REPTILES 231 



d2 Alveolar surfaces of jaws with a longitudinal ridge; 



upper jaw notched in front; carapace not keeled 7. Pseudemys. 



C2 Alveolar surfaces of jaws narrow, 

 di Hind feet largest, broadly webbed. 



ei Marginal shields with red markings 6. Clirysemys. 



e2 Marginal shields without red markings 8. Deirochelys. 



da Hind feet not larger, slightly webbed i. Clemmys. 



b2 Plastron with hinge across the middle, enabUng the animal to 

 close its shell. 

 Ci Body depressed; plastron notched behind; upper jaw 



notched in front 2. Emys. 



Co Body arched; plastron rounded or truncate behind; upper 



jaw hooked in front 3- Terrapene. 



ao Digits club-shaped, being closely bound together, only the last 



joint being free; southern States 9. Gophenis. 



I. Clemmys Ritgen. Wood-tortoises. Small ttirtles with usually 

 a depressed carapace with a more or less prominent keel; plastron joined 

 with the carapace by a wide rigid bridge; feet more or less webbed: 

 4 United States species. 



Key to the Species of Clemmys 



ai In the eastern and central States. 



bi Carapace smooth with small yellow spots on a black back- 

 ground C guttata. 



hi Carapace with deep concentric grooves in each plate and 



serrated behind; color uniform brown C. insculpta. 



hi Head with a large yellow or orange spot on each side C. muhlenbergii. 



a.1 On the Pacific slope C. marmorata. 



C. guttata (Schneider). Spotted turtle (Fig. 131). Body black 

 above, with numerous small round orange or yellow spots; plastron 



Fig. 131. — Clemmys gutlala {from Fowler). 



black, blotched with yellow or orange; carapace smooth, without 

 keel, 100 mm. long and 75 mm. wide: eastern States; southward along 



