Abstract
Two new species of the skates, Bathyraja hubbsi and B.pseudoisotrachys are described from the North Pacific.Among the North Pacific Bathyraja, B.hubbsi most closely resembles B.violacea Suvorov in possessing a disc without thorns, a median tail thorns irregularly spaced, and minute fine prickles covering the entire dorsal surface.The two species are distinguished from each other by their dorsal color pattern, proportional measurement of tail in relation to total length, clasper components, and number of precaudal vertebrae.Bathyraja pseudoisotrachys has long been confused with B.isotrachys (Günther) by many Japanese authors, but is distinguished from other North Pacific Bathyraja by dorsal squamation and unique clasper components such as two clefts, terminal bridge and ridge.Bathyraja kincaidii Garman is synonymized with the validspecies B.interrupta Gill et Townsend.Bathyraja abyssicola Gilbert and B.trachura Gilbert are redescribed in detail.Provisionally, 21 species of the genus Bathyraja are recognized in the present study from this region, and a revised key is given to the North Pacific species of the genus .
