6 



RIIOPALOCERA NIHONICA. 



13- Pieris rapse, L, (Pi- 3， 6 ') 



cvucivova y But. 

 Localities ― All Japan. 



Food plants ― Cultivated cruciferse, sucb as daikon (radish), cabbages, &c. 

 lime of appearance ― March to November. 



Varies much in size. The Japanese specimens have been mistaken for Pieris brassica ヽ vide Mr. 

 Elwes, P.Z.S., Nov. 1 5th, 1S81, but this latter species does not occur in Japan. I noticed immense 

 swarms of P. rapx flying across the Bay of Kagoshima this year, but did not see any further south. 



M. Pieris napi, L. (Pi- 3， お， 8-ん， 8-b.) 



mevamera, But. 

 iiielete. Men. 



Localities ― M a in Island, \ tzo. 



Food plant- ~ An uncultivated cnicifer, Arabis hirsuta, Scop. 

 i line of appearance ― Marcli to October. 



The imago first appears in March, form megamera ; it is then a very different looking insect from the 

 succeeding broods (form nielctc). It varies in size from if inches to 3 inches. 



For m any years after I first commenced collecting here, I was surprized to find that what was then k n o w n 

 as me gainer a ^ only appeared once in the year, March and April, after which it entirely disappeared ； nearly 

 all the other Pienda^ bein ビ many brooded. I was therefore very anxious to ascertain u hat became of the 

 larva from April until the next autumn, or whether it remained for the whole summer, autum n ( and winter 

 in the pupa state. To obtain the unknown larva of a butterfly is a particularly difficult task ； the food 

 plant has to be discovered and the females induced to lay their ep-gs. By spending many days in 

 early spring watching the females, I was at last rewarded by seeing one busily depositing its eggs on 

 Arabis hirsuta, and from these I reared the entirely different form, mdete. I was not unprepared for this 

 result from my discoveries of a like change of form in Papilio xu tints and xuthulus } &c. 



15- Anthocaris scolymus, But, (Pi- 3， fi g- 4-a., 4-b.) 



Localities ― Vokoliama, Nikko. 



Food plant —— Cardainine sylvatica, ^>inU. 



1 nne of appearance ― March, A pi il. 



This insect undoubtedly only appears once during tlie year. There are no allied forms, an d it is the 

 only representative of the eenus in Japan. I k now little or nothing concerning its life history beyond the 

 fact that it feeds upon a bilter cress, common in marshy situations. 



