responsible for the transfer is the author 

 of that section unless the name of another 

 specialist is included. 



There are also a number of instances where 

 a taxon formerly considered to be a species is 

 treated here as a subspecies of another taxon, 

 or where a taxon. formerly considered to be a 

 subspecies is now raised to specific rank. The 

 authority responsible for the change is the 

 author of that section unless the name of 

 another specialist is included. These are usu- 

 ally cited in the text as clavatum johannis 

 (Richards), n. status or alba Rohwer, n. 

 status. 



The words — changed status — occasionally 

 follow the author of a species-group name. 

 This indicates that the taxon has a rank 



different from that accorded it elsewhere. It 

 is not the same as new status for it reflects a 

 change which has already been published. 



In a few taxa, the words — revised status — 

 follow the author of a species-group name. 

 This denotes a taxon which has been removed 

 from synonymy. 



There are a few new synonyms at the 

 genus-group level and numerous new syn- 

 , onyms at the species-group level. These are 

 indicated by the abbreviation N. syn. follow- 

 ing the bibliographic citation of the new syn- 

 onym. As noted above, the synonymy is to be 

 attributed to the author of the section unless 

 the name of another specialist appears in 

 parentheses following the abbreviation N. syn. 



Volume 3 



It is intended that Volume 3 will contain 

 separate indexes to the taxa of Hymenoptei'a, 

 and to their hosts, parasites, prey, predators, 

 and pollen and nectar sources. Preparation of 

 the indexes has already begun, and we antici- 

 pate that the tapes for Linotron production 

 will be sent to the Government Printing Office 



during 1978. We will also include in Volume 

 3 a tabulation of the number of valid genera 

 and species for each family and higher cate- 

 gory, and lists of the nomenclatural and 

 taxonomic changes other than the new names 

 which are listed above. 



Acknowledgments 



Preparation of the catalog and funding for its 

 publication have had the enthusiastic support 

 of Porter M. Kier, Director, National Museum 

 of Natural History (NMNH), Smithsonian 

 Institution (SI) and of Lloyd V. Knutson, 

 Chairman, Insect Identification and Beneficial 

 Insect Introduction Institute, U.S. Depart- 



ment of Agriculture. The catalog in its printed 

 form could not have been achieved without 

 their help, and we are most grateful that 

 their assistance was available whenever we 

 required it. 



We are indebted to a host of cooperating 

 hymenopterists for generous assistance which 



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