The present publication is intended primarily to serve the needs of those who teach or study entomology as an academic subjects. The publications includes Insects Nutrition Feeding, The Tracheal System, Aquatic Respiration inInsects, The Circulatory System, Nitrogenous Excretion and Salt and Water Regulation The Nervous System and Sensory System Etc. The publication will be of great value to all the students of entomology and agriculural sciences in several universities.