The present study deals with study of aquatic Coleoptera species of Ghaga Beel. The geographical position of the Beel is 26o 28 ∕ 21.10 // N –to 26 o 28 / 25.05 //N and 91 o 28 / 51.84 // E to 91 o 29 / 19.80 // and covering an area of about 50 hectares. The present study revealed presence of 12 species of aquatic Coleoptera comprising of 4 families. The family Gyrinidae comprising of 1 species, Noteridae comprising of 2 species, Hydropphilidae comprising of 4 species and Dytiscidae comprising of 5 species. Highest number of species belongs to the family Dytiscidae. The aquatic coleopterans were mostly abundant during the Post monsoon season and lowest during the monsoon season. It was observed that most of the aquatic Coleoptera were associated with different parts of hydrophytes of the Beel.
