PREFACE. Vll 



States and Canada; " Pacilic States" to these same zones in Califoiiiiii, 

 Oreo-on, Washinoton. and British Columbia. "U. S." refers to the 

 whole of the United States and Canada. 



The abbreviations of the nam(\s of })ul>lications are i^ivcn in a more 

 extended form than in Stauding-er and Hel)er>s Catal<)ou(\ and it is 

 expected that they will be self explanatory to those haN'ing a gxnuu'al 

 knowledge of the literature. A list of works (quoted has. however, 

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

 those of the species by munl)ers. 



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 leciprocate by 

 sending- some of these missing species. 



Finally. I would express my obligation to ]\Ir. A. N. Caudell and to 

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

 |)reparation. 



Harrison G. Dyak. 



