HYNOBIIDAE. 479 



apparently not very firm as the next month there appeared "The 

 Reptiles and Amphibians of Hokkaido" by Kuhne, Hatta, and him- 

 self, in which only lichenatus is recorded from Yezo. Abe (1921) after 

 examining Hashimoto's specimens concludes that there is only one 

 species on Yezo. 



My conclusion, then, is that the present form is amply distinct from 

 any of the Hondo species. It may, of course, be proven eventually 

 that two species occur on Yezo, and that the other is the same as one 

 of the Hondo forms, but I take the liberty of expressing polite doubt. 



Its relationships are with what I have called peropus and are shown 

 in the shortness of the vomerine series, shortness of body, color of 

 larva, and to some extent in the color of the adult. This relationship 

 is rather remote, the fact being that retardatus seems to represent an 

 end form, and while peropus seems to represent the stock from which 

 retardatus was derived, a great deal of differentiation has taken place. 



Inukai (1922) says that this animal is neoteinic and " brings offsprings 

 in the larval stage," "as quite recently made known by Dr. Sasaki." 



The breeding season of 1922 was April 7-21, and the eggs were laid 

 in long sacs as described for keyserlingii, 25-37 in a sac. 



Besides the specimens listed below it has been recorded from 

 Kashiuchi and from Yubari, both in the high eastern part of the 

 Hirahara district of Ishikari Province (Hashimoto 1910). 



Specimens seen: 14, as follows; 

 Yezo: no definite locality, 1 (M. C. Z. 5122). 



Nemuro Province: Nemuro, 1 (Cal. Acad. Sci. 25990). 

 Iburi Province: Noboribetsu, 2 (Cal. Acad. Sci. 35927-35928); 

 Kutara Lake, 1 (U. S. N. M. 64902) ; estuary of Shirise- 

 tunai R., near Lake Shikot.su, 1 (U. S. N. M. 64903). 

 Ishikari Province: Sapporo, 8 (Cal. Acad. Sci. 25982-25989). 



Hynobius sonani (Maki). 



1921. Salama ndrclla sonani Maki, Zool. Mag. Tokyo, 34, p. 636. 



1921. Hynobius formosanus Maki, loc. cit., p. 637 (Mt. Noritaka, 7000 ft. alt., 

 collected May, 1919, by Mr. Sonan). 



1921. Hynobius arisanensis Maki, loc. cit,, p. 637 (Mt. Ari, 6600 ft, alt,, col- 

 lected March 1921, by Mr. Ando). 



Type: Adult female, collected May 1919, by Mr. Sonan. 



Type Locality: Mt. Noritaka, Formosa, at altitude of 10,000 ft. 



Range: Mountains of Formosa. 



