@misc{indiciaed8609fa1eff7,
  title = {A new water snake from Mexico, with notes on anal plates and apical pits in Natrix and Thamnophis — Illustration, Page 13},
  year = {1961},
  url = {https://www.biodiversitylibrary.org/page/63000708},
  note = {Source identifier: page-63000708}
}