Data on field observations on the habits and habitats of adult Odonata of eastern India–Eastern Himalaya (Darjiling and Sikkim), Assam Valley, Chhotanagpur plateau (Hazaribagh of Bihar and Purulia of West Bengal) and Ganga Plain have been collected since 1966.
Observations could be made on the following subjects viz.
(A) Interspecies relation (Predator-prey relation, competetion for breeding territory, interspecies pair formation); (B) Intraspecies relation (Defence of breeding territories, disturbances to other breeding pairs, fight for food); (C) Reaction towards moving objects; (D) Death in adult dragonflies (Natural death, death due to attack of predators – lizards, birds, spiders and ants; due to starvations; accidents caused by automobiles and due to unknown cause); (E) Non-Odonata prey; (F) Records of Odonata entering houses of Calcutta and suburbs; (G) Migratory flights; (H) Posture of rest/perch; (I) Thermoregulation; (J) Vertical ranges of fllghl; (K) Breeding seasons; (L) Dimenslons of breedlng territories; (M) Emergence of imago.
Observations were made on following species; Copera marginipes Rambur, Pseudagrion r. rubriceps Selys, Pseudagrion microcephalum (Rambur), Ceriagrion coromandeliarium (Fabrlcius), Ceriagrion cerinorubellum (Brauer), Ceriagrion olivaceum Laidlaw, Aciagrion pallidum Selys, Ischnura a. aurora Brauer, Ischnura senegalensis (Rambur), Agriocnemis p. pygmaea (Rambur), Onychargia atrocyana Selys, Ictinogomphus rapax (Rambur), Lathrecista a. asiatica (Fabricius), Orthetrum s. sabina (Drury), Bradinopyga geminata (Rambur), Zyxomma petiolatum Rambur, Crocothemis s. servilia (Drury), Diplacodes trivialis (Rambur), Brachythemis contaminata (Fabricius), Trithemis pallidinervis (Kirby), Neurothemis t. tullia (Drury), Neurothemis i. intermedia (Rambur), Pantala flavescens (Fabricius), Tholymis tillarga (Fabricius), Rhyothemis v. variegata (Linnaeus). References on the habits and habitats of adult Odonata observed by the author and others, in other parts of India have been mentioned in the discussions.