436 AMERICAN TESTUDINATA. Part II. 



and fi'om Brownsville, in Texas, through the Smithsonian Institution. There can 

 be no doubt, therefore, that this species extends over the most extraordinary 

 range ; which is more difficult to exjjlain than that of any American Emyd. The 

 young are represented PI. 3, fig. 9-11 ; the eggs, PL 7a, fig. 18 and 19. 



Trachemys rugosa, Ag} I mention this species only to state that it differs 

 from its North American representatives by its elongated form, the slight notches 

 of the hind margin, and the very coarse rugosities of the back. There is a 

 light longitudinal baud on the side of the neck. Its color varies from a light 

 salmon to a dark gray. I have seen specimens from the Havana, sent by Pro- 

 fessor Poey to the Smithsonian Institution. 



III. Graptemys, Ag. The great width of the smooth and flat horizontal alveolar 

 surface, and the spoon shaped dilatation of the extremity of the lower jaw, chiefly 

 distinguish this genus. There is no notch in the upper jaw. The tessellation 

 of the skin amounts to scales only on the back of the neck ; but there are large 

 scales upon the feet, and a row of prominent ones along the outer edge of the 

 fore legs. The young are strongly keeled, and their margin deej)ly notched, espe- 

 cially behind and on the sides, with a smooth surface, as prevails also in the 

 adults ; in old specimens, the concentric lines of growth of the scales are some- 

 times distinct. The persistence of the keel along the middle line of the back 

 in the adults seems to be a character of inferiority, considering that it disap- 

 pears in many species which are keeled wdien young, as, for instance, in Ptyche- 

 mys. Though I had no opportunity of comparing specimens of Gray's Emys 

 sinensis, I consider it as the Chinese representative of this genus. May not Emys 

 Bennettii, Gr., also belong to this group ? 



Graptemys geographica, Ag? Common from Pennsylvania and New York to 

 Michigan, Tennessee, and Arkansas. I am indebted for specimens from Michigan 

 to Prof A. Winchell, of Ann-Arbor ; from Quincy, Illinois, to Dr. Watson ; from 

 Delphi, Indiana, to Mr. Franklin Hill; from Ohio, to Mr. George Clark, of Toledo, 

 to Mr. Joseph Clark, of Cincinnati, and to Dr. Kirkland, of Rockport ; from 

 Pennsylvania, to Prof Baird, and S. S. Haldeman; from Blount county, Tennessee, 

 to Prof Baird; and from Arkansas, to Mr. G. Stolley. The young are represented 

 PL 2, fig. 7-9; the eggs PL 7a, fig. 28-30. 



Graptemys LeSueurii, Ag?' This species is only known in the Western States, 



■^ This is the Emys rugosa of Gray, but not of niacrocephala, in tlie first edition of tlie N. Am. Herp. 



Shaw. It is figured by Ramon de la Sagra, Cuba, In the second he adopted LeSueur's name (p. 87). 



Kept., pi. 2. Gray's E. vermiculata (Cat. Brit. Mus., Emys labyrinthicsf Ze,S. is only a variety of this spe- 



1844, p. 25) is the same. cies, remarkable for the numerous meandering lines 



^ First described by LeSueur under the name of upon the bridges of the sternum. 

 Testudo geographica. Dr. Holbrook called it Emys ^ This species is commonly called Emys pseudo- 



