Fig. 1. Ranges of three subspecies of T. sirtalis in Canada. Areas of horizontal lines are the six regions which were treated as separate samples. Bands of small dots are areas of intergradation. Triangle depicts the type locality of pallidula and the spot marks source of the plesiotype. Fig. 2. "A" Is the Plesiotype of T. s. pallidula with a Section of Stretched Skin Showing the Pigment Pattern of the Scales and Skin. "B" Is a Typical T. s. sirtalis from Eastern Ontario.
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