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The butterfly diversity was surveyed in Cotton University Campus, Guwahati, Assam. A total of 39 species and 511 individuals were recorded, Psyche being the most dominant butterfly species (n=47). The maximum number of species encountered was in family Nymphalidae (n=14) while minimum in family Hesperidae (n=3). Number of individuals encountered was maximum in family Pieridae (n=158) while minimum in family Hesperidae (n=4). Diversity was most in the family Nymphalidae (H=2.33, D=8.81) while least in family Hesperiidae (H=1.04, D=2.67). Evenness was maximum in the family Hesperiidae, (EH=0.95, ED=0.89) while minimum in family Papilionidae. (EH = 0.73 and ED= 0.55).
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