RHOPALOCERA NIHOXICA. 21 



Family PIE RID.<E Continued (see Page 10.) 



Terias biformis, H. Pryer. 



T. bethesba. Janson. (PI. 2, Fig. n.) 

 T. Iteta. Boised. (PI. 2, Fig. 10.) 



Since publishing what is written in page 10, I have, on conjunction with Mr. Nawa, of Gifu, made an 

 extremely interesting and important discovery. It is that T. bethesba is the summer form, and 

 T. la-ta the winter form, of one and the same species. This was quite unexpected. Both Mr. Nawa and 

 myself saw female T. bethesbx depositing their eggs on Cassia mimosoides. From these eggs we reared 

 many specimens of T. ki'ta, but not a single individual bearing the most remote resemblance to the 

 parent form T. bethesba. I have, however, reared a single specimen from these bethesba ova, which 

 strongly resembles the hecabe form of T. multiformis, and it is therefore probably a hybrid. The 

 outline of the wing of 7'. Ixta is pointed, that of T. bethesba rounded, and the former is a much 

 larger insect than the latter. I have proposed the name of Terias biformis to unite these two 

 forms. The form T. Iseta is only seven days in the pupa, but lives for eight months in the imago 

 state, during which time it hybernates for from four to five months. On page 10 I state that T. Ixta 

 appears from March to November; this I now see is an error, the reverse being nearer the truth. It 

 appears last in the year in November-December and emerges from its hibernation first in March. I was 

 misled by this fact, not knowing the insect's life-history, into making the statement that different broods 

 of T. Ixta lived from March to November. The Ixta form emerges in the imago during the first week 

 in September, or, exceptionally, during the last few days of August, from ova laid by the bethesba form in 

 August, taking a remarkably short time to complete its metamorphosis. The Ixta form does not com- 

 mence to hybernate before November. It hybernates during the cold winter months, but the first warm 

 days iii March awaken it ; specimens may be seen flying about until May, when they deposit their ova, 

 which produce the bethesba form in July. A most interesting problem concerning these two forms remains 

 to be solved ; what is the reason for or benefit gained by this extraordinary change, which is, I think, 

 without parallel among Lepidoptera ? 



Family LEMONIID^. 

 60. Libythea lepita, Moore. (Pi. 5. fi g- '3) 



Localities Yokohama, NiUko, Yezo. 

 Food-plant Cehis sinensis, Pel's. 

 Time of appearance July to May. 



There is only one brood of this butterfly. It is the longest lived, in the perfect state, of any of the 

 Lepidoptera. It emerges from \\\Q pupa early in July, and lives until the following May. It retires to its 



