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 Oxyrhabdium Key to Philippine species. 1a. Loreal scale separated from or in contact with second supralabial scale; if loreal scale in contact with second supralabial scale, their length of contact is less than half the length of the contact between loreal and postnasal scales ( Fig. 42A ); usually eight supralabial scales (rarely seven), with fifth and six (rarely fourth and fifth) supralabial scales bordering eye ( Fig. 42A ); dorsal surfaces of head, body, and tail brown or reddish-brown in color; juveniles have distinct white nuchal collar, but lack light crossbands on other parts of the body............................................................... Oxyrhabdium modestum 1b. Length of contact between loreal scale and second supralabial scale similar to length of contact between loreal scale and postnasal scale ( Fig. 42B ); seven supralabial scales, with fourth and fifth supralabial scales bordering eye ( Fig. 42B ); dorsal surfaces of head, body, and tail dark gray or olive in color; juveniles have distinct white nuchal collar plus light crossbands on other parts of body and tail; pale crossbands may be faintly visible in adults....................... 2 FIGURE 42. Lateral view of head of (A) Oxyrhabdium modestum (KU 311301), (B) Oxyrhabdium leporinum leporinum (KU 322335). Loreal scale (green), postnasal scale (blue), second supralabial scale (purplish-gray). 2a. Adult dorsal color pattern uniform (lacking pale crossbands); number of ventral body scales + subcaudal scales 192–230.......................... Oxyrhabdium leporinum leporinum 2b. Adults and juveniles with narrow white dorsal body crossbands and white nuchal collar; number of ventral body scales + subcaudal scales 221–235... Oxyrhabdium leporinum visayanum