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 Elapidae (terrestrial species) Key to Philippine genera. 1a. Three postocular scales ( Fig. 17A–B ); lateral body scales in oblique or horizontal rows ( Fig. 15 ).................................................................... 2 1b. Two postocular scales ( Fig. 17C–D ); lateral body scales in horizontal rows ( Fig. 15B ); number of longitudinal rows of dorsal body scales not reducing posteriorly..................... 3 2a. Dorsal body scales in 17–25 longitudinal rows at midbody; postnasal scale vertically elongate, separated from or only narrowly in contact with prefrontal scale ( Fig. 17A )..... Naja (p. 30) 2b. Dorsal body scales in 15 longitudinal rows throughout length of body; postnasal scale triangular, about as long as tall, and broadly in contact with prefrontal scale ( Fig. 17B )....................................................................... Ophiophagus (p. 31) FIGURE 17. Lateral view of head of (A) Naja samarensis (KU 326653), (B) Ophiophagus hannah (KU 321813), (C) Hemibungarus mcclungi (KU 313898), (D) Calliophis philippina (KU 327218). Postocular scales (green), anterior temporal scales (purplish-gray), postnasal scales (blue), prefrontal scales (reddish brown). 3a. Two anterior temporal scales ( Fig. 17C ); dorsal body scales in 15 longitudinal rows throughout length of body.............................................. Hemibungarus (p. 24) 3b. One anterior temporal scale ( Fig. 17D ); dorsal body scales in 13 longitudinal rows throughout length of body.................................................. Calliophis (p. 21)