4 V. S. NATIONAL MUSEUM BULLETIN 209 



North Carolina Department of Agriculture, Raleigh, North Carolina. 



Kansas State College, Manhattan, Kansas. 



Morton Vogel, Washington, District of Columbia. 



University of Michigan, Ann Arbor, Michigan. 



North Carolina State College, Raleigh, North Carolina. 



University of Ohio, Columbus, Ohio. 



In the statement of the location of a specimen or a type, the city of 

 an institutional collection or the o\vner's name in the case of a personal 

 collection is used as the reference word. In Raleigh, North Carolina, 

 there are two institutional collections, that of the Department of 

 Agricultm-e and that of North Carolina State College. The former is 

 indicated by "Raleigh" and the latter by "State College, Raleigh." 



The many institutional and personal collections made available for 

 study have permitted correlation of the work of many collectors — 

 a tedious job; however, it has been of great value in giving a more 

 complete idea of the specific distribution and variation, the oppor- 

 tunity, at times, to correct initial misinterpretations with the study 

 of more material, and a more nearly complete record of the fauna 

 than would otherwise have been possible, I was particularly fortu- 

 nate in having the cooperation of Doctors H. E. Evans and P. D. 

 Hurd, who collected and sent a great many interesting specimens for 

 study. Dr. Evans also sent his flower records, notes on the species 

 of spiders captured as prey, and other biological notes. Much of 

 the material at the U. S. National Museum, on which this study 

 was initiated, was collected by Mr. J. C. Bridwell. Mr. George 

 Townes paid especial collecting attention to these wasps and sent 

 me many important specimens, mostly from Columbia, S. C. Mr. 

 R. R. Dreisbach assisted by sending manuscript copies of his papers 

 and by lending manuscript types for study. Opportunity to see 

 some of his extensive work on the genitalia of psammocharids, mostly 

 still unpublished, saved much time that would otherwise necessarily 

 have been spent in exploratory work on these structures. It might 

 be added that the brief treatment of them in the present paper does 

 not reflect their total taxonomic value, but rather that other struc- 

 tures are usually sufiicient for an accurate determination, and that 

 Mr. Dreisbach is about to publish photomicrographs of the genitalia 

 of nearly all the Nearctic species. Spider prey collected with certain 

 of the specimens were determined by Doctors H. H. Swift and B. J. 

 Kaston. Mr. K. V. Krombein has reviewed the manuscript with 

 the eye of an editor as well as of a hymenopterist, and has sent many 

 interesting notes and specimens for incorporation. 



All the types in North American collections except the Provancher 

 types and those of Pepsis have been studied. Comparisons with and 

 notes on the types of Dahlbom at Lund, Sweden, were made for me 



