DESCRIPTION OF THE PLATE. 



Fig. 1. Clear- winged wheat-fly, Cecidomyia Tritici. 



Fig. 2. Spotted- winged wheat-fly, Cecidomyia cereaUs. 



Fig. 3, Cecidomyia thoracica. 



Fig. 4. Male of the clear-winged wheat-fly. 



Fig. 5. Cecidomyia tergata. 



Fig. 6. Wheat-fly at rest, with its wings in their natural position. 



Fig. a. Kernel of wheat, its chaff parted down to show the worms in their usual 

 situation. 



Fig. 6. A mature worm or larva, highly magnifl«d. 



Fig. c. Wheat-head, with the chaff at * * * as bent down by the yellow-bird 

 in feeding upon the worms, the kernels remaining at ft- 



Fig. e. Part of a male antenna. 



Fig. /. Tip of the abdomen, with the ovipositor drawn out (from Curtis] . 



Fig. g. Foot of a wheat-fly, highly magnified to show its several joints. 



Fig. h. Part of a female antenna. 



Fig. i. Wheat-fly in its natural size. 



Fig. k. Magnified wing of Cecidomyia cerealis. 



Fig. I. Magnified wing of Cecidomyia caliptera. 



