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



Plate II. 



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



Fig. 1. — Larva., dorsal view. Photographed from life. The young larva of an external 

 hymenopterous parasite may be seen attached to middle of larva of Cerodonta on the right, 

 much enlarged . Fig. 2.— Larva, lateral view, from life, showing polished surface and con- 

 tents of alimentary canal, much enlarged. Fig. 3.— Tip of barley leaf, showing feeding 

 punctures made by adult fly, much enlarged. Fig. 4.— Leaf blades showing advanced 

 work of the larvse, about natural size. Fig. 5.— Leaf blade, showing mines of voung larvee, 

 about natural size. Fig. 6.— Type of rearing cage used in rearing'the larvre of C. dorsalis. 

 Fig. 7.— Puparia, dorsal and ventral views, much enlarged. (Original. 1 



