THIS VOLUME 



IS RESPECTFULLY DEDICATED TO 



DR. ('ARL W. VON DALLA TORRE 



THE EMINENT BOTANIST AND HYMENOPTERIST, PROFESSOE IN THE 

 UNIVERSITY OF INNSBRUCK, WHO, IN THE COMPILATION OF 

 "CATALOGUS HYMESOPTERORUM," HAS DONE SO 

 MUCH FOR WORKING H YMENOPTERISTS 



THE AUTHOR 

 Washington, D. C, January, 1904 



