1972 121 p., 173 figures, numerous maps, paperbound. Small library stamp and inscription on front cover, right top edge. Otherwise a good and clean copy.This is a continuation of earlier studies by the author on the sphecoid wasp tribe Cercerini of North America. Now 36 new species and subspecies are described, in total the book contains 85 entries. All species and subspecies are recorded and illustrated on distribution maps. Morphological characters are illustrated in 173 drawings. Beetle prey and floral visiting habits are recorded when known. This is Smithsonian Contributions to Zoology, number 110.