Bui. 432, U. S. Dept of Agriculture. 



Plate I. 



The Spike-Horned Leaf-Miner (Cerodonta dorsalis). 



Fig. 1. — Cerodonta dorsalis: Adult female, dorsal view, greatly enlarged, la, Head of same, 

 lateral view, showing tooth or horn at tip of antenna, more enlarged. Fig. 2.— Section of 

 leaf blade showing eggs in situ and also young larvse beginning their mines, slightly 

 enlarged. 2a. Egg, greatly enlarged. Fig. 3. — Larva, lateral view, much enlarged. 3a, An- 

 terior stigmal process, more enlarged. Fig. 4. — Puparium, dorsal view, greatly enlarged. 

 Fig. 5.— Section of barley stem, showing usual position of puparium beneath leaf sheath. 

 Fig. 6. — Polycystus foersteri, a hymenopterous parasite of C. dorsalis; dorsal view, very 

 greatly enlarged. (Original.) 



