ECONOMIC ENTOMOLOGY. 27 



least two parasites, and die very often from disease, espe- 

 cially in wet weather, so that they are never likely to increase 

 quite as badly as the butterflies just now described. 



Fig. 29. Fig 30. 



Cabbage Plusia and Larva. 



" When full-grown, this worm weaves a very thin, loose 

 white cocoon, sometimes between the leaves of the plant on 

 which it fed, but more often in some more sheltered situation, 

 and changes to a chrysalis, which varies from a pale yellow- 

 ish green to brown, and has a considerable protuberance 

 at the end of the wing and leg cases, caused by the 

 long proboscis of the inclosed moth being bent back at that 

 point. This chrysalis is soft, the skin being very thin, and 

 it is furnished at the extremity with an obtuse roughened 

 projection which emits two converging points, and several 

 short curled bristles, by the aid of which it is enabled to 

 cling to its cocoon. 



" The moth is of a dark smoky-gray, inclining to brown, 

 variegated with light grayish-brown, and marked in the 

 middle of each front wing with a small oval spot and a 

 somewhat U-shaped silvery white mark, as in the figure. 

 The male is easily distinguished from the female by a large 

 tuft of golden hairs, covering a few black ones, which 

 springs from each side of his abdomen towards the tip. 



"The suggestions given for destroying the larvte of the 

 cabbage butterflies, apply equally well to those of the Cab- 



