iii the Western States, for fully one-half if mil more of my material has 

 come from the Western States, will not be out of place in a scries of works 

 illustrative of the extinct and living animals, 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 the Rocky Mountains, and to thank you for 

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

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

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

 I have thus been enabled to add greatly to the usefulness of the essay to 

 western entomologists. 



1 am, sir, with much respect, yours, very truly, 



. A. S. PACKARD, Jr. 



Prof. F. V. IIayijen, 



Geologist-in-charge of the U. S. Geological and 



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



