159 



numerous meandering lines upon the bridge of the sternum. Not having 

 seen specimens, I am unable to state how it diflers from C. concinna. Dr. 

 G. Baur, of Chicago University, to whom I am indebted for notes 

 regarding it, states that the skull is much different from that of all other 

 species. He believes that Prof. H. Garman's specimen from the Wabash 

 River, described as concinna, belougs to LeSueur's labyrinthica. The two 

 species are closely related, aud specimens should be carefully sought along 

 the Wabash and preserved. 



Chrysemys concinna, (LeConte). 

 The Neat Terrapin. 



Testudo concinna, LeConte, 1820, 63, iii, 100 ; E^nys concinna, Holbrook, 

 1842, 5^, i, pi. 8; Pseudemys concinna, Gray, 1855,55, 34; Ptychemys 

 concinna, Agassiz, 1857, 4, i, 432, pi. ii, figs. 4-6 ; Chrysemys concinna, 

 Boulenger, 1889, 8^, 83. 



Form of the shell somewhat variable in specimens of all ages, some 

 having the greatest breadth at the middle, others at the hinder part; 

 some are depressed, others more elevated. The young have a distinct 

 keel, which is lost in half-grown specimens. The posterior border of the 

 carapace is slightly serrated, the notches being between the scutes. 

 Plastron with its posterior border with a distinct emargination ; the hinder 

 lobe not two-thirds the width of the carapace. Bridge wide, rising with 

 moderate rapidity toward the carapace. Head of moderate size, the snout 

 short and blunt. Upper jaw not at all notched in front; the cutting 

 edge smooth ; the alveolar ridge strongly tuberculated. Lower jaw with 

 its sheath flat and rough on the outside, the cutting edge coarsely serrated, 

 the tip with a sharp upturned point. Limbs well developed ; all the 

 digits webbed beyond the bases of the claws. Claws of the fore limbs of 

 the males very long. 



Color of the upper shell olive or brownish, with markings of yellow and 

 dark brown. A yellow band usually runs down the middle of each costal 

 scute. This usually sends off lateral anastomosing branches, which divide 

 off the surface into a few large areas. Within these the yellow and 

 brown are arranged in concentric lines. Both the upper and the lower 

 surfaces of the marginals have eye-like spots of brown and yellow, one 

 located across each suture. Across each scute there usually runs a yellow 

 vertical band. Plastron almost uniform yellow, a few small spots of 

 •dusky on the anterior end, and about two on each bridge. Head, neck, 

 legs, and tail brown, with many longitudinal stripes of yellow, or some- 

 times red. On the head there is a median stripe from the snout to the 

 back of the head; another starting over the eye, widening on the bpck of 

 the head ; a stripe starting at hinder corner of the eye ; another originat- 

 ing under the eye ; and all, except the median stripe, running back on the 



