FIGURE 6 in Illustrated Key to the Snakes of the Philippines

FIGURE 6. Lateral view of head of (A) Gerrhopilus hedraeus (CAS-SUR 12346; a redrafting by EH of original image in Savage 1950); (B) Malayotyphlops luzonensis (CM 2653; a redrafting by EH of original image in Wynn et al. 2016); (C) Malayotyphlops denrorum (PNM 9813; a redrafting by EH of original image in Wynn et al. 2016). Preocular scale (green), second supralabial scale (purplish-gray). Fig. A reproduced and modified with permission of J.M. Savage; Figs.B-C reproduced and modified with permission of A. Wynn and Journal of Herpetology.