Observations on the Habits and Habitats of Adult Dragonflies of Eastern India with Special Reference to the Fauna of West Bengal
Synopsis
Eastern India, in the present article, covers parts of the state of Assam, Bihar Sikkim and West Bengal. Physiographically Assam, North Bihar and Lower West Bengal (South of Darjeeling) belong to the Great Plains of India. In this there is no definite physiographic barrier to divide it further, though the eastern part is more humid than the western part. Rainfall increases steadily as one moves from the West to the East, rising from about 200 cms to about 400 cms in Assam. Today this is one of the most heavily populated rural areas. South Bihar belongs to the Chota Nagpur Region of the Peninsular uplands. This is characterized by the dry deciduous forests and the peninsular hills. Darjeeling of West Bengal is the part of the Eastern Himalaya. Like the physiography, localities have got different geological history. For instance, Purulia of West Bengal is the remnant of the Triassic Gondwana land, while Susunia Hills of Bankura district of West Bengal represent the Pleistocene formation. The Gangetic alluvium is considered to be of recent origin.
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