20 THE ENTOMOLOGIST. 



about, a common insect at any time in Mauritius. Soon I 

 noticed that they were in immense numbers and all flying in 

 one direction, viz. up towards the top of the crater and down 

 wind, i. e. towards the east. Here at last I thoughf is a migra- 

 tion of butterflies, such as I have often read about. Then the 

 thought occurred to me, " Where do they go to when they get 

 to the top of the crater — do they go right up into the air and 

 drift away to sea, and what happens to them there?" This 

 seemed a problem that I could solve if I climbed to the top and 

 looked to see whether they went away in any given direction, 

 probably going straight before the wind. Up I went to the top, 

 when I found that the insects did not go any higher, but just 

 made a bee line for the other side of the crater, one after the 

 other — thousands of them. Then I walked round to the other 

 side, when I found to my astonishment that they were now all 

 going downhill. This required some further explanation, so 

 downhill I went after them till I got nearly to the bottom of the 

 Trou, when I found that the swarm was now going right-handed 

 round the base of the volcano. After them I went round to the 

 other side again, where I had been before, when I found that 

 the swarm went uphill ! In fact, the butterflies were all going 

 on an endless round, up the hill, across the top, down again, 

 and round to where they started. So much for a migration 

 when followed up. Why the butterflies did it I don't know ; 

 perhaps because as it happened to be a particularly fine day 

 they were feeling extra fit and happy, and were indulging in a 

 butterfly game. Possibly somebody will explain, for I cannot. 



Hong-Kong, South China: August 11th, 1911. 



A SECOND LIST OF THE APHIDIDiE FOUND IN KENT. 

 By Fred V. Theobald, M.A., F.E.S., &c. 



(Concluded from vol. xliv. p. 399.) 



Genus Hyalopterus, Koch. 



Hyalopterus flaviis, Kittel. — On cultivated aquilegias in a garden 

 in Wye, found by Mi'. Alban Duffield, June 6th, 1911 ; a few winged 

 and wingless females. 



H. dilineatus, Buckton. — On the upper surface of young rose 

 leaves. Wye, May 21st, 1911. All wingless females in small colonies 

 along the middle of the leaves. 



Genus Chaitophorus, Koch. 



Cliaitophorus versicolor, Koch. — On maple leaves, Wye, May 5th 

 to June 25th ; winged and wingless females. Also at Hollington 

 Wood, near Hastings, May 12th, 1911. This is given by Schouteden as a 



