RANA. 



303 



space broad, flat, usually as broad as or a little 

 narrower than the upper eyelid, sometimes, however, 

 only two-thirds the width of the latter, as broad as 

 or a little narrower than the distance between the 

 nostrils ; tympanum very distiuct, distant from the 

 eye, measuring one-half to two-thirds, rarely three- 

 fourths its diameter. 



Fig. 109. 



Open mouth and upper view of head. 



Fingers obtuse, first extending slightly beyond 

 second ; subarticular tubercles moderate. 



The tibio-tarsal articulation reaches the tympanum, 

 the eye, or the nostril, very rarely the tip of the snout ; 

 tibia shorter than the fore limb, a little longer than 

 the femur, as long as or a little shorter than the foot ; 

 the heels overlap when the limbs are folded. In some 

 specimens from Spain the tibia is but very slightly 

 shorter than the fore limb. Toes slender, two-thirds 

 or almost entirely webbed, the terminal phalanx of the 

 fourth toe, however, always free ; toes one-half to 

 two-thirds webbed in the Spanish var. parvipalmata ; 

 subarticular tubercles moderately developed ; inner 

 metatarsal tubercle feeble, soft, roundish or oval, 

 measuring less than one-half, usually about one-third, 

 the length of the inner toe ; a small and rather indis- 

 tinct tubercle rarely present at the base of the 

 fourth toe. 



Skin smooth or with irregular smooth warts ; a 

 A-shaped glandular ridge usually present between the 

 shoulders ; glandular dorso-lateral folds narrow or 

 moderately broad, moderately prominent, converging 



