A revision of the South American snake genus Thamnodynastes Wagler, 1830 (Serpentes, Colubridae, Tachymenini). I. Two new species of Thamnodynastes from Central Brazil and adjacent areas, with a redefinition of and neotype designation for Thamnodynastes pallidus (Linnaeus, 1758). Phyllomedusa, 4(2), December 2005: 83-101. 93 [Zoological Record Volume 142]