HYNOBIIDAE. 



491 



other ; middorsal line of tail yellow ; sides of body and of base of tail 

 marbled yellow and black; sides of distal half of tail black; total 

 length 123 mm., head 17.5, body 62.5, tail 43. 



A young specimen, Cal. Acad. Sci. No. 26519, same data, has the 

 appressed toes meeting; the coloration is scarcely different from that 

 of the described female; total length 49 mm., head 8, body 21, 

 tail 20. 



A larva, Cal. Acad. Sci. No. 26562, same data, has external gills 

 pigmented, and rather flat and wide; the dorsal fin extends a little 

 forward of the middle of the body; pigmentation rather uniform and 

 confined to the dorsal surface, save on the tail which is more coarsely 

 spotted all over; there is a fold of skin along the leg from the fifth toe 

 up; total length 49 mm., head 8, body 20, tail 21. 



Among the adults the males have longer tails and the black spotting 

 of the dorsal surface tends to obscure the yellow ground color, by 

 coalescence of the spots. Certain males, e.g. No. 26479, are quite 

 black above. Males also have the legs proportionately longer as do 

 the young. Of 18 males one has the appressed toes meeting, 16 have 

 them separated by one costal fold, and two by two; while of 20 females 

 the appressed toes are separated by one costal fold in two, by two in 

 eight, and by three in ten; of fifteen young ten have the appressed 

 toes meeting, in four they are separated by one costal fold, and in one 

 by two. 



A few females are almost as dark as the described male. The 

 costal groove count is 14 in five out of 13 males, 13-14 in one and 13 in 

 the other seven; it is 14 in two out of eleven females and 13 in the 

 nine others. 



The fifth toe is rudimentarv on the left side in No. 26463, a male: 

 another male, No. 26492 is a partial albino. 



These are the only noticeable abnormalities in a series of 184. 



Remarks : I have included two of the three references in the litera- 

 ture to H. nebulosus from Tsu-shima in the synonymy of this species. 

 Neither are accompanied by descriptions. The third is accompanied 

 by a description but apparently refers to H. tagoi from the North 

 Island. 



I think Abe's H. tsuensis refers to this form. He says Tago made a 

 plate of it. Tago took it at Iwahara, on the southern island. 



The Hynobius of South Tsu-shima differs strikingly in color from its 

 close ally H. tagoi of North Tsu-shima, resembling rather H. vanden- 

 biirghi of Hondo, from which it can easily be told by the very flat tail 

 of the latter. The black spotting is much coarser than in the forms 



