1893.] ii-jO [Baur. 



sharp median hook, but no lateral notches. The upper jaw is very finely, 

 the lower one strongly, serrated. A number of spechnens in Mr. Kohn's 

 collection from Mobile bay, Ala., and New Orleans, La., agree with the 

 type. 



Skull like Pseudemys concinna LeC, but larger ; shell very much more 

 arched, especially in front, than that of P. concinna ; coloration as in the 

 latter form. Animal much larger than P. concinna, the upper shell reach- 

 ing a length of 385 mm. (over curve). 

 We have, therefore, the following species of Pseudemys : 

 Pseudemys concinna LeC. 



hieroglyphica Holbr. 

 labyrinthica C. Dum. 

 floridana LeC. 

 mohiiiensis Holbr. 

 rubiventris LeC. 

 alabamensis Baur. 

 texana Baur. 

 These forms can be arranged in two series. 



A. Both jaws strongly and coarsely serrated ; upper one notched me- 

 sially, with a cusp on each side. Lower jaw with a median cusp. 



1. Pseudemys rubiventris LeC, Baur. 

 Tj-pe from Delaware, near Trenton. 



2. Pseudemys alabamensis Baur. 

 Syn., PtycJiemys mobiliensis Ag. (part). 



Type fi;om Mobile bay, Ala. In the collection of Mr. G. Kohn, 

 New Orleans, La. 



3. Pseudemys texana Baur. 

 Syn., Ptychemys mobiliensis Ag. (part). 



Type from San Antonio, Texas. No. 246 Philadelphia Academy. 



B. Generally lower jaw only strongly and coarsely serrated ; upper 

 without median notch, no cusps on the sides. Lower jaw with a 

 median cusp. 



1. Pseudemys concinna LeC, Gray. 

 Type from upper parts of rivers of South Carolina and Northern 



Georgia. 



2. Pseudemys mobiliensis Holbr., Baur (non Ag.. non Boul.). 

 Type from Mobile, Ala. Philadelphia Academy, Nos. 241, 242. 



Syn., Einys orthonix Wied. 



3. Pseudemys floridana LeC, Baur. 

 Type from St. John's river. Eastern Fla. 



4. Pseudemys hieroglyphica Holbr., Gray. 

 Type from Cumberland river, Tenn. No. 217, Philadelphia 



Academy. 



5. Psetidemys labyrinthica (Les. MSS.) C Dum., Gray. 

 Type from Wabash river. 111. Museum Natural History, Paris. 



