Muesebeck, C. F. W.; Krombein, K. V.; Townes, H. K. 1951. Hymenoptera of America North of Mexico, Synoptic Catalog. U.S. Department of Agriculture, Agricultural Monograph Number 2 2
Muesebeck, C. F. W.; Krombein, K. V.; Townes, H. K. 1951. Hymenoptera of America North of Mexico, Synoptic Catalog. U.S. Department of Agriculture, Agricultural Monograph Number 2 2