HERPETOLOGY OF JAPAN. 115 



one-half the former's greatest diameter; fingers bhmt, first finger 

 extending sUghtly beyond second; incision of web on both sides of 

 fourth toe a trifle deeper than the distal end of the basal phalanx; 

 inner metatarsal tubercle slightly compressed, its length equaling its 

 distance from subarticular tubercle of first toe; no outer metatarsal 

 tubercle; tibio-tarsal joint of extended hind limb reaches center of 

 eye; tibia less than half the length of head and body; heels overlap- 

 ping by less than interorbital width; skin above and below' smooth, 

 except posterior aspect of femur, which is coarsely granulated; the 

 dorso-lateral glandular folds but slightly raised, their shortest distance 

 contained five times in total length. Color (in alcohol) above brown- 

 ish gray, slightly grayer on snout, wdth obscure and ill-defined dark- 

 brown mottlings, which on the back and sides occasionally surround 

 a light s])ot so as to form ocelli; dorso-lateral folds lighter, externally 

 margined by an ill-defined brown line; indications of a dusky band 

 across the top of the head through the center of the upper eyelids; 

 upper lip mottled with browai; a brown line from tip of snout through 

 nostril to eye expanding behind the latter to form the usual dark- 

 brown ear-patch; brown stripe on anterior face of over arm long and 

 parallel with the axis; limbs cross-barred; underside whitish, the 

 whole surface coarsely marbled with brown. 



Dimensions. 



mm. 



Total length, tip of snout to vent 56 



Width of head 17 



Fore limb 31 



Hind limb, vent to tip of longest toe 87 



Tibia 27 



Males difi^er from females in the stronger, more muscular fore 

 limbs, which acquire an extraordinary development during the pair- 

 ing season; in the pad-like sw elling of the inner side of the first finger, 

 which becomes covered with black horny spinules during the same 

 season; in the greater development of the wel) between the toes; and 

 in the presence of a pair of internal vocal sacs, situated at the sides of 

 the throat. "■ 



Variation. — Apparently this species is much less variable than 

 R. japonica, especially if we consider its great geographical distribu- 

 tion. The presence of more or less numerous glandular warts on the 

 upper surface and sides, so conspicuously absent in the specimen 

 described above, depends on the season, they being best developed 

 during the breeding time, in museum specimens also to some extent 

 on the state of preservation and the preserving fluid employed. The 

 color, however, varies greatly both as to the tint of the ground color 

 and as to the amount and distinctness of the dark markings, some 



oBoulenger, Tailless Batrach. Europe, p. 305. 



