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Twenty-six Amphibia (plus two possible) and 45 Reptilia have been recorded in SE Senegal; 23 Amphibia (plus three probable) and 39 Reptilia (plus five probable) are listed for the Niokola-Koba National Park. New country records made in October 1996 were Amphibia: Kassina fuscaSchiøtz 1967; and Reptilia: Agama sankaranicaChabanaud 1918, Cophoscincopuscf.greeri, Mabuya quinque-taeniata scharica Sternfeld 1917 and Chalcides thierryi pulchellusMocquard 1906, with extended ranges for Bufo maculatusHallowell 1854 and Phrynomantis micropsPeters 1875. CophoscincopusMertens 1934 is a genus new to Senegal. Relative density of diurnal woodland lizards was nearly 4-fold that of bushland and thicket lizards of drier northern and western Senegal. Where riparian forest habitat formed within undifferentiated Sudanian woodland, reptile species differed and diversity was lower. Percentage frequency of woodland A. sankaranicawas reduced by man-made road structures, while Agama agamaLinnaeus 1758 and Hemidactylus brookicomplex were only recorded with them. Geckos were not recorded inside the boundary of the Niokola-Koba National Park (baboons and patas monkeys abundant), and diversity was reduced; outside, reptile density was nearly 5-fold, with geckos (Tarentola parvicarinataJoger 1980 and H. brookicomplex) predominant. Faunal overlap of lizards in SE Senegal with those of W Mali—the same area of endemism—was higher than with species in northern and western Senegal.