Kinosternon suhruhrum suhrubrum (Laccpede) Common Mud 



Turtle 

 (Cinosternum pennsylvanicum (Gmelin) ) 

 Top of head plain dark or dark mottled 17. 



17. Carapace without lengthwise keels; top of head dark; sides and under 



surface of head plain yellow; Neb. to Texas and Ariz,.; also 111. 



Kmosternon fiavescens (Agassiz) Yellow-necked Mud Turtle 

 Carapace with three more or less distinct lengthwise keels; top of head 

 dark mottled; under surface of head mottled dark and light; Texas to 

 Cal. 



Kinosternon sonoriense Le Conte Arizona Mud Turtle 

 (Cmosternum henrici Le Conte) 



18. Carapace and plastron united by a cartilaginous joint; with a transverse 



hinge across the plastron between the abdominal and pectoral plates 

 The Box Turtles 19. 



Carapace and plastron united by a bony bridge; no hinge across the plas- 

 tron in this region 24. 



19. Posterior margin of plastron and the upper jaw notched; carapace long- 



oval, black with yellow spots; Minn, and Iowa to New England 

 Emys hlandmgii (Holbrook) Blanding's Semi-box Turtle 

 (Emys meleagns (Shaw and Nodder) ) 

 Posterior margin of plastron straight or outcurved; upper jaw hooked 

 color of carapace variable 20 



20. Usually, but not always, wth three claws on the hind foot; no webs be 



tween the toes 2 1 



Usually with four claws on the hind foot; toes somewhat webbed 22 



21. Shell flaring outwards behind; with orange markings around mouth and 



chin; carapace with variable, obscure, yellowish markings; plastron 

 yellow, sometimes with dark clouding; S. C. to Texas, north to Mis- 

 souri 



Terrapene triunguis (Agassiz) Three-toed Box Turtle 

 Shell very globular and not flaring much behind; with two yellow bands 

 behind each eye; chin yellow; plates of carapace with greenish lines in 

 a fan-like pattern; plastron plain yellow or with dark cross markings; 

 Florida 



Terrapene hauri Taylor Baur's Box Turtle 



22. Toes scarcely webbed, the claws appearing to spring almost directly 



from a fleshy foot; plastron dark, with bright yellow stripes and bars; 

 plates of carapace v.'ith yellow stripes in a fan-like pattern; Mont, to 

 Ind. and Arizona 



Terrapene ornata (Agassiz) Painted Box Turtle 

 (Cistudo ornata Agassiz) 

 Toes about half or more webbed; plastron yellow or with dark blotches 

 or clouding 23. 



23. Carapace plain or with yellow markings arranged in radiating lines; plas- 



tron mostly yellow, with the edges of the plates tinged with dark; toes 

 of hind feet deeply webbed; shell elongated; Ga. to Fla. and Texas 

 Terrapene major (Agassiz) Large Box Turtle 

 (CiStudo major Agassiz) 



433 



