354 THE ENTOMOLOGIST. 
Entomological 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 
Musée, 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 Aphides; 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 
