No. 150.] 
337 
ry of this species, is given in this work, and its generic place, upon 
which point Mr. Herrick, Latreille and others had intimated doubts, 
is correctly settled. 
The numerous agricultural periodicals of our country, abound 
with notices of this insect, more or less extended and valuable. To 
specify these notices in detail, at least as respects some of these pe¬ 
riodicals, would require a reference to almost every number issued. 
Wherever important facts are derived from these sources, in the 
course of thisessav, they are accompanied by a particular acknowl¬ 
edgment in each instance; an additional reference in this place, 
is therefore deemed unnecessary. 
We close this section of our subject, with a condensed view of 
the depredations of this insect in different parts of our country, 
during a few of the past years; the materials for which, are fur¬ 
nished us, in those valuable documents, the yearly reports of the 
Commissioner of Patents. 
In the year 1812, the ravages of the Hessian fly would appear to 
have been quite limited. Pennsylvania suffered the most severely. 
The wheat crop in this State is estimated to have been twenty per 
cent less than it was the preceding year, and of four different causes 
that produced this diminution, the fly is placed first. Some parts 
of Maryland, and also of Ohio, were visited by it. In the latter 
State it appeared to be increasing so much, that serious apprehen¬ 
sions were beginning to be felt respecting its future ravages. 
In 1S43, it was so abundant in western Pennsylvania in June, 
that it was thought it would diminish the crop twenty-five per cent. 
Through Maryland, and the great wheat-growing valley of Virginia, 
it was noticed at the same time as committing great havoc in many 
fields, and threatening a very decided failure in the crop ; at har¬ 
vest, however, the yield was found to be much better than was an¬ 
ticipated. In Ohio it was less injurious than in the preceding year. 
Upon some parts of Long Island it was observed, but in limited 
numbers. 
In 1844, it seems to have been much more destructive than in 
either of the preceding years, and to have made its appearance pro- 
[Assembly, No. 150.] 24 
