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. PreUminary 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. 



