RHOPALOCERA N I MONICA. 13 



3- Niphanda fusca, Brem. and Grey, (Pi. 4, fig- 2-) 



A^. dispar. Brem. 



Localities Nikko, Fujisan. 



Time of appearance June, September. 



The specimen figured is the female ; the male has more sharply pointed wings, and the coloration of 

 the upper surface is dull purple. It frequents high lands and mountain slopes. 



31- Dipsas saepestriata, Hew. (Pi- 4, fig- 3-) 



Localities Yokohama, Tokyo. 

 Time of appearance May and June. 



32. Dipsas lutea, Hew, (Pi. 4, fig- 4.) 



Localities Yokohama, Niklco, Yezo, Asama yama. 

 Time of appearance May and June. 



33- Dipsas jonasi, Janson, (Pi. 4, fig. 5-) 



Localities Yezo, Yokokawa, Asama-yama. 

 Time of appearance June, July. 



These three species form. a very beautiful and exceptional group of the Japanese Lycaenidae, and I 

 therefore treat them together. In the case of Dipsas lutea and D. jonasi, we have an undoubted case of 

 "duality." D. lutea is found both on the mountains and on the plains, but is more abundant in the 

 mountains. D. jonasi, so far as my experience goes, is a mountain insect only. D. sxpestriata, on 

 the contrary, is found on the low land only, and I have not yet seen it from Yezo. The coloration of the 

 females of all three species is very remarkable in every instance they have almost completely assumed 

 the coloration of the males, contrary to the rule in most of the Japanese Lycsenidae. The Lycaenidae, we 

 know positively, are descended from ancestors, both sexes of which were originally dull-colored, and the 

 majority of the females retain this characteristic, while the males are in many instances gaily colored ; 

 but in this group both sexes are almost exactly alike in point of beauty, the females still, however, gene- 

 rally showing a trace of their original dull color, in the black tip to the wing. All three species are most 

 active from about two hours before sunset until dusk, and during this time the males are to be seen flying 

 about the tops of the trees and engaging, often three or four at a time, in an aerial contest. 



34- Thecla smaragdina, Brem. (Pi. 4, fig- 6A, 6u.) 



Localities Nikko, Asama-yama, Yezo. 

 Time of appearance July, August. 



