528 
HYMENOPTERA. 
application, may be found in the ‘‘ Boston Courier ” for 
the 25th of June, 1841, and also in most of our agricultural 
and horticultural journals of the same time. The utility of 
this mixture has already been repeatedly mentioned in this 
treatise, and it may be applied in other cases with advantage. 
Mr. Haggerston finds that it effectually destroys many kinds 
of insects ; and he particularly mentions plant-lice, red spi¬ 
ders, canker-worms, and a little jumping insect which has 
lately been found quite as hurtful to rose-bushes as the slugs 
or young of the saw-fly. The little insect alluded to has 
been mistaken for a Thrips or vine-fretter; it is, however a 
leaf-hopper, or species of Tettigonia^ and is described in a 
former part of this treatise. 
According to the plan to which I have found it necessary 
to limit this work, only one more species of saw-fly remains 
to be described. Of the habits and transformations of this 
insect the late Professor Peck has given us an admirable 
account, under the title of a “ Natural History of the Slug- 
Worm,” which was printed in Boston, in the year 1799, by 
order of the Massachusetts Agricultural Society, and ob¬ 
tained the Society’s premium of fifty dollars and a gold 
medal. As my own observations on this insect agree per¬ 
fectly with those of Professor Peck, in the following remarks 
I have merely abridged and condensed his ‘‘ Natural History 
of the Slug-Worm,” a work now out of print, and rarely 
to be met with. It will be proper to premise that Professor 
Peck was inclined to believe this slug-fly to be a variety of 
the Tenthredo Cerasi of Linnaeus, an insect found more com¬ 
monly on the pear-tree in Europe than on the cherry, al¬ 
though it has a specific name derived from the latter tree. 
Most naturalists now reject the name given by Linnaeus 
to the slimy grub of the pear-tree, because it is not strictly 
correct, and substitute a specific name imposed upon it by 
Fabricius. The European insect, therefore, is now called 
Selandria (^Blennocampa) ^thiops ; and a good account of 
it, by Mr. Westwood, may be found in the thirteenth volume 
