Dragonflies are predators, they themselves are subject to predation by frogs, spiders, fish, water bugs, birds, lizards, and even other large dragonflies. Dragonflies have great agricultural importance because they are voracious predators of those insects which are pest of many field crops. In the present studies about 600 specimens of the order Odonata were collected from the various localities, include sixteen species belonging to eleven genera, representing three families, two subfamilies of the suborder Anisoptera, and were described in detail with special reference to their male and female genitalia from Sindh, Pakistan. The research techniques and information are helpful for graduate and research students of Zoology, Entomology, and Agricultural Sciences.