Clouded Yellow 



ing species is still very far from being satisfactorily 

 settled. That we do get a swarm over from the 

 Continent when conditions are favourable is a matter of 

 common knowledge, but whether we have resident and 

 permanent colonies of our own is still doubtful. In 

 any case this year (1911) has been a Hyale year, and 

 we give thanks. The ground colour of this butterfly 

 is a pale primrose-yellow. There is a broad black border 

 beginning at the tip of the fore-wing and continuing 

 on to the hind-wing, where it gradually dies out at the 

 bottom angle ; placed on this band of black are a few 

 yellow spots. There is also a black spot on the fore- 

 wing, and a faint orange spot near the middle of the 

 hind-wing. The under side is more of a yellow shade, 

 and a line of brown spots runs round the outer margin 

 of both wings. There is a silvery spot in the centre of 

 the hind- wings, like a figure 8 bordered with pinkish 

 brown, and in fine fresh specimens the fringe is of the 

 latter colour. The female is a shade lighter in ground 

 colour and also shows more black. 



The caterpillar may be looked for in June and July 

 on Clover and Lucerne ; it is green, with yellow lines 

 running along the back and sides. The chrysalis is 

 green with a single yellow line. 



The latter half of August and the first half of 

 September cover the best period of its flight in this 

 country ; on the Continent there is a spring brood. 



THE CLOUDED YELLOW (Colias Edusa), Plate IV., 

 Fig. i. As with the last species, we have still much to 

 learn of the habits of this fine butterfly. Some years 

 39 



