140 



(F) Shell low, never keeled; toes strong, broadly webbed; hind 

 feet much larger. Genus Chrysemys. The Painted Turtles. 



(G) Plates of carapace in straight rows across back. Sp. 12. 

 Chrysemys picta. Painted Turtle. 



(GG) Plates of carapace alternating, so that the two side rows 

 are not in line with the middle one across back. Sp. 13. Chrysemys 

 marginata. Margined Turtle. 



(FF) Carapace much arched; feet nearly equal in size; toes 

 narrowly webbed. Genus Clemmys. 



(H) Carapace usually more or less keeled, upper jaw deeply 

 notched and edge strongly arched downward. 



(I) Head not notably narrower below than above. Sp. 14. 

 Clemmys muhlenbergi. Muhlenberg's Turtle. 



(II) Head decidedly narrower below than above. Sp. 15. 

 Clemmys insculptus. Wood Turtle. 



(HH) Carapace not keeled; tipper jaw but slightly notched, its 

 edge nearly straight. Sp. 16. Clemmys guttatus. Speckled Turtle. 



(AA) Plastron or lower shell with a movable hinge across its 

 middle. 



(J) Body depressed or flattened; plasteron notched behind; toes 

 well webbed, aquatic. Genus Emydoidea. Sp. 17. Emydoidea 

 blandingi. Blanding's Turtle. 



(JJ) Body short, high and well arched; plastron rounded or 

 squarely cut ofif but not notched behind; toes scarcely webbed, not 

 aquatic. Genus Terrapene. Sp. 18. Terrapene Carolina. Common 

 Box Turtle. 



Species 7. Graptemys geographicus (Le Sueur). The Map Tlirtle. 

 [Malacoclemmys geographicus (Le Sueur).] 



The Map Turtle has been designated the Geographic Tortoise, the 

 Map Tortoise, the Geographic Terrapin and the Lake Erie Tortoise. 

 It is interesting to note that the last name was used by Baron 

 Cuvier in 1831, Vol. IX, page 75. 



It is described as follows : 



Carapace ovate, not strongly convex, margin flaring out, median 

 keel present, but dull; margin strongly notched behind; plastron 

 fixed, notched behind, covering whole under surface. Upper jaw 

 not notched, crushing surface smooth. Toes broadly webbed. Plas- 

 tron yellowish, carapace, dark olive brown, with greenish and yel- 

 lowish streaks and reticulations on edges; neck and legs similarly 

 marked; plates of carapace scarcely oyerlaping. The miirginal 

 shields underneath gbow roooded marks within rounded xn&vks, of 



