84 TESTUDINID^. 



nor hooked, the edge not or but sliglitly denticulated ; calveolar 

 surface of upper jaw very broad all round, with a very strong, 

 tuberculate or coarsely serrated median ridge ; lower jaw very flat, 

 with a shar]) jioint in front, the edge serrated ; the width of the 

 man(lil)le at the symphysis is much less than the horizontal diameter of 

 the orbit. Digits very broadly webbed ; claws very long in the males. 

 Tail short. Carapace olive or brown, variegated with yellowish 

 dark-edged lines sometimes forming a reticulate pattern ; i)lastron 

 yellow, uniform or with a few dark spots or symmetrical markings. 

 Head with orange or red streaks, the broadest of which runs from 

 the upi)er border of the orbit to the neck ; chin and throat witli a 

 few orange streaks, the median bifurcating behind the mandibular 

 symi)hysis. 



Length of shell 40 centira. 



South-eastern North America, from Missouri and North Carolina 

 to the Gulf of Mexico. 



a. Yg., spir. Pilatka, Florida. Smithsonian Instit. 



b. $, stffd. Louisiana. W. 1'. Smith [C.]. 



c. (I. cJ ifc yrr.j stilil. Loiusiana. 



e. Yg., spir. N. America. (Type of Emys annuUfera.) 



f, ff, h, i. 2 J stifd. N. America. 

 k. 2 J skel. N. America. 



11. Chrysemys rubriventris. 



Emys sorrata («o« Davd.), Say, Jotirn. Ac. TMlad. iv. p. 204 (1825); 



Gray, Syn. Hcpt. p. 29 (1831), cmd Cat. Tort. p. 21 (1844). 

 Testudo rubrivontris, Lcconte, Avn. Lye. N. Y. iii. p. 101 (1830). 

 Terrapene rubriventris, Bonap. Osserv. s. sec. Ed. Ji. A. p. 154 



(1830). 

 Emys irrigata, Dum. 8f Bibr. ii. p. 27G (1835). 

 rubriventris, Dmn. ^- Bibr. t. c. p. 281 ; Ilolhr. N. Am. Ilcrp. 



ii. p. 55, pi. vi. (It42); Dvhay, Faun. N. Y., Bent. p. IG, pi. vii. 



fig. 14 (1842). 



rivulata, Gray, Cat. Tort. p. 22 (1844), and Cat. Sh. Bept. i. 



p. 27, pi. xi. (1855). 



nigosa, Leconte, Bruc. Ac. Bhilad. 1854, p. 189. 



Pseudcniys serrata. Gray, Sh. Bept. i. p. 34, and Suppf. p- 46 (1870). 

 Ptychemys rugosa, Ayass. Contr. N. H. U. S. i. p. 431, pis. xxvi. & 



xxvii. Q857). 

 Clemmys rugosa, Straach, Chelon. Stud. p. 33 (1862). 



rubriventris, Stravc/i, Verth. Schildhr. p. 80 (18C5). 



Pseudemys rugosa, Cope, Check-List K.Am. Bept. p. 52 (1875). 



Very closely allied to the preceding, but carapace more elongate 

 and somewhat constricted at the sides in the adult. Both jaws 

 strongly and coarsely serrated, upper notched mesially, with a cusp 

 on each side. Colour of carapace very variable, sometimes very 

 similar to that of C. concinna, often reddisli with a black network ; 

 plastron yellow, w^th black blotches or symmetrical markings in the 

 young, reddish or red in the adult. 



Length of shell 27 ccntim. 



