FIGURE 37 in Illustrated Key to the Snakes of the Philippines

FIGURE 37. Dorsal view of head of (A) Hydrophis peronii (CAS 136104; a redrafting by EH of original image in Leviton et al. 2014), (B) Hydrophis melanocephalus (KU 94556). Frontal scales (green), parietal scales (purplish-gray). Fig. A reproduced and modified with permission of A. Leviton and the Calfornia Academy of Sciences.