140 MR. BOULENGER ON A NEW SPECIES OF BUFO. [Mar. 20, 



adopt the former view, having little doubt that it is outside the 

 range of variation of even so variable a species as Bufo vulgaris. 

 I will call it 



Bufo formosus, sp. n. (Plate XXIII.) 



In its general characters this species agrees with Bufo vulgaris, 

 especially the Japanese form, which it resembles in the large size, 

 the larger head, the perfectly distinct tympanum, and the black 

 markings. But it is distinguished by the following characters : — 



The tympanum, which is perfectly exposed and circular, is quite 

 as large as the eye, and measures three fourths the greatest diameter 

 of the orbit. The parotoids are much narrower, their width being 

 contained three times and a half in their length. The hind limb is 

 longer ; if it is carried forwards along the body, the metatarsal 

 tubercles reach the centre of the eye in the female, the anterior corner 

 of the same in the male. The fingers and toes are more elongate, 

 and the web between the latter shorter (the specimens were captured 

 during the breeding-season, as is indicated by the male's digital 

 asperities). The first finger being laid against the second, does not 

 extend quite so far as the latter ; in B. vulgaris it is the reverse, the 

 first finger extending slightly beyond the second. 



Upper surfaces brown, washed with carmine ; a black lateral 

 band as in B. vulgaris of Japan, bordered above by a yellowish 

 streak ; lower surfaces yellowish, the belly and the lower surface of 

 the limbs largely marbled with black ; a black liue bordering the 

 lower lip. This line is constant in the Japanese specimens of B. 

 vulgaris, absent in the continental specimens. 



Two specimens, male and female, were collected at Yokohama 

 during the expedition of H.M.S. ' Challenger.' 



The following dimensions should be compared with the table 

 given in my monograph of the Paleearctic and -Ethiopian species 

 of Bufo (P! Z. S. 1880, p. 570 '). 



millim. milliui. 



From snout to vent 125 112 



Length of head 35 31 



Breadth of head 51 A'i 



From eye to nostril 8 8 



From eye to tip of snout 18 15 



Greatest diameter of orbit 12 11 



Interorbital space 13 12 



Diameter of tympanum 9 8 



Length of parotoids 28 21 



Breadth of parotoids 8 6 



Body 90 81 



Fore limb 87 80 



Hind limb 172 142 



Tibia 47 40 



1 Column /, " length of head 48 millim." is a misprint for " 38 millim." 



