30 



The Bulletin. 



When the caterpilhir, or "worm" is full grown it spins threads about 

 itself to form a loose sort of cocoon, usually on the under side of a leaf, 

 and inside this it changes to the chrysalis or jnipa state. The cocoon 

 is so thinly spun that the brown, spindle-shaped pupa can usually be 

 seen inside it. The moth emerges from the cocoon after a few weeks, 

 the exact length of time varying, no doubt, according to season and 

 locality. Ordinarily three weeks would probably represent the length 

 of the pupa stage. 



When cold weather comes in the fall, the last worms reach maturity, 

 change to pupae, and remain in that stage all winter. 



Fig. 13.— Adult moth of Cabbage Looper. Enlarged. (Drawing by Z. P. Metcalf.) 



REMEDIES. 



All that is said under the head of remedies for the imported cabbage 

 worm (page 27) will apply to this looper. It is combated with Paris 

 green (dry or as a spray) and by all the other means there discussed. 



The destruction of remnants is important with this species as with 

 the other, for the insect passes the winter in the pupa state, often on 

 old remnants and rubbish in the cabbage field. 



NATIVE CABBAGE WORM. 



(Pontia Protodice). 



Order LepidopUra, Family PieridiC. 



Description. — This is another of the "cabbage worms." In size and 

 general habit much like the imported cabbage worm, but is of a dark 

 greenish purple color with four pale j-ellow strips running the length 

 of the body. It is not so common or so destructive as the two "worms" 

 that have already been described. 



Life History, etc. — This insect is very closely related to the imported 

 cabbage worm (as one may observe if he cares to compare the technical 

 names), but it is a native of N'ortli America, Avhile the imported worm is 

 not. This native cabbage worm is found in practically all the inhabited 

 parts of North America, though it seems to be most at home in the 



