Calliophis, Gray, 1835

Weinell, Jeffrey L., Hooper, Errol, Leviton, Alan E. & Brown, Rafe M., 2019, Illustrated Key to the Snakes of the Philippines, Proceedings of the California Academy of Sciences 66 (1), pp. 1-49 : 21

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