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Hymenoptera of America north of Mexico. Synoptic catalog. First, second supplement.
1958-1967 Two parts in two. 303, 584 p., uniform light olive buckram with printed title on the spines. The main work was published in 1951 as Agricultural Supplement 2 and included references up to 1949, roughly. The first supplement lists all relevant publications from 1950-1956, and includes some taxonomical notes itself. the second supplement deals with new publications and researches from 1957 to 1963, in some sections even to 1964, and includes additions to distributions, hosts and prey, etc.. Library stamp on front paste-downs, otherwise good clean copies.
