LIZARDS, TORTOISES AND BATRACHIANS 393 



4 Kinosternun pennsylvanicum Bosc 

 Mud tortoise 

 De Kay. K. p ennsy 1 vani cum, p. 21, pi. 3, flg. 4 

 Shell dusky brown ; head dark, with light dots. Differs from the 

 following species in that the plastron is divided into two parts, so that 

 the animal can shut itself up almost completely. Length 4 inches. 

 Rare but may be taken in southern part of the state* Fre- 

 quently found on land. 



5 Aramochelys odorata Latreille 



Musk twrtle, stink pot 



De Kay. S t erno thaerus odoratiis, p. 23, pi. 7, fig. 13 



Shell dusky, sometimes spotted, usually covered with mud and 



green algae ; neck with two yellow stripes ; plastron cross-shaped, 



somewliat like Chelydra but larger ; head large, jaws strong, 



odor strong musky. 



Found in ponds and ditches all over the state. Is a nuisance to 

 fishermen, whose hooks it takes. 



Family 4 bmydidae 

 Pond turtles 

 Carapace ovate, broadest behind, the margins having a tendency 

 to flare outward ; plastron covering entire ventral surface, its plates 

 12 in number. 



6 Graptemys geographicus Le Sueur 

 Map turtle 

 De Kay. Emys geographlca. The geographic tortoise, p. 18, pi. 4, flg. 7 

 Dark olive brown with network of greenish or yellow lines, more 

 prominent on edges of carapace ; head and neck also with yellow 

 stripes ; plastron yellowish ; carapace notched behind and keeled. 

 Found in streams in western part of state. 



7 Graptemys pseudogeographicus Holbrook 



De Kay. Emys pseudogeographicus, the pseudo geographic tortoise, 



p. 19, pi. 3, fig. 3 

 Much like preceding but browner, the markings on the shell pale 

 and in larger pattern ; keel of carapace stronger, back of each plate in 

 the middle line projects over succeeding one ; plastron yellowisli, mar- 

 bled with reddish brown ; head and legs with bright yellow stripes. 



