The Arizona treefrog is a small 1.8 inches (4.6 centimeters) green frog with a dark eyestripe that extends past the shoulder onto the side of the body, and sometimes to the groin area (Figure 1). This dark stripe may break into spots or dashes past the shoulder. The eyestripe on the similar Pacific treefrog (Pseudacris regilla Complex), a complex of three species from the Pacific Coast region, does not extend past the shoulder. Some Arizona treefrogs exhibit dark spots on the head and upper back, and bars or spots on the lower back. The throat of the male is dusky green or tan, and males average a slightly smaller size than females (Duellman 2001, pp. 983-985; Stebbins 2003, p. 224).