6 Introduction 



quence. The abbreviations of journal references follow in general the 

 scheme proposed in the World List of Scientific Periodicals with minor excep- 

 tions, the chief difference being that the names of countries, states, cities 

 and other geographical units are not abbreviated. A few references are 

 listed under their titles rather than under the abbreviations of the journals 

 in which they were published, because in these cases the titles are usually 

 better known than the journals, for example, Van Duzee 1917 Cat. Hemip. 

 North America not Techn. Bull. California Agr. Exp. Sta. Ent. 2. If the 

 journal has been published in series the abbreviation of the journal is fol- 

 lowed by a series number or by such an abbreviation as n. s. (new series), 

 o. s. (old series), n. f. (neue Folge), or the like. This is followed by a note 

 indicating the nature of the reference. 



The notes which follow the references are generally self explanatory, but 

 three points may be mentioned here. Such notations as "[described]," 

 "[notes]," "[key]," and the like are intended to be suggestive rather than 

 precise or exclusive. The notation "[error]" means not accepted in this 

 catalogue. Usually the latest published synonymy is accepted, but not al- 

 ways. The other notation "[comparative note]" is used to designate those 

 references, often of the greatest taxonomic significance, in which two ge- 

 neric, specific or other groups are compared. All references have been checked 

 against the original save those marked with an asterisk (*), which have been 

 accepted from reliable sources. Every effort has been made to have the 

 references full and complete and to give an indication of the character of the 

 data contained. Where the writer knows that reprints have been issued with 

 different pagination, this is indicated in parenthesis following the page num- 

 bers of the original. In a few cases, where the matter has been reprinted 

 under a different title with different pagination, separate references are 

 given. Where authentic editions have been published these have been indi- 

 cated by separate references. Genera established without included species 

 have been dated from their original description, with their type fixation 

 dated at the time of the first inclusion of species. Original spellings have 

 been retained in all cases, except obvious typographical errors. The species 

 have also been listed under every known combination so that it is possible 

 to find any species without recourse to the index, which will be published 

 at the completion of the Fascicle, together with the full bibliography. 



A catalogue is not a revision of a group and the location of the genera and 

 species in the present catalogue is merely an attempt to reflect what is be- 

 lieved to be the general consensus of the best authorities at the present 

 time. Doubtful genera and species have been included to call them to the 

 attention of subsequent revisers. 



Under the family, subfamily and tribal categories we have attempted to 

 include those references which we believe belong in the respective categories 

 regardless of the designation given by the author. Thus, a reference to the 



