ON THE BATRACHIA AND REPTILIA OF COSTA RICA. 153 



TESTUDINATA. 



125. Sphargis coriacea, Linn. 



Young specimens from Limon, indicating a breeding place for this species. 



126. ClNOSTERNUM LEUCOSTOMUM, Dlim. 



Young and adults from Old Harbor and Sipurio. 

 127- Cinosternum albogulare, Dum. Boc. Miss. Sci. Mexique, p. 24. 



128. Pseudemys ornata, Bell; Callichelys ornata, Gray, Snpplem. Catal. Shield Reptiles, p. 48. 



129. Chelopus gabbii, sp. nov. 



Form resembling Testudo, stout, and with short thick feet with very short 

 webs. Outline of carapace a regular ellipse, the margin not incised, but a little 

 revolute behind and before. Top of shell flat in profile, bearing a well-marked 

 but obtuse keel from nuchal plate to the caudals. Vertebral scuta (in an adult) 

 broader than long, with straight transverse sutures ; penultimate narrower behind, 

 the last one the largest of all, wider than long. Plastron flat, turned up at the 

 bridges and in front, strongly notched behind. The anterior lobe is concavely 

 truncate in front, with a tooth-like protuberance at each outer angle ; the sides 

 oblique to the axilla. Gular scuta wide, their common suture not longer than 

 that of the humerals. 



Muzzle nearly vertical, beak not notched ; symphysis recurved, horny alveolar 

 ridge minutely serrate. Forearm with large scales in front, on the outer edge, 

 and in a transverse band behind the wrist. Hind leg with a row of large scales 

 on the inner front of the lower half of the tibia, continuous with those covering 

 the inner toe. Two scales on the outer posterior border of the hind foot, followed 

 by a large one covering the rudimental outer toe, which forms an obtuse process. 

 Tail smooth. 



Color above wood brown, middle of plastron from humeral scuta to posterior 



border darker brown ; remainder of lower surfaces, wax-yellow. Head brown 



above, a faint red band round the muzzle, and a short one on the median line 



above. A yellowish brown-edged band from the temple to the middle of the neck, 



and a similar one from the eye to the tympanum. Neck and limbs yellowish, 



speckled with brown and black ; hind legs blackish on the outer side. 



M. 

 Length of carapace ......... .186 



Width of 120 



Elevation of " 060 



This essentially terrestrial tortoise resembles the C. areolatus, Dum£ril, and the 

 C: annulatus {Rhinoclemmys, Gray). The former has a roof-shaped back, and has 

 39 



