B. No coronoid bone; nasals isolated.
1. Maxillary elongate, not movable vertically.
a. Maxillary half as long as mandible.
Supratemporal half as long as skull, projecting far beyond cranium; mandible much longer than skull
Tropidonotus.
Supratemporal not half as long as skull, projecting far beyond cranium; mandible much longer than skull
Zamenis.
Fig. 8—Skull of Coluber longissimus. (From British Museum Catalogue of Snakes)