PREFACE. VII 



States and Canada; " Pacific States" to these same zones in California, 

 Oregon, Washington, and British Columbia. tk U. S." refers to the 

 whole of the United States and Canada. 



The abbreviations of the names of publications are given in a more 

 extended form than in Staudinger and Rebel's Catalogue, and it is 

 expected that they will be self explanatory to those having a general 

 knowledge of the literature. A list of works emoted has, however, 

 been added. In the index the references to the genera are by pages, 

 those of the species by numbers. 



Species with an asterisk (*) preceding the serial number are not 

 represented in the collections of the United States National Museum, 

 and it is hoped that persons receiving this Bulletin will reciprocate by 

 sending some of these missing species. 



Finally, I would express my obligation to Mr. A. N. Caudell and to 

 Miss \Vellesca Pollock, who have kindly assisted me in the work of 

 preparation. 



HARRISON (i. DYAR. 



