U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ENTOMOLOGY— BULLETIN No. 86. 



L. O. HOWARD, Entomologist and Chief of Bureau. 



PLANT-BUGS INJITRIOUS TO 

 COTTON BOLLS. 



BY 



A. W. MORRILL, Ph. D., 



Entomologist of the Arizona Horticultural Commission and of the Arizona Agricultural 



Experiment Station. 



Issued June 14, 1910. 



WASHINGTON: 



GOYERNMENT PRINTING OFFICE 



1910. 



