Illustrated Key to the Snakes of the Philippines Author Weinell, Jeffrey L. Department of Ecology and Evolutionary Biology and Biodiversity Institute, University of Kansas, Lawrence, Kansas 66045; jweine2@gmail.com Author Hooper, Errol Department of Ecology and Evolutionary Biology and Biodiversity Institute, University of Kansas, Lawrence, Kansas 66045; Author Leviton, Alan E. Herpetology Division, Institute of Biodiversity Science & Sustainability, California Academy of Sciences, 55 Music Concourse Drive, San Francisco, California 94118. * Corresponding author; Email: jweine 2 @ gmail. com Author Brown, Rafe M. Department of Ecology and Evolutionary Biology and Biodiversity Institute, University of Kansas, Lawrence, Kansas 66045; text Proceedings of the California Academy of Sciences 2019 2019-09-30 66 1 1 49 journal article 299708 10.5281/zenodo.11512680 ccd739a4-10c3-4700-b27e-459bd82f1676 0068-547X 11512680 Natricinae Key to Philippine genera. 1a. Fewer than 10 supralabial scales................................................ 2 1b. More than 10 supralabial scales................................. Opisthotropis (p. 31) 2a. One of the following combinations of characters true: (1) dorsal body scales in 15–17 longitudinal rows at midbody and background color of ventral body scales black; (2) dorsal body scales in 19 longitudinal rows at midbody and background color of ventral body scales pale (but not pinkish) in life................................................ Rhabdophis (p. 33) 2b. One of the following combinations of characters true: (1) dorsal body scales in 17 longitudinal rows at midbody and background color of ventral body scales pale; (2) dorsal body scales in 19 longitudinal rows at midbody and background color of ventral body scales pinkish in life.............................................................. Tropidonophis (p. 35)