Sibynophis (Gaulke, 1993)

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 : 34

Sibynophis

Key to Philippine species and subspecies.

1a. Pale interocular bar present; usually eight (rarely nine) supralabial scales........................................................................... Sibynophis bivittatus

1b. Pale interocular bar absent; usually nine (rarely eight) supralabial scales.................................................................. Sibynophis geminatus geminatus