50 GRAPE Cn/rURK AND 



as for the first time since observations were begun, this form 

 was during that season found to issue in swarms like those 

 observed elsewhere, doubtless greatly increasing its spread. 



We are further justified in supposing that there must be 

 some peculiar condition for their development in districts 

 where only occasionally evident signs of their workings are 

 visible ; and in no case have the winged insects been found 

 in such numbers as were developed in 1884. 



At the middle of October, 1882, the insects were stilt 

 numerous, eggs plentiful, and the mothers still laying ; the 

 winged form had e'ntirely disappeared. About the middle of 

 November. I found only one of the mother-lice fully devel- 

 oped ; the remaining insects scattered over the roots were 

 young larvae, healthy and quite active. Some were blackened 

 and lifeless, but still retained the larval form. Only one egg 

 was found. 



December twentieth none of the mother insects could be 

 found ; only larvae, bright but motionless, were present. 



SUMMARY OF OBSERVATIONS IN l88l 82. 



The condition of the insect during different times of the 

 year may therefore be summarized as follows ; There is a 

 dull, lifeless condition of both larvae and mother lice during the 

 winter, lasting until about the middle of April of a late season, 

 when the hibernating mothers begin to lay their eggs. The 

 young larvae soon begin hatching out and scatter to all parts of 

 the roots. The increase is very slow until the middle of 

 June 1 . ' The winged form begins developing about the first of 

 July. Eggs are most numerous about the last of July or first 

 part of August. The old mother lice are soon found in 

 decreasing numbers, and young larvae are most abundant. A 

 gradual decrease in the number of insects begins about the 

 first of October. No eggs, or scarcely any, are to be found 

 after this month. Very little action or life is noticeable after 

 November. 



