The Bulletin. 25 



June until mid-October. When young, eating the more tender por- 

 tions of the leaf. When full grown, eating the entire leaf, with the 

 exception of the principal veins and the mid-rib. 



The Egg. — The eggs of the Horn Worm (Fig. 9) are placed by the 

 female on the underside of the leaf, as a rule, although occasionally 



Fig. 9.-Egg of Southern Horn Worm, much 



more than natural size. 



(Photograph by the author.) 



they are to be found upon the upper surface. Usually they are 

 placed singly, but occasionally two or more are found side by side. 

 The eggs are light green in color, corresponding closely to the light- 

 colored under surface of the leaf; those found on the upper surface 

 of the leaf being several shades darker. In shape they are almost a 

 perfect sphere or ball. The surface is very smooth and shining and 

 an average egg measures about 1-25 of an inch in diameter ; in other 

 words, 25 eggs side by side would equal an inch. 



Larva, — The larvae or "worms" of the two kinds mentioned 

 above differ very decidedly. The larva of the Southern Horn Worm 

 (Fig. 10) is, as a rule, light green in color, with seven straight 



Fig. 10.— Larva of Southern Horn Worm, natural size. 



(Photograph by the author.) 



oblique whitish lines on the side of the body, extending from just 

 back of the head to the base of the horn. These oblique lines are 

 edged with black on their upper borders. The strongly curved horn 

 is red in color. Frequently dark forms occur in which the black 

 marks on the side of the body are extended and cover almost the 

 entire worm. 



The Northern Horn Worm varies (Fig. 11) in general color from 

 green to dark brown. Instead of the seven oblique bands found 

 on the sides of the body of the Southern worm, there is a ■eriei 

 of eight whitish v-shaped marks, extending from just back of the 



