Members of the Hymenopteran order range from the familiar ants, bees, and wasps to a huge variety of predatory, parasitic, and plant-feeding insects. They are of immense economic significance, primarily as pollinators but also because of their increasing use as biological control agents. For many years, Costa Rica has been a prime location for research in neotropical ecology and as a result is an ideal area for extensive research on the Hymenoptera. "The Hymenoptera of Costa Rica" is the first published study of its kind. It covers the classification, biology, morphology, and economic importance of the group, with illustrated keys to families and subfamilies. Numerous photographs and an extensive bibliography of key works for the study of Central American Hymenoptera make this a good resource for researchers and biological control scientists.