phylloxeridj:. 75 



Siphonophora solidaginis, but the results are less com- 

 plete than those of 8. mittefolii. 



In September the males and females were often seen 

 coupled together under the flower heads of Solidago, 

 but singularly, as in the other mentioned case, the egg 

 was never detected on the food-plant. The gravid 

 females descended the stalks, and might be found at 

 all heights, more than two or three inches from the 

 ground. 



M. Balbiani thinks that these Aphides abandon the 

 plants of Solidago vergaurice, which, in summer, 

 harbour the viviparous broods, in order to lay their 

 eggs on some of the low plants in the immediate 

 neighbourhood; exactly as has been seen to be the 

 habit of Siphonophora millefolii. 



