In this book, compiles information on the moths of Bihar and Jharkhand, two states in eastern India. The research programme was originally approved as "Taxonomic studies on family Noctuidae from Bihar and Jharkhand". But due to the lack of any consolidated data, coupled with the immense economic importance of these moths, an effort has been done to collect and identify as many moth species form the area under study as possible. Besides fresh collections, the moth collections preserved (till 2013) in the National Zoological Collections of ZSI, GPRC, Patna are also included. This helped in the compilation of information on the morphotaxonomy of 201 species under 140 genera, 35 subfamilies and 18 families of moths from Bihar and Jharkhand. Five new species are described in this treatise besides many new records and combination.