First Record of Two Species of Cybister Curtis, 1827 (Coleoptera: Dytiscidae) from Arunachal Pradesh, India

Dytiscidae are a moderately large family, commonly known as predacious diving beetles. They have unique swimming method. As a whole dytiscid beetles of Arunachal Pradesh as well as those from North-East India are still poorly known though the region is well known for its rich faunal diversity. Of the dytiscid known from India (currently more than 251 species), only 14 species have been reported from Arunachal Pradesh (Ghosh & Nilsson, 2012) which highlight the low level of studies of the family in the state which is located in one of the global biodiversity hotspot.