104 ON THE BATRACHIA AND BJEPTILIA OF COSTA RICA. 



obtuse and moderately concave. Nostrils considerably nearer each other than to 

 orbit, which is large and equal to twice the area of the tympanum. The toes are 

 short, and digital dilatations large ; the fingers have a short web, which is deeply 

 emarginate ; the toes are not fully webbed, the membrane notched to opposite the 

 proximal end of the antepenultimate phalange. Head and body elongate, so that 

 when the limbs are closed the knee and elbow are not in contact. The heel 

 reaches the middle of the orbit, and the longest finger the femur. Skin smooth 

 above, areolate below. 



Color above, blue ; below 1 yellow (whitish pigment in alcohol). The blue 

 pigment is sharply bordered along the sides and extends on the upper surfaces of 

 the humerus and femur, as well as cubitus, tibia, and tarsus, and on the base of the 

 outer finger, and entire surface of outer two toes. Upper lip yellow bordered all 

 round ; vent yellow, no inguinal, femoral, labial, or other spots. 



M. 

 Length of head and body . . . ' . . . . .040 



" to angle of jaw ........ .010 



to axilla 014 



to groin . .036 



Width of head behind 014 



Length of fore limb ......... .022 



of fore foot 010 



" of hind limb ......... .055 



hind foot 025 



From near Sipurio. 



20. Htla nigripes, Cope, sp. nov. 



A species of the size of Hyla carolinensis, with longer head and limbs than the 

 last described species. Vomerine teeth in two short transverse series between the 

 inner nares; the latter equal to the ostia pharyngea. Tongue longer than wide. 

 The head is an oval, but the muzzle does not project; the canthus rostrales are 

 a little concave, and the lores are oblique. The orbits are large and from four to 

 five times the area of the tympanum. The digital dilatations ai - e moderate, the 

 web of the fingers extending about half-way to the end of the longest, notched 

 deeper than the line of the penultimate phalange. Web of toes not extending to 

 end of penultimate phalange. Upper surfaces smooth, the lower finely areolate. 



Color dark-brown, limbs and feet blackish. Lip brown, groin finely white and 

 blackish marbled ; no lateral border or band. Posterior face of femur black, 

 unspotted ; no spots on any other region. Sides of throat black-dusted. 



