Synopsis Contents: Acknowledgements. Classification adopted. 1. Introduction: i. Diagnosis. ii. Zoological position. iii. Instinct and habit. iv. Classification. v. Number of species. vi. Nomenclature. vii. Identification. viii. Entomology in India. ix. Zoo-geographical divisions. x. Food and habitat. xi. Insects and man. 2. Aptera. 3. Orthoptera: i. Where insects live. ii. Cosmopolitan insects. iii. Deceptive colouring. iv. Attraction to light. 4. Neuroptera: i. Gregariousness. ii. Aquatic insects. iii. Relative duration of life. 5. Hymenoptera: i. Galls. ii. Size of insects. iii. Sex. iv. Insects and flowers. 6. Coleoptera: i. Myrmecophilous insects. ii. Insects as food. 7. Lepidoptera: i. Migration. ii. Emergence from the cocoon. iii. Silk. iv. How insects protect themselves. 8. Thysanoptera. 9. Diptera: i. Blood-sucking insects. 10. Rhynchota: i. Song in insects. Index of plants. General Index.