LETTER OF TRANSMITTAL. 
U. S. Department of Agriculture, 
Bureau of Entomology, 
Washington, D. C, December 28, 1911. 
Sir: I have the honor to transmit herewith for publication the 
manuscript of a bulletin on the spring grain-aphis, popularly known as 
the ''green bug," by F. M. Webster and W. J. Phillips, of this bureau. 
The investigations upon which this bulletin are chiefly based began 
under a special appropriation made by Congress in the spring of 
1907. These investigations have been continued without inter- 
ruption up to and including 1911. PreHminary reports upon the 
work were published in Circulars Nos. 85 and 93. The present 
report, however, is a complete record of the entire investigation, 
including many aspects of the problem not before touched upon 
in any publication relating to this group of insects. I recommend 
the publication of this manuscript as Bulletin No 110 of the Bureau 
of Entomology. 
Respectfully, 
L. O. Howard, 
Entomologist and Chief of Bureau. 
Hon. James Wilson, 
Secretary of Agriculture. 
