The book contains four chapters. First chapter deals with biodiversity of dragonflies to be utilized in biological pest control under which 15 new species of dragonflies have been described and six redescribed. Second chapter refers to biology of dragonflies which highlights life cycle, fecundity, habitat, behaviour, migration and endangered species. The chapter third is devoted for utilisation of dragonflies in biological control of insect pests which contain predator-prey index of dragonflies,mass rearing methods of dragonflies, methods of biological pest control and biocontrol programmes designed with dragonflies. The last chapter refers to bibliography. Biological pest control method is ecofriendly and very good altermative for chemical pest control and its demerits. The present book is useful guide for students, teacher, scientists, industrialist and other workers in biological pest control. Table of Contents* Chapter 1: Biodiversity of Dragonflies* Chapter 2: Biology of Dragonflies* Chapter 3: Utilization in Biological Pest Control Programme.