THE EUROPEAN HORSE-RADISH WEBWORM. 7 



broken white lines and the yellow spiracular stripes, but by degrees, after it 

 settles down to feed again and grow, the black skin expands and the gi-ound- 

 colour of the back becomes more and more green until it is again of a blackish 

 olivaceous-green, when the length ranges from 13 to 16 mm. 



Fig. S. — Ilorsi'-radisli leal' skfUtoiii/.iil by tlio Europeau horsc-railish wcbworm. 



It now consumes a great quantity of food and (lie plump skin begins to shine 

 a little; at the end of about ten days it allaius full-growth. 



