154 ON THE BATRACHIA AND REPTILIA OF COSTA RICA. 



the vertebral scuta longer than wide. According to Gray, the keels of the ver- 

 tebral scuta of the C. annulatus are confined to their anterior part, and the colors 

 are materially different. It also resembles the C. incisus, Bocourt ; but this turtle 

 is represented as without the row of scuta on the inner front of the tibia ; the 

 edge of the carapace is strongly dentate, and the gular scuta are much longer, and 

 have a very different anterior margin. I only know this species from the figure and 

 description of Bocourt. 



The Chelopus gabbii is dedicated to the learned geologist who made the col- 

 lection here described. 



130. Chelopus funereus, sp. nov. 



Represented by four specimens, none of which are adult, the largest having a 

 carapace 4.75 inches in length. On examination with the view of ascertaining 

 whether they represent the young of the C. gabbii, I find so many distinguishing 

 features as to render it necessary to name them. 



As in young tortoises, the carapace is wider than in adults of the same species. 

 It is not revolute and very slightly serrate behind. An obtuse vertebral keel. 

 Plastron notched behind ; the anterior lobe with a shallow concavity of the ante- 

 rior border, the edge on each side of it projecting in three teeth. The free border 

 of the humeral scute is strongly convex behind the gular. The feet are more 

 strongly webbed in this species than in the last, and there are five scuta on the 

 external border of the hind foot, which do not terminate in a large one, since 

 there is no projection representing the outer toe. There is no row of scuta on the 

 inner face of the tibia ; but the forearm is plated in front, on the outer edge, and 

 in a band behind the wrist. In the smaller specimens there is a slight notch in 

 the border of the upper jaw, in the larger it is absent. The median suture of the 

 gular scuta is twice as long as that of the humerals. The first vertebral scute is 

 relatively longer than the others, while the last one is only half as large as those 

 that precede it. 



Color black on the upper surface of the head, neck, and carapace ; plastron 

 black, except a narrow, yellowish border. Throat, limbs, and marginal scuta 

 below, yellowish, black speckled. Outer side of hind legs and feet, and outer 

 edge of fore legs black. Some rows of black spots on the lower jaw and front of 

 fore leg ; anterior toes yellow, with black borders No markings on the upper 

 side of head and neck. 



The adult of this species will probably be found to be of very obscure color. 

 It displays unusual tardiness in the ossification of both carapace and plastron, 

 the largest specimen being very soft. It is probably allied to the Mauremys fuli- 

 ginosa of Gray. From Limon. 



