LETTER OE TRANSMITTAL. 
U. S. Department of Agriculture. 
Bureau of Entomology, 
]YasMngton, D. C, December 13, 1909. 
Sir: I have the honor to transmit herewith for publication a 
manuscript entitled "Plant-bugs Injurious to Cotton Boll-.'* by Dr. 
A. W. Morrill, entomologist of the Arizona Horticultural Commission 
and of the Arizona Agricultural Experiment Station, Phoenix, Ariz. 
The work upon which this manuscript is largely based was con- 
ducted by Doctor Morrill and this report prepared and submitted by 
him while he was a special field agent of this Bureau. It grew out of 
an investigation of the so-called "conchuela" of northern Mexico, a 
plant-bug which has proved to be especially destructive to cotton 
bolls. The same insect pest was studied further in western Texas, 
and other species were investigated both there and in other sections 
of the United States. 
Although the injury to the cotton crop effected by plant-bugs is of 
course secondary to that caused by the boll weevil, yet it is by no means 
inconsiderable and renders necessary a knowledge of the life histories 
of these injurious bugs and of the best methods for their control. 
I would therefore recommend the publication of this manuscript as 
Bulletin Xo. 86 of the Bureau of Entomology. 
Respectfully. 
L. 0. Howard. 
Entomologist ami Chief of Bureau. 
Hon. James Wilson, 
Secretary of Agriculiun . 
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