354 THE ENTOMOLOGIST. 



E?iiomological Society of Belgium. — M. Weyers has 

 resigned his Secretaryship of this Society, which has 

 experienced great difficulty in finding a successor to one 

 whose courtesy was so remarkable. He is succeeded by 

 M. de Borre, who may be addressed at No. 1, Place du 

 Musee, Brussels. 



Phylloxera coccinea. — This strange insect, which I found 

 so abundant on oak at Leominster, in August, 1869, and 

 concerning which Mr. Walker supplied a most interesting 

 note (Entom. iv. 316), has appeared in numerous different 

 localities in France. MM. Planchon and Litchtenstein 

 continue to study its economy, but hitherto without having 

 discovered anything new. We are still in ignorance of the 

 male. 



Migration of Aphides. — In reference to Mr. Clifford's 

 remarks on this subject in the July number (Entom. 346), 

 Mr. Walker has obligingly sent me the following note: — "I 

 believe that the migrations of Aphides are very short, and 

 that the change in the atmosphere, of which the gloom called 

 a blight is the result, is the cause directly, and by its effects 

 on vegetation, of hastening the appearance and of increasing 

 the number of the winged Aphides. When the Aphides have 

 for food a plentiful supply of sap they generally continue in 

 the wingless state, and multiply most rapidly : such is the 

 case with the Aphides of water-plants, of the elder, and 

 of the bean. When the atmosphere checks the supply the 

 winged state begins to abound, and is preceded by the warm 

 dull air that occurs periodically. The winged Aphides of the 

 elder may be observed to be more frequent in the clusters 

 beneath the leaves, than in the clusters on the larger shoots, 

 where the supply of sap is more abundant. In the autumn 

 the atmosphere, also, is the cause of the second especial 

 appearance of the winged Aphides, which fill the air in the 

 calm cloudless days at the end of September and in the 

 beginning of October. It was' remarked more than half 

 a century ago, that the autumnal change in the temperature, 

 and its effect on vegetation, is the cause of the appearance of 

 the final state of A})hid6S ; and these insects have been kept 

 four years successively in a green-house, without any appear- 

 ance of the final state ; and I have seen, during a continuous 

 mild winter, the Aphis of the nettle still viviparous, and not 



