ON THE BATRACHIA AND REPTILIA OF COSTA RICA. 105 



M. 



Length of head and body ........ .039 



to orbit 005 



" to angle of jaws ........ .011 



Width of head at angle of jaws ...... .013 



Length of fore limb ......... .024 



" of fore foot 010 



" of hind limb 065 



" of hind foot 016 



When the limbs are closed, the knee and elbow overlap some distance. The 

 species in form and sombre colors resembles some of the Scytopes, but is a true 

 Hi/la. 



18. Hyla ELiEOCHROA, Cope, sp. nov. 



A small species with elongate oval head and uniform coloration. The vomerine 

 teeth are entirely between the nares, and form two short series directed backwards 

 towards the middle line ; in some specimens the backward inclination is very slight. 

 The choanse are larger than the ostia pharyngea, and the tongue longer than wide. 

 The muzzle is elongate and plane above, and slightly projecting. Tbe nares are 

 as far from each other as from the lip border, and nearly twice as far from the 

 orbit. Eyes large, four or five times the area of the membranum tympani. 

 Digital dilatations large ; fingers entirely free. Toes with emarginate webs not 

 reaching the end of the antepenultimate phalange of the longest toe, which is 

 rather short. Skin above smooth, below finely areolate on the abdomen. Legs 

 long, the heel reaching the end of the muzzle, the wrist not quite reaching the 

 same point. 



Color above and below a uniform olivaceous, without spots. A pale area below 



the eye ; lip faintly marbled. 



M. 



Length of head and body 026 



" to angle of jaws ....... .009 



Width of head at angle of jaws 009 



Length of head to orbit 0045 



" to axilla 011 



of fore limb 016 



" of fore foot 007 



of hind limb 044 



» of hind foot 019 



27 



