46 N. S. ENTOMOLOGICAL SOCIETY 



Fourth Instar. This stage differs from the preceding three 

 in size and color, also in the absence of any tubercles or spines. 

 The head, prothorax, penultimate, and anal segments, and the 

 legs bear a few short hairs, otherwise these are entirely absent. 



Color, pale yellow, with a fine, distinct black line length- 

 wise of the dorsum and a fainter and more irregular one on 

 each of the subdorsal margins, these being wider, where they 

 cross the segmental margins. Spiracles, black. Meso and 

 metathorax, bear a crescent shaped black marking on the ventral 

 lateral margins, while the prothorax bears one of irregular shape 

 in the same position. Prothoracic shield, dark grey, mottled 

 with small spots of black. Head, dark yellow, with a dark 

 marking on the dorsal surface. Mandibles, yellow, black at the 

 tips. Legs, yellow, except the coxae and tarsi, which are black 

 while the joints are banded with black on the outside surfaces. 



Length oj body, 7 m.m. — 7.25 m.m. Greatest width 4 m.m. — 

 4.15 m. m. Width of prothoracic shield, 2.43 m. m.-2.51 m. m. 

 Width of head, 1.62 m. m — 1.70 m. m. 



The Pupa. 



Upon attaining full growth, the larva enters the ground at 

 the base of its host plant, and there forms an earthen cocoon 

 in which it pupates. 



Description. On the ventral surface of the pupa, the 

 wings, head and antennae of the future adult are distinctly vis- 

 ible. Only two pairs of legs can be seen, the first pair being 

 covered by the others. The wings and third pair of legs 

 reach to the seventh abdominal segment, while the caudal seg- 

 ments show some development. The margins of the body 

 bear a few, short, brown spines. 



Color, pale yellow. Eyes, pink. Anal segment, very dark 

 brown. 



Length, 7.15 m. m.-7.29 m. m. Width 4.32 m. m.-4.45 m. m 

 The Adult. 



Upon emerging from its cocoon, the adult feeds for from 

 three to four weeks, the amount consumed gradually becoming 

 less towards the end of that time. It then enters the loose soil 

 or decaying vegetable matter, where it hibernates. 



