Bui. 491, U. S. Dept. of Agriculture. 



Plate IV. 



Work of Larv/e of Melon Fly in Watermelon Vine. 



Succulent watermelon vine sectioned to expose well-grown larvse of the melon fly which have eaten 

 out the interior, causing the vine to wither and die back to the point of original infestation. 

 (Original.) 



