116 
THE WEEKLY ENTOMOLOGIST. 
The following morning, it being very 
fine and sunny, I walked through 
some more likely lanes, and visited 
two Clover fields, this time with a 
net and collecting box. I was out 
two or three hours, and, during that 
time, saw no less than ten C. Cardui, 
most of which"*.! had a chance at 
1 > 
thougtfonly ‘three were captured. On 
the 29th I again visited one of the 
Clover fields, and there saw eight 
more, though I stayed but a little 
time ; having captured three of them 
I returned home. I did not go out 
again after them, or I might have 
been able to record many more cap- 
tures, the weather, during the whole 
week, being very fine. Most of those 
I took ( seven in all ) were in good 
condition. C . Cardui was, at that 
time, much more numerous than V. 
Atalanta, of which I did not see 
above six specimens during those two 
days; whereas Atalanta used to be 
very plentiful about here, before that 
fearful season of I860, which did 
more to exterminate the Lepidoptera 
in this neighbourhood than all the 
collectors in England could have done. 
Rev. CtENNEr.L Wilkinsox, Fulbech, 
Grantham. Nov. 3 rd, 1862. 
Emigration v Immigration, and vice 
versa and pro and con. — With refer- 
ence to what Mr. Gregson says, I will, 
myself, pass no opinion, one way or 
the other, but only remark on one of 
his observations that I think “sight” 
need not be necessarily supposed to 
have to do with the matter, for the 
ordinary first notion would, I imagine, 
be that any emigration of foreign 
insects would be caused by the con- 
tinuancc^of some steady wind in one 
direction, and not by a spontaneous 
desire, on the part of the insect, to 
visit another country. On the other 
hand I quoted, in my “History of 
British Butterflies,” the following 
curious account of a flight across the 
Channel of the small white Butterfly 
fPontia Napi) in vast numbers, 
during a perfect calm, — “ an extraor- 
dinary migration of this Butterfly 
from France to Dover, was witnessed 
on the 5th. of July 1846 ; and the 
‘ Canterbury Journal ’ recorded, at 
the time, that such was the density 
and extent of the cloud formed by 
the living mass, that it completely 
obscured the sun from the people on 
board the continental steamers on their 
passage, for many hundreds of yards, 
while the insects strewed the deep in 
all directions. The flight reached 
England about twelve o’clock at noon, 
and dispersed themselves inland and 
along the shore, darkening the air as 
they went. During the sea passage 
of the Butterflies, the weather was 
calm and sunny, with scarce a puff 
of wind stirring, but an hour, or so, 
after they reached ‘ terra firma,’ it 
came on to blow ‘ great guns ’ from 
the S. W., the direction whence the 
insects came. The gardens suffered 
from the ravages of their larvae, even 
at a distance of ten miles from Dover.” 
With regard to the occurrence, on 
the sea coast, of tho#specimens of 
Vanessa Antiopa mentioned by Mr. 
Read, I should have no doubt myself 
