RIIOPALOCERA NIHONICA. 



7 



P Leucophasia sinapis, L. (PI. 2， figs. 7 and 8.) 



amttyensis, Men . 

 vilihia, Janson. 



Localities ― Fujisan, Asama-yania, Yezo. 

 Time of appeal ancc ― July, August. 



In the soulhern parts of tlie Main Island this is only found on the mountains, but in Nambu and Yezo 

 I believe it inhabits the plains. It is an open question whetlier vihbia is distinct from anairensis y 

 and tins can only be determined by breeding". As it is not found in the Yokohama district, I have no 

 opportunity of testinp" this, and must leave it to entomologists more favourably situated. It is probable that 

 vilibia and amurensis are "dual" forms, if not species. I have figured the two most dissimilar speci- 

 mens I could find. 



17. Rhodocera maxima, But, (い 1. ^ Hg. 5.) 



Localities ― Yokohama, Olmyama, Abama-)ama. 

 Time of appearance ― May, July. 



This has a much more robust appearance than the following, and contrary to the opinion I have 

 expressed elsewhere (Trans. Asiatic Society of Japan, May 9th, 1883), I now believe it to be perfectly 

 distinct, as, durino- the year 1885, I captured both "laxima and acuminata freshly emerged at Asama-yama, 

 and was then able to compare them under a favourable aspect, which I had not had the opportunity of doing 

 before. I have frequently obtained males only, in the spring about Yokohama, but never saw a female 

 here, and think they must be strays from the lower mountains in the vicinity. It undoubtedly hybernates. 



iS. Rhodocera acuminata, Feld, (Pi- 2, fig. 6.) 



Localities ― NiUko, Asama-}ama, Yezo. - 

 Time of appearance —- July. 



This species is only found, where I have collected, at a considerable elevation, but it inhabits the 

 plains in Yezo. Many insects in South Japan are contined to the mountains^ but are found lower down the 

 further we go north. I have seen none of the preceding species from Yezo, where it appears to be 

 wholly replaced by the present. In the case of maxima and acuminata we have an excellent example of 

 tlie " duality " of species. 



リ- Colias palaeno, L, (Pi- 厶 fi ズ. 3.) 



Localil ies ― Asa ma-yama. 

 Time of appearance ― July. 



This butterfly has a most extensive ranee, from Iceland to Central 】apan， where it lias its habitat at 

 an elevation of over 6,000 feet. I have setMi it commonly at the Yu-no-taira on Asama-yania. Owing to 



