26 



The Bulletin. 



Fig. 11.— Larva of Northern Horn Worm. 

 (Photograph by the author.) 



head to beneath the horn. These whitish marks are not edged with 

 blackish as in the Southern form. Horn straight or but slightly 

 curved, black. 



Pupa. — The pupae of Horn Worms are generally called "pitchers" 

 (Fig. 12), because the long tongue case resembles the handle of a 



Fig. 12.— Pupa of Southern Horn Worm, natural 



size. 



(Photograph by the author.) 



pitcher. The pupae of both kinds of Horn Worms are brownish, 

 cylindrical objects, sharply pointed at one end and with a con- 

 spicuous tongue case at the other. To the casual observer the chief 

 difference in the two forms is the length of the tongue case (the 

 sheathlike affair of the pupa which encloses the long, sucking tongue 

 of the adult moth). In the Northern Horn Worm the tongue case 

 is long and slender, reaching almost a third of the length of the 

 body of the pupa. In the Southern Horn Worm it is stouter and 

 shorter, scarcely ever reaching a fourth of the length of the body of 

 the pupa. 



