2 Introduction 



references are as well or better known than the country or province, such 

 localities are given, e.g. "Singapore", "Manila", "Calcutta", etc. Also, if 

 the only locality recorded is general or indefinite or not recognizable, the 

 term is quoted as in the original description, e.g. "South America", "Ama- 

 zons," "East Indies," "Cape," "St. Johns," etc. In cases in which we have 

 seen specimens from localities not previously recorded in the literature, 

 such localities are included. Locality citations to the bibliography are 

 indicated by superscript numbers. At least one good reference is given for 

 each locality but no attempt has been made to give every reference for each 

 locality since in many cases practically all of the citations refer to the same 

 locality. 



From our discussions and correspondence with fellow workers in the 

 field of nomenclature we are convinced that American entomologists are 

 not willing to adopt the capitalization of specific names even though de- 

 rived from proper nouns and we are therefore using the small initial letter. 

 However, the exact form used in the original description is of course fol- 

 lowed in the reference so that if the specific name was capitalized by the 

 original author it is so indicated in the citation. Thus dedications and geo- 

 graphical names may at once be recognized. 



We believe, also, that homopterists are abandoning the use of tri- 

 nomials. These are given in this catalogue only when it has been impossible 

 because of lack of material to reduce the subspecies to synonymy or to 

 recognize it as distinct. 



The author is under obligations to many hemipterists throughout the 

 world who have furnished material, manuscripts and suggestions used in 

 the course of this study, and take^ this opportunity of expressinghis appreci- 

 ation of the assistance rendered particularly by Mr. E. P. Van Duzee of 

 San Francisco, Professor C. F. Baker of Los Banos, Mr. R. C. McGregor 

 of Manila, Mr. E. Jacobson of Sumatra, Mr. W. E. China of the British 

 Museum, Mr. S. A. Rohwer of the Smithsonian, Mr. C. Boden Kloss of 

 Singapore, Dr. V. Lallemand of Belgium, the late Dr. E. Bergroth of 

 Finland, the late Mr. L. B, Woodruff of New York and the late Mr. W. L. 

 Distant of London, all of whom have been most generous in furnishing 

 specimens, making comparisons with type material, or allowing study of 

 collections. Special thanks are due Professor Z. P. Metcalf of Raleigh, 

 North Carolina who has very kindly criticized and corrected a considerable 

 portion of the manuscript, to Dr. F. W. Coding of Livermore Falls, Maine 

 who permitted us to see the advance sheets of his Monograph of South 

 American Membracidae, and to Dr. H. M. Parshley who has made most 

 valuable and helpful suggestions throughout the course of this work. 



This catalogue is presented with many misgivings on the part of the 

 author who has been forced to conclude after many years work in collect- 

 ing the material that there are doubtless numerous errors which will be 



