Gans, Carl, 1923-Diefenbach, Carlos Olegario da C.2005-10-062005-10-061972http://hdl.handle.net/2246/270120 p. : ill., maps ; 24 cm.Includes bibliographical references (p. 19-20)."The species Amphisbaena angustifrons Cope is reappraised on the basis of new specimens from southern South America. Amphisbaena plumbea Gray is treated as a race of angustifrons because of the occurrence of specimens from La Pampa, Argentina, intermediate in character pattern"--P. [1].3266606 bytesapplication/pdfen-USAmphisbaena angustifronsAmphisbaena angustifrons -- Variation.Reptiles -- ArgentinaReptiles -- Variation -- Argentina.text