6. CHRTSTiMTS. 83 



snout pointed and strongly projecting:, the nostrils pierced below the 

 end of the snout ; median rn\g;e of upper alveolar surface stronger 

 and denticulaled. Carapace l)ro\vn ; an oval dark spot, surrounded 

 by a light ring in the postero-proxinial part of each costal shield, 

 close to the vertebral; plastron marbled or blotched \villi dark 

 brown ; a broad dark brown band across the bridge. Tlie longi- 

 tudinal bands on the head less numerous and less distinct. 

 West coast of Central America. 



a. J , shell, and soft Tapana, Tehuantepec. F. Sumichrast [C.]. O- 

 parts in spirit. Salvin Sc ¥. 1). (tod- 

 man, Ki^qs. [P.]. 



b, c. Ad., shells, Tapana, Tehuantepec. F. Suiiiichra.st [C.l. O. 



Salvin & F. D. God- 

 man, Esqs. [1^1. 



(J, e. 5,stthL Sao MateO; Tehuantepec. F. Snmichrast [C.]. 



/. J , stlld. Mexico. 



10. Chrysemys concinna. 



Emys reticularia {non Daud.), Say, Joiirn. Ac. Thilad. iv. p. L'04 



(182.5). 

 Testndo tloridana, Lcconte, Ann. Lye. N. Y. iii. p. 100 (IS.'^O). 



concinna, Lcconfe, I. r. p. ]0(). 



Terrapene tloridana, Bonap. Oasv/t. s.sec. F.d. d. It. A. p. 154 (1830). 



concinna, Bonap. I. c. p. loO. 



Emjs annuhfera, (irai/, Syn. liept. p. 32 (1831), nnd Cat. Tort. 



p' 28 (1S44), (Did Sh. liept. i. p. 27 (1855). 

 tloridana, Bum. ^ Bihr. ii. p. 285 (1835) ; IMbr. N. Am. 



Hevp. i. p. 65, pi. viii. (1842) ; Gray, Cat. Tort. p. 20, and Sh. 



Rept. i. p. 27. 



concinna, Dum. 8f Bibr. ii. p. 289; Holbr. I. c. p. 110, pi. xix. ; 



Gray, Cat. Tort. p. 25. 

 Pseudemys concinna, Gray, Cat. Sh. liepf. i. p. 34, and Siippl. p. 47 



(1870)."' 

 Ptychemys concinna, Agassiz, Contr. N. II. U. S. i. p. 432, pi. i, 



tig. 13, & pi. ii. figs. 4-6 (1857). 

 Clemmys concinna, Strauch, Chehn. Stud. p. 32 (18G2), and Verth. 



Schiidhr. p. 76 (1805). 



fluridana, Strauch, Chehm. Stud. p. 32. 



Emys orthonvx, }]'ied, N. Acta Ac. Leop.-Carol. xxxii. i. p. 23, 



pi. iii. (180o). 

 Trachemys anuulifera, Gray, Hand-List Sh. Bept. p. 47 (1S73). 



Carapace moderately depressed, unicarinate in the young, longi- 

 tudinally rugose in the adult ; nuchal narrow ; first vertebral with 

 sinuous lateral borders, not broader in front than behind, and 

 frequently narrower ; second and third vertebrals as long as broad, 

 or a little'longer than broad, in the adult, narrower than the costals ; 

 posterior marginals not or but very slightly notched. Hind lobe of 

 plastron notched, its width not one third that of the carapace ; its 

 length about equals the width of the bridge ; the longest median 

 suture is that between the abdominal shields, the shortest that be- 

 tween the humerals ; inguinal and axillary large. Head moderate ; 

 snout very short, not projecting ; upper jnw not distinctly notched 



H 



