ON THE BATRACHIA AXD REPTILIA OF COSTA RICA. 



Ill 



small but prominent obtuse cuneiform bone at the base of the inner toe ; other 

 than this there are no folds or tubercles on the tarsus or carpus. 



The skin is smooth on the upper and lower surfaces, with the following 

 exceptions : A dermal fold extends from each exoccipital region on each side of 

 the back, pursuing a concave course to the middle of the transverse process of the 

 sacrum. A similar fold extends from the vent on each side, in an oblique direction 

 to the end of the transverse sacral process. Sides of body areolated. 



The exoccipital bone sends inwards and backwards a recurved crest, in antici- 

 pation, as it were, of the " parieto-quadrate" arch of Ceratophrys. There is 

 also a strong zygomatic process of the squamosal, but no malar process to meet it. 



The color above, in spirits, is a light ash ; below white, the sides of an inter- 

 mediate shade. A black spot extends from the tympanum to the scapula, and 

 sends a line to the eye. The posterior face of the femur is black marbled distally 

 with ash ; the black extends as a well-defined patch to the vent. Entire sole of 

 foot black. Legs distantly cross-banded above. Lips brown ; some small dark 

 spots on the lower rim of the orbit. The breast, abdomen, and lower side of 

 femur and tibia are marked with black, forming a figure like the refuse of the 

 plates of a button-maker, t. e., representing the interstices between large confluent 

 white spots. 



Length of head and body . 

 " to orbit (oblique) 



" to angle of jaws (axial) 

 Width at angle of jaws 



" of interorbital region 



" of sacrum 

 Length of fore limb . 



of fore foot 

 of hind limb 

 of hind foot 



M. 



.070 



.011 

 .025 

 .035 

 .007 

 .017 

 .038 

 .016 

 .092 

 .045 



This species is intermediate between the Ceratophrydine group of Cystignathiche 

 and the Hylodine, and illustrates the propriety of their union as I proposed in 

 1865. I find no technical characters by which to separate it from Lithodytes, in 

 which genus it is analogous to the Hylodes sulcatus in the genus Hylodes, where 

 the same elevation of the superciliary borders appears. With present experience 

 in the genus Bufo, such a character does not appear to warrant generic separation. 



A female specimen, containing eggs ready for deposit, was taken by Mr. Gabb 

 on a spur of the Pico Blanco, at 6000 feet elevation. 



