Catalog of 



Hymenoptera in America 



North of Mexico 



Prepared cooperatively by 



specialists on the various groups of Hymenoptera 



under the direction of 



Karl V. Krombein and Paul D. Hurd, Jr. 



Smithsonian Institution 



and 



David R. Smith and B. D. Burks 



Systematic Entomology Laboratory, 



Insect Identification and Beneficial Insect Introduction Institute 



Science and Education Administration, 



United States Department of Agriculture 



VOLUME 2 



Apocrita (Aculeata) 



SMITHSONIAN INSTITUTION PRESS 



Washington, D.C. 



1979 



