Foreword / by Bert Hölldobler -- Darwin's Dilemma and the Spirit of the Hive -- What Is the Spirit of the Hive? -- Individual Variation in Behavior -- The Evolution of Polyandry -- The Phenotypic Architecture of Pollen Hoarding -- The Genetic Architecture of Pollen Hoarding -- Reproductive Regulation of Division of Labor -- Developmental Regulation of Reproduction -- The Regulatory Architecture of Pollen Hoarding -- A Crowd of Bees.