PLATE I. 



Fig. 1. — Dorsal view of advilt female fly. Greatly enlarged. 



Fig. 2. — Wing of adult fly. Greatly enlarged. 1-6, veins; cos, costal vein; ant. c. v., 



anterior cross vein. 

 Fig. 3. — Egg showing contents and gelatinous cap at anterior end. Greatly enlarged. 

 Fig. 4. — Side view of the anterior and posterior portions of the larva or maggot. 



Greatly enlarged, fd. or., feeding organ or rake; sp., spiracle; tr., tracheal 



trunk. 



