RHOPALOCERA NIHONICA. 



1 6. Leucophasia sinapis, L. (Pi- 2, figs. 7 and 8.) 



amurensis, Men. 

 vilibia, Janson. 



Localities Fujisan, Asama-yama, Yezo. 

 Time of appearance July, August. 



In the southern parts of the 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 whether vilibia is distinct from amurensis, 

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

 opportunity of testing 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- Ehodocera maxima, But. (PI. 2, fig. 5.) 



Localities Yokohama, Olioyamn, Asama-yama. 

 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 yth, 1883), I now believe it to be perfectly 

 distinct, as, during the year 1885, I captured both maxima 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. 



18. Ehodocera acuminata, Peld. (Pi- 2 - fig- 6.) 



Localities Nikko, Asama-yama, 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 confined 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 

 the "duality '' of species. 



19. Colias palaeno, L. (PI- 2, fig- 3-) 



Local i lies Asama-yama. 

 Time of appearance July. 



This butterfly has a most extensive rang, from Iceland to Central Japan, where it has its habitat at 

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



