Fig. 16 in Observations on Garter Snakes of the Thamnophis eques Complex in the Lakes of Mexico's Transvolcanic Belt, with Descriptions of New Taxa

Fig. 16. The Lago de Magdalena, Jalisco, when it was considerably larger and extended to La Quemada. Adapted by W.H. Brandenburg from Mexican CETENAL topographic maps of 1973 showing low flat areas that at one time were presumably occupied by the lake.