FIGURE 2. Schematic of a typical Stegonotus head (specifically, the head of the holotype of S. ayamaru, RMNH.RENA 31199) to illustrate the head-scale pattern and some character definitions. (A) Dorsal view. Labeled head scales include internasals (IN), prefrontals (PF), frontal (F), supraoculars (SO), and parietals (P). Numbered points include (1) the anterior contact point of the internasals; (2) the posterior contact point of the internasals; (3) the anterior contact point of the prefrontals; (4) the posterior contact point of the prefrontals; (5) the posteriormost point of the frontal, where the posterior edge of the frontal meets the parietal suture; (6) the two points where frontal, parietal, and supraorbital meet; and (7) the two points where parietal, supraorbital, and postorbital meet. Our measurements of internasal suture lengths are taken as the straight-line distance from Point 1 to Point 2, of prefrontal suture lengths from Point 3 to Point 4. The posterior frontal angle (PF<) is defined by a ... : Published as part of Kaiser, Christine M., Lapin, Jack, O'Shea, Mark & Kaiser, Hinrich, 2020, Carefully examining Bornean Stegonotus (Serpentes, Colubridae): the montane groundsnake population in Sabah is a new and distinct species, pp. 53-68 in Zootaxa 4894 (1) on page 57, DOI: 10.11646/zootaxa.4894.1.2, http://zenodo.org/record/4315464 ...