2 



in I lie Western States, for lully otie-lmlf if not more of my material has 

 come from llii' Western States, will not he out of place in a series of works 

 illustrative <il' tlie exliuet and living auimals, now in course of publication 

 under your direction. 



In closing, allow me to express my appreciation of the impetus you have 

 already given by the reports published under the auspices of the survey to 

 our knowledge of the insects of tin; Rocky Mountains, and to thank you for 

 the kind interest you have taken in the preparation of this work, and for the 

 incnuised value you have given it by extending to me the hospitalities of the 

 survey for a few \\eeks in Colorado and Utah during the present season. 

 1 have thus l)een enabled to add greatly to the usefulness of the essay to 

 western entomologists. 



I am, sir, with much respect, yours, very tridy, 



A. S. PACKARD, Jr. 



Prof F. V. IIayden, 



Geologlst-in-cliarge of the U. S. Geological and 



Geographical Survey of the Territories, Washington, D. C. 



