418 INSECTS INJURIOUS TO VEGETATION. 



directions, drawn up by Mr. Haggerston himself, for the pre- 

 paration and use of this simple and cheap application, may 

 be found in the " Boston Courier," for the twenty-fifth 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 eftectually destroys many kinds of insects ; and 

 he particularly mentions plant-lice, red spiders, 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 Tet- 

 tig-onia, 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 " Natm-al History of the Slug- worm," 

 which was printed in Boston, in the year 1799, by order of 

 the " Massachusetts Agricultural Society," and obtained the 

 Society's premium of fifty dollars and a gold medal. As my 

 own observations on this insect agree perfectly 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 Linnasus, an insect found more commonly on the pear-tree 

 in Europe than on the cherry, although 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, there- 

 fore, is now called Selandria [Blennocampa) JEthiops ; and a 

 good account of it, by Mr. Westwood, may be found in the 

 thirteenth volume of " The Gardener's Magazine." It is pos- 

 sible that our slug-fly may have been imported from Europe, 



