1890.] 



THE YOUNG NATURALIST. 



231 



doubtless, to injury inflicted on them, or to the altered conditions not 

 suiting them. 



Such, then, are my reasons for disbelieving in the blown-over 

 theory. If Galii is ever blown over, it must be often blown over. 

 Here are the recorded dates of its occurrence in 1870, a great Galii year : 



1st August. 



Derby. Another on 6th. 



1st 



Wolsingham. Others on 9th, 12th and 13th. 



2nd ,, 



Birmingham. Again on 3rd and 9th. 



3 rd 



St. Leonard's. 



3 rd » 



Staley Bridge. Another on 5th. 



5th „ 



Chepstow —two. 



6th 



Bolton. 



7th 



Leominster. 



7th 



Warrington. 



10th 



Gloucester. Also at Stamford Hill. 



12th 



Tooting. 



18th 



Haddington, Lancashire. 



End of ,, 



Wotham. 



No moths were reported from Wallasey ; but Mr. Gresley took 

 some fine larvae there on August 28th. Most of these captures of the 

 imago were made far from the coast. A reference to the " Entomolo- 

 gists' Monthly Magazine" for September, 1890, will show that, either 

 as imago or larva, it was met with from Devonshire in the South, to 

 Perth in Scotland. This was also a great year for Livornica ; and Alni, 

 which no one hints is "blown-over," was taken freely, showing that 

 the conditions were favourable for insect developement. 



Mr. Sharp's papers appear to me to exhaust the arguments against 

 voluntary migration, but as a solitary fact is worth a bookfull of 

 theory, I have given my one little fact to the controversy — that some 

 of the larvae go deep down to pupate. Some of these do not emerge 

 the first year, but when the conditions are favourable most of them 

 will do so, and then we have a good Galii year. 



