So I guess this is a map turtle.
I was thinking Graptemys ouachitensis, except I don't see the two other yellow spots below the eye and below the mouth, atleast not in the picture. I don't have a picture of the underside but it looks similiar to the undersides of Graptemys ouachitensis or false map turtles. There are two of them, they belong to a friend of mine... sorry the photos aren't very good, if necessary I'll try to get better photos next weekend.
Any ideas?

another pic

