The book contains four chapters. The 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. The second chapter refers to biology of dragonflies which highlights life cycle, fecundity, habitat, behaviour, migration and endangered species. The third chapter 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.