209 



Fig. 218. The Clover Plant-louse, Macrosiphum Irifolii. 

 U. S. Dept. of Agriculture.) 



Enlarged as indicated. (Pergande, 



Myzus achyr antes Monell. 



Colonies of this species appeared on corn in a large experimental 

 breeding-cage at my office August 19. Some females were giving birth 

 to young. All that could be found there on this and the following day 

 were killed. However, on August 29 winged examples and young were 

 abundant, mostly on the under sides of the upper leaves. September 

 12 they were still abundant, and examples were also taken by sweeping 

 in a corn field in June. I have previously treated this as a sugar-beet 

 insect,* the colonies of leaf-lice occasionally found by us on sugar-beet 

 leaves all belonging to this species. It, was originally described from 

 examples found in Missouri on a plant of the pigweed family, and has 

 been found on the common pigweed, Amarantus. These are probably 



*Twenty-first Report State Ent. 111., p. 82. 



