Fig. 11 a–d in Not withering on the evolutionary vine: systematic revision of the Brown Vine Snake (Reptilia: Squamata: Oxybelis) from its northern distribution

Fig. 11 a–d Holotype of Oxybelis potosiensis Taylor 1941 (UIMNH 25069) from San Luis Potosí, Mexico; a whole specimen; b the crown, note the lack of a constriction anterior to the eyes, rostral not visible from above, and the relatively broad snout; c the profile; d arrangement of the chin shields