provinces of Loja and Zamora-Chinchipe at elevations of 2100-2250 m. B. marajoensis Hoge, 1966 0 Marajó lancehead Northern Brazil in the coastal lowlands of the Amazon Delta. B. microphthalmus Cope , 1875 0 Small-eyed toadheaded pitviper Amazonian slopes and lowlands of Colombia, Ecuador, Peru and Bolivia. B. moojeni Hoge, 1966 0