26 Pik FS ey, 
London it has been fought with moft fuccefs in the Batterfea Fields, 
or on thofe banks which abound with aquatic plants, between Batterfea 
and Richmond; the marfhes in the vicinity of Deptford and Rother- 
hithe have been yet more productive ; we do not |.owever underftand 
that any have been taken this feafon about the metropolis. 
The very fingular manner in which this Caterpillar conftructs its 
web, deferves particular notice: previous to its transformation from 
the Larva to the Aurelia, it quits the tender plants which afford nou- 
rifhment, and retires to thofe, better calculated for its protection, in 
its defencelefs ftate; its choice is generally the Scirpus Lacuftris 
(Bull Rub), or the foutelt plant that is near, if its leaves are rufhy 
and ftrong. Its firft procefs is to make a deep incifion acrofs the leaf, 
which it effects with little Jabour, as its mouth is well armed for the 
purpofe; the upper part of the leaf being thus deprived of its fupport, 
inftantly becomes dependent; the Caterpillar embraces the two fur- 
faces of the fractured leaf, and weaves its web between. ‘The web is 
of an exquifite texture and whitenefs, and bears great refemblance to 
the webs of fome fpiders that frequent watery places. 
The Caterpillars are found in June and July, the Fly in Auguft. 
PLATE. 
