LETTER OF TRANSMITTAL. 
United States Department of Agriculture, 
Division of Entomology, 
Washington, D. C, June 15, 1895. 
Sir: I have the honor to submit for publication the first number of 
the proposed technical series of bulletins, which, on account of their 
character, are intended especially for working entomologists, learned 
societies and periodicals, and libraries. The Aphelinime, which are 
monographic-ally considered in this first number, are insects of great 
economic importance, since they comprise the most abundant of the 
parasites of our destructive scale insects. 
Respectfully, L. O. Howard, 
Entomologist. 
Hon. J. Sterling Morton, 
Secretary of Agriculture. 
