Three of the six chapters of this book are written by the editors; they concern the evolution of heritable endosymbionts, insect cytoplasmic incompatibility (in Drosophila, Tribolium, Nasonia, and mosquitoes), and possible relationships between symbionts and pest control. . . . Richard Stouthamer has contributed a well-plotted and informative chapter, Wolbachia-induced parthenogenesis. . . . The complementary chapter by Hurst et al. covers male-killing and sex-ratio distorters (i.e., the prevention of Y or 'null' or Z chromosomes from participating in embryonated eggs), and that by Rigaud reviews pertinent situations in isopods and amphipods, among other crustaceans. . . . The contents of the chapters by Rigaud, Stouthamer, and Hurst et al. are not easily located in recent, accessible literature. They are new and skillful contributions for most of us. --The Quarterly Review of Biology<br>