From the introduction:
"Bihar lies in the eastern part of India, bounded on the north by Nepal, on the east by West Bengal, on the south by Orissa, on the northwest by Uttar Pradesh and on the southwest by Madhya Pradesh. Besides some sporadic information about the bat fauna of Bihar by various authors, no consolidated taxonomical and ecological account is available. The present paper removes this lacuna in our knowledge. Collections were made by the author during 1977-82 from various parts of northern and southern
Bihar covering all the 33 districts. Some material from Bihar as well as other states in India, and Burma, Nepal, Pakistan. and Sri Lanka, available in the Zoological Survey of India, Calcutta, was also studied. Twenty-seven known species and subspecies from Bihar have been thoroughly studied in this paper. A key for the identification of bats of Bihar has been provided. Diagnosis, distribution and systematic notes for each species other than those reported by Sinha (1980) have been given."