BATEACHIANS AND REPTILES, CENTRAL AMERICA AND MEXICO. 23 



CiNOSTERNUM iiiRTiPES Wagler, Descr. aud Icones Amphib., 17, 1833, pi. xxx; Dum. 

 et Bibr., Erp. Gdn,, t. ii, p. 370; Bocourt, Miss. Sci. au Mex., iii, p. 25; C. henrici 

 Leconte, Proc. Acad. Phila., 1859, 4 ; Cope and Yarrow in Report U. S. G. G. Survey 

 W. of 100th Mer., v. Zocil., p. 583, t. 16. 

 City of Chihuahua, WilMnson ; Guanajuato, Dugcs ; Colima, Xantus ; Mazatlau and 

 Tres Marias Id., Forrer. 



CiNOSTERNUM INTEGRUM Lecoute, Proc. Acad. Phila., 1854, p. 183; GUnther, Biologia 

 Centr. Amer. Zool., Reptiles, p. 1(5. 

 " Mexico,"? Vera Cruz, Pease. 



CiNOSTERNUM EFFELDTii Peters, Mon. Ber. Akad. Berlin, 1873, p. 603 ; Giinther, Biol. 

 Centr. Amer. Rept., p. 16. f C. herendtianum Cope, Proceeds. Acad. Phila., 1865, 189. 

 Vera Cruz, Peters. 



CiNOSTERNUM BREViGULARE GUuther, Biol, Ceutr. Amer., Reptiles, p. 17, pi. xviii, f. A., 

 May, 1885. 

 Playa Viceutd, SalU. 



CiNOSTERNUM POSTINGUINALE Co\}e, Cinostemum leucostomum " Dum.," Cope Journ. 

 Acad. Phila., 1875,153, nee Dumerilii. Cinostermtm Irevlgulare, Cope, Proc. Amer. 

 Philos. Soc, 1885, June, p, 389, nee Giintheri, supra. 

 E. coast Costa Rica, Gahh. 



CiNOSTERNUM COBANUM Giinther, Biol. Centr. Amer. Zool., Rept., p. 18, tab. xviii B.; 

 Guatemala, Salvin ; Cababon, Sarg. 



Staurotypus Wagler. 



Nat. Syst. Amphib., 137, 1830. 



Staurotypus triporcatus Wagler, Dum. et Bibr. Erp. G6n., t. ii, p. 356. 

 East coast of Mexico ; Tobasco, Berendt. 



Staurotypus salvini * Gray, Bocourt, Miss. Sci. Mexique, iii. Reptiles, p. 22, pi. v, 

 f. 3, 1870; Giinther, Biologia Centrali Americana, 1885, Rept., p. 11; Siauremys 

 salvini Gray, Proc. Zool. Soc. Lend., 1864, p. 27; Suppl. Cat. Shield Rept., 1870, 

 65 ; Claudius severus Cope, Proc. Acad., Phila., 1872, p. 24, teste Giinther ; Claudius 

 pictus Cope, 1. c, p. 26. 

 Guatemala, iSaitiitt ; Vera Paz, Bocourt; Tehuantepec, /Sttmic/frast 



* Dr. Giinther, after examination of several specimens of this species, comes to the conclusion that 

 the Claudius severus is not different, and that the genus Stauremys of Gray must be united with Stau- 

 lotypns. As Dr. Giinther finds Gray's definitions of both his species and genus to be only applicable 

 to certain individuals, or to be unreliable, his conclusions are accepted in this catalogue, and the sup- 

 posed forms united. 



Another observation of Giinther in the same work (Biologia Centrali- Americana), requires no- 

 tice. He remarks that he does not find the characters of the genus Claudius sufficiently distinc- 

 from Staurotypus. As I at one time, without full investigation, placed the Staurotypug salvini in 

 Claudius, I have given some support to such a view. On examination of the plastron of the two 

 species, I now find that they not only belong to different genera, but to difi'erent famOies .and different 

 suborders. Staurotypus is clidostern, with the plastron and carapace firmly united by close suture. 

 In this division it outers the Cinosternida), having no mesosternal bone. On the other hand, Claudius 

 is one of the Chelydrid;e, the plastron having only contact with the carapace by free digitations (Dac- 

 tylosterna), and there is a largo mesosternal bone. Its near .ally is Chelydra. 



