A CONTRIBUTION TO THE HERPETOLOGY OF THE ISTHMUS OF TEHUANTEPEC 111. THREE NEW SNAKES FROM THE PACIFIC SLOPE

WHILE collecting reptiles and amphibians in the vicinity of the village of Tehuantepec, Oaxaca, during the suinmer of 1936, we made several visits to a pond soine three miles northeast of the village. By far the most coiispicnous reptilian inhabitant of this pond was a garter snalre of the radix group which we believe to represent an undescribecl species. Our great ad-miration for A. G. Rnthven's (1908) coiltribution to the lrnowledge of systematics, especially that of the garter snakes, prompts us to name the form Thamnophis ruthveni, 11. sp. HOLOTYPE.-U.M.M.Z. NO. 82469; male, collected by Norman I-Iartweg and James Oliver in a se~nipermanent pond about three i~iiles northeast of Tehuantepec, Oaxaca, July 5, 1936. PARATYPES.-U.M.M.Z. NOS. 82470-82510, all from the vicin-ity of Tehuantepec