LETTER OF TRANSMITTAL. 



U. S. DEPARTMENT OF AGRICULTURE, 



DIVISION OF ENTOMOLOGY, 

 Washington, D. 0., June 12, 1889. 



SIR : In the absence of Professor Riley, who is now at the Paris Ex- 

 position in official capacity, I beg to submit for publication Parts I, II, and 

 III of the Bibliography of American Economic Entomology, which was 

 ordered by Congress in July, 1882. Owing to various unforeseen delays 

 this work has not yet been completed. Its preparation was originally 

 assigned by Professor Riley to Mr. B. Pickman Mann, formerly of this 

 Division, and upon the severance of his connection with the Depart- 

 ment, in the fall of 1885, it was turned over in an incomplete and frag- 

 mentary condition to Mr. Samuel Henshaw, of Boston, who has added 

 greatly to it and practically rewritten the portions already prepared. 



The extent of the work renders it advisable to publish it in several 

 parts, and as there is unquestionably a more urgent need on the part of 

 working economic entomologists for a bibliography of the writings of 

 B. D. Walsh and C. Y. Riley than of others, on account of their great 

 number and value, these portions have been finished first. Their imme- 

 diate publication will probably antecede the publication of the final part 

 only by a few months. 



Very respectfully, yours, 



L. O. HOWARD, 



Acting Entomologist. 

 Hon. J. M. RUSK, 



Secretary of Agriculture. 



