THE LEPIDOPTERA 



289 



The life history in both species is quite similar. Winter is passed 

 as a pupa (Fig. 306) iu the ground and in these insects the tongue 



Fig. 306. — Pupa of the Southern Tobacco Worm (left) and of the Northern Tobacco 

 Worm (right), natural size. Note difference in length of the tongue case. {From 

 Britton, Sixth Rept. Ent. Conn. Agr. Exp. Sta. 1906.) 



Fig. 307. — Full-grown larva of Southern Tobacco Worm, natural size. (From Britton, 

 Sixth Rept. Ent. Conn. Agr. Exp. Sta. 1906.) 



has a separate case in the pupa. The moths appear in the spring 

 and lay their eggs singly on the leaves of their food plants, and the 



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