1896.] BAtBACaiANS FEOM THE CAUCASUS 649 



The tibio-tarsal articulation reaches the end of the snout or 

 beyond, and the length of the hind limb between the vent and the 

 tibio-tarsal articulation exceeds the length of head and body ; the 

 tibia is a trifle shorter than the fore limb, and nearly equals the 

 length of the foot. The web between the toes, during the breeding- 

 season, is developed to the same extent as in R. temporaria : in the 

 male it reaches to the base of the penultimate phalanx on the 

 inner side of all the toes but the last, which is webbed to the very 

 tip ; whilst in the female the last two phalanges of the fourth toe 

 are free on both sides, and the distal phalanx is free on the outer 

 side on the three inner toes and on the inner side on the outer toe. 

 The free border of the web is deeply notched in the female, nearly 

 rectilinear in the male. In the male post nuptias the palmation is 

 as in the female. The subarticular tubercles are feebly or 

 moderately developed ; the inner metatarsal tubercle is small, oval, 

 soft, rather more developed than in R. temporaria and somewhat 

 less than in R. ar/ilis ; its length is not quite half that of the 

 inner toe ; a small tubercle is present at the base of the fourth toe. 

 As in R. temporaria, the skin of the back in the breeding male 

 is swollen through the great development of the lymph-cells, 

 whilst in the female pearl-like gi-anules are scattered on the sides, 

 on the pelvic region, and on the hind limbs. The glandular lateral 

 folds are feebly prominent ; the distance between them, on the 

 scapular region, equals one fifth to one sixth the length from 

 snout to vent. 



The specimens, which have been for some time in spirit, are 

 pale brown above, with large dark spots on the back and sides, and 

 regular cross-bars on the hind limbs ; a dark canthal streak, a 

 large temporal blotch and a dark streak along the upper lip ; a 

 more or less distinct light streak between the latter and the canthal 

 streak. Lower parts white, with small dark spots on the throat. 



As noticed before, the male is provided with a pair of internal 

 vocal sacs. 



c?. J. $. 



inillim. miUim. millim. 



From snout to vent 70 67 64 



Length of head 20 20 18 



Width of head 22 ' 22 20 



Diameter of eye 6-5 7 6 



Interorbital width 3-5 3-5 3-5 



From eye to nostril 5 4-5 4 



„ „ end of snout . . 9 9 8 



Tympanum 3*5 4 3 



From eye to tympanum .... 2'5 2 2*5 



Fore limb 45 42 37 



Hind limb 129 120 108 



Tibia 42 38 35 



Foot 41 39 35 



Inner toe 8-5 8 7*5 



Inner metatarsal tubercle . . 3'5 3*5 3 



