110 ON THE BATRACHIA AND REPTILIA OF COSTA RICA. 



Length to axilla .......... .019 



Width of sacrum 009 



Length of fore limb ......... .037 



of fore foot 019 



of hind limb 096 



of hind foot 045 



Ground-color above, brownish-gray; below, dirty-white. The limbs are cross- 

 banded rather distantly with blackish, the bars extending on the front and back 

 faces of the femur as well as on the upper surfaces. A white median band from 

 muzzle to vent, which is bounded on the sides at different points with blackish. 

 A pink band extends from above each tympanum to the end of the ilium, and is 

 broadly bordered with black on the outer side, this color extending on the sides of 

 the animal as oblique black spots. The tympanum is black and sends a black bar 

 to the rictus oris ; two black bars pass directly from the orbit to the lip, and 

 another by the canthus rostralis and nares to the same. 



One specimen from 7000 feet elevation on the Pico Blanco. 



31. LlTHODYTES MEGACEPHALUS, Cope, sp. nOV. 



A large species with the physiognomy of a Ceratophrys. Head very large, 

 wide, and depressed, with oblique lips and lores. The end of the muzzle descends 

 obliquely from the nares to the lip. Orbit as long as the distance from its border 

 to the nostril, which is close to the line of profile, and distant from its fellow two- 

 thirds its distance from the orbit. Canthus rostralis distinct, not prominent, very 

 little concave. Orbits oblique, the superciliary borders rising from the end of their 

 anterior third into a strong ridge, which runs in a straight line and terminates 

 abruptly in a slight thickening at the posterior border of the cranium. The 

 posterior half of the cranium above is thus deeply grooved, while the top of the 

 muzzle is plane. The tympanic membrane is a vertical oval equalling one-third 

 the area of the opened eye; its long diameter enters the latter 1.75 times; its 

 6hort diameter, three times. The vomerine teeth are in two short approximated 

 series entirely behind the posterior borders of the choanae. Each is convex 

 forwards, and does not extend exterior to the line of the inner boundary of the 

 choanal. The tongue is oval, longer than wide, and widest behind where it is 

 entire. Ostia pharyngea larger than choanae. The limbs are short, and the 

 fingers and toes entirely free. The dilatations are small, especially on the hands, 

 but the terminal phalanges are T-shaped. The wrist extends beyond the end of 

 the muzzle, while the heel only reaches to the middle of the orbit. There is a 



