This book focuses on those virus families that are found primarily or exclusively in insects, covering all major families of insect-selective viruses except for the baculoviruses which were described in a previous volume of "The Viruses" series. The topics include: the large DNA viruses; the small DNA densoviruses; the RNA viruses; and, the arbovirus expression systems and their potential employment in the future. Ninety-eight illustrations supplement the text.