658 | REPTILES—EMYDIDAZA. 
KEY TO GENERA OF EMYDIDA. 
* Upper jaw notched anteriorly. a. 
* Upper jaw not notched anteriorly, or with only asinuous indentation. bd. 
a, Carapax not carinate. 6. 
a, Carapax carinate. 5 ‘ : , : : CHELOPUS. 
b. Vertebral keel persistent in the nant: beer jaw with a spoon-shaped 
dilatation. “4 : : : 6 : : : ; GRAPTEMYS. 
b. Vertebral line in adult tuberculated ; horny sheath of jaws straight; extra- 
limital. sae . : : ; .  * MALACOCLEMMYsS, 
e. Carapax considerably arched, and usually more or less spotted on the 
vertebral and costal plates. 4d. 
e. Carapax depressed ; vertebral and costal plates not spotted. e. 
d. Plastron without a movable transverse hinge; costal and vertebral 
plates with isolated, round, nonconfluent yellow spots. ... NANEMYS. 
d. Plastron with a movable transverse suture; vertebral, and usually the 
costal plates, without round yellow spots. . : d .  EmMys. 
é. Alveolar surface of jaw not divided by a longitudinal ridge; neck, legs 
and tail often with bright red stripes. . : 5 . CHRYSEMYS. 
6. Alveolar surface of jaw with aridge parallel to cutting edge ; no scarlet 
Stripes. : : . : 6 : j : . PSEUDEMYS. 
GENUS CHELOPUS. Rafinesque. 
Upper jaw with a distinct notch anteriorly; lower jaw straight except at tip, or 
arched upward; horizontal alveolar surface narrow ; sides of head compressed ; plastron 
immovably soldered together and to the carapax; head compressed laterally ; carapax 
elongated, considerably arched, and provided with a keel. 
* A dark orange blotch on each side of the neck extending over the temporal muscles ; 
extralimital, New York, New Jersey, and Pennsylvania. . tC. MUHLENBERGI. 
* Sides of neck without such spots. 6 6 : : : : C. INSCULPTUS. 
CHELOPUS INSCULPrUS LeConie. 
Sculpiured Tortoise. 
Testudo insculptus, LECONTE, HARLAN. 
Emys scabra, SAY. 
Emys insculptus, LECONTE, HOLBROOK, DEKAY, STORER. 
Emys pulchella, DUMERIL and BIBRON. 
Emys speciosa, GRAY. 
Glyptemys insculptus, AGASSIZ, VERRILL, ALLEN. 
Chelopus insculptus, CopE, JORDON. 
"One species Malacoclemmys palustris (mys palustris, et terrapin, DeKay), Agassiz’s 
Cont., i, p. 437; Holbrook’s N. A. Herp., i, p. &7; DeKay’s Rept. N. Y., p. 10, ranges 
along the Atlantic coast, in salt marshes, from New York to Texas and South America. 
t Agassiz’sa Cont., i, p. 443; Helbrook’s N. A. Herp., i, p. 45; DeKay’s Rept., p. 17. 
