly is found to have more black markings on the wings, and the female 

 is much more heavily marked than the male. 



REMEDIES. 



What has been said about remedies for the other two species of 

 ''cabbage worms" covers the case completely for this species. (See page 

 27). The reader should remember that in most essential respects this 

 species is practically like the imported cabbage worm. 



THE DIAMOND-BACK MOTH. 



(Plutella maculipennis.) 

 Order Lepidoptera, Family Y ponomeutidw. 



Also called "The Cabbage Plutella," and "Cabbage Shot-hole Worm." 



Description. — The adult parent insect is a very small moth which 

 is so marked that Avhen the wings are closed there are diamond-shaped 

 spots or patches on the back, or upper surface, hence the name of 



