98 



ON THE BATRACHIA AND REPTILIA OF COSTA RICA. 



less degree, the genus Oedipus of the salamanders. In other respects the form is 

 that of OUotis, Cope. 



Char. Specif. — Size medium ; cranial crests consisting of supra-tympanic, 

 supra-orbital, and canthal ridges, the last two continuous with each other and 

 extending in a nearly straight line to the nares, with a slight thickening opposite 

 the front of the orbit. The intervening concave surface is of moderate width. 

 The superciliary ridges send inwards a short tuberosity at the posterior third of the 

 orbit. The supra-tympanic is short and very protuberant, giving the cranium an 

 angulate outline. There is a low, narrow, post-orbital ridge. No trace of mem- 

 branum tympani. Parietal region with several small osseous nodules on each side. 

 Parotoid very small, subround. Skin everywhere rugose with minute tubercles, 

 which are sparse on the dorsal, dense on the ventral, regions. Soles smooth, no 

 tarsal, carpal, or solar tubercles or folds. Longest digit on both extremities 

 projecting 2.5 phalanges beyond the flat mass which includes the other digits. 

 Femur half-inclosed in inguinal integument. A concave dermal fold from end of 

 each sacral diapophysis to parotoid gland, which is easily obscured. 



M. 

 Length of head and body 035 



" to orbit . 



to angle of jaw 

 to axilla : 



to groin 



.004 

 .011 

 .017 

 .030 

 .019 

 .007 

 .030 

 .018 



" of fore limb 



" of fore foot 



" of hind limb (free portion) 



" of hind foot 



General color black, above a little lighter with a few darker spots on each side ; 

 soles yellowish ; entire scapular region brown ; sometimes a brown median dorsal 

 band. 



From 5000 feet elevation on Pico Blanco. 



6. Ollotis ccerulescens, Cope, gen. et sp. nov. Bufonidarum. 



No ostia-pharyngeanor membranum tympani. Parotoid glands present. Digits 

 free on all the feet. Cranial derm not occupied by ossification. 



This genus may be regarded as Bufo with the auditory apparatus incomplete, 

 agreeing in this respect with the preceding genera Crepidius and Cranopsis. 



Char. Specif. — The largest specimen is about an inch in length, and hence 

 perhaps not adult, although there are no marks of immaturity observable. There 



