ON THE BATRACHIA AND REPTILIA OP COSTA RICA. 



97 



behind the orbit as a rugose osseous plate to opposite the inferior border of the 

 pupil of the eye, bounding the position usually occupied by the membranum 

 tympani by a rough concave margin. The canthus rostrales are short and inclose 

 a groove between them ; the loreal and labial regions are rugose with small tubercles. 

 The profile of the muzzle descends abruptly to the lip, which it does not overhang. 

 The nostrils are as far removed from each other as each one is from the orbit. The 

 posterior outline of the cranial ossification is squarely truncate in adults. 



The parotoid glands are short, subtriangular, sublateral, and as deep as long. 

 They are not continued into a fold. The upper surfaces of the body and limbs 

 are studded with round warts, so closely on the latter region as to resemble a 

 pustular disease. A row of larger tubercles extends from the parotoid gland to 

 the axilla. The inferior surfaces support numerous smaller tubercles. The fingers 

 are short and free, and the palmar tubercles are very obtuse. There are neither 

 tarsal folds nor tubercles, those of the sole being very obscure. Toes half- webbed. 

 The end of the longest toe reaches the end of the muzzle when the limb is 

 extended, and the longest finger reaches the vent. 



The color above is yellowish-brown ; below, dirty brown. A blackish band 

 extends from the parotoid to the axilla, the color not affecting the apices of the 

 tubercles in its course, and sometimes extending to the abdomen. Throat with a 

 black spot; top of head yellow or brownish-yellow. 



M. 



Length of head and body . 



to orbit .... 

 " to posterior border of cranium 

 " to axilla 

 " of fore limb . 

 " of hand 

 " of hind limb . 

 " of hind foot . . 



.058 

 .005 

 .016 

 .023 

 .035 

 .013 

 .060 

 .035 



Several specimens from 2500 feet elevation on the slope of the Pico Blanco, in 

 the district of Uren. 



5. Crepidius epioticus, Cope, gen. et sp. nov. Bufonidarum. 



Char. Gen.— No ostia-pharyngea, membranum tympani, nor vomerine teeth ; 

 parotoid gland present. Cephalic derm not occupied by ossification. The digits 

 of all the feet inclosed in the skin, leaving the longest median toe projecting ; 

 inner digits of both feet rudimental. 



In this new genus the structure is much as in Atelopus, resembling also, but in 

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