Incluye referencias bibliográficas e índice. CONTENIDO: Introducing Hymenoptera and their Conservation -- Alien Hymenoptera in Classical Biological Control -- The Junction of Biological Control and Conservation: Conservation Biological Control and Cultural Control -- Introduced Bees: Threats or Benefi ts? -- Social Wasps and Ants as Aliens -- Pollinator Declines -- Levels of Conservation Concern and the Shortcomings of Current Practice -- Habitat Parameters and Manipulation -- Species Case Histories -- Assessing Conservation Progress and Priorities for the Future.