LETTER OF TRANSMITTAL. 
United States Department of Agriculture, 
Division of Entomology, 
Washington, 1). C, April 15, ls<)C>. 
Sir : I have the honor to submit for publication the fourth number 
of the technical series of bulletins of this Division. It is composed of 
a group of articles, chiefly of a descriptive character, which relate to 
injurious insects liable to be imported into the United States. 
Respectfully, 
L. (). Howard, 
Entomologist. 
Hon. J. Sterling Morton, 
Secretary of Agriculture, 
