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 Calliophis Key to Philippine species. 1a. Dorsal body surface with black and white crossbands, rather than longitudinal stripes; head black dorsally; tail red dorsally.................................... Calliophis salitan 1b. Dorsal body surface with pale longitudinal stripes, rather than crossbands............... 2 2a. Black bands on ventral body surface not in contact with black of lateral body surface; distinct white longitudinal stripe present on lateral body surface, occupying entire first, or parts of first and second, dorsal body scale rows............................... Calliophis bilineata 2b. Black bands on ventral body surface in contact with black of lateral body surface; distinct white stripe absent from first or second dorsal body scale rows............................. 3 3a. Cream-colored bands on ventral body surface do not extend onto side of body above first dorsal body scale row............................................. Calliophis suluensis 3b. Cream-colored bands on ventral body surface extend onto side of body, often to fourth dorsal body scale row............................................... Calliophis philippina