FIGURE 1 in Patterns of head shape and scutellation in Drymarchon couperi (Squamata: Colubridae) reveal a single species

FIGURE 1. Head scale patterns in Eastern Indigo Snakes (Drymarchon couperi). A) 2+2 condition of temporals (I = dorsal anterior temporal; II = ventral anterior temporal; III = dorsal posterior temporal; IV = ventral posterior temporal) and position of 4th, 5th, 6th, and 7th infralabials; dashed lines represent linear measurements described in the text; B) 3v+2 condition of temporals (extra ventral temporal shaded); C) 4+2 condition of temporals (extra dorsal and ventral temporal shaded); D) 3d+2 condition of temporals (extra dorsal temporal shaded).