|, This has occasionally been found useful for the destruction 
;rue army worm. One farmer in Mason county, who noticed 
3 grass worms were extending their ravages rapidly from 
jtral area in which he first noticed them, believed that he de- 
J the brood and prevented further injury by plowing under 
' sted area and rolling it heavily immediately thereafter. If 
3ition to migration, like that of the army worm, is apparent, 
i :ch of the host may be arrested by measures which have 
and more or less efficient in the case of the last named in- 
tat is, a furrow may be plowed across the line of their 
when the worms collecting therein may be destroyed by 
y a log along the furrow. If their appearance is easily de- 
vhile they are still small, it might not be unprofitable to 
them with Paris green or other form of insect poison, but 
instances it will doubtless be less expensive to resow the 
than to attempt the somewhat doubtful remedies here pro- 
1 
7. The Grain Leaf-Hoppers. 
Order Hemiptera. 
i, 
Family Jassid.e. 
at number of species of minute leaf-hoppers are found upon 
grain, usually inflicting only insignificant or temporary 
I, even if their effect is finally appreciable; but a few species 
and by us last summer abundant enough in fields of growing 
in May and June, to constitute a menace to the crop where 
ditions were not otherwise entirely favorable to its growth, 
these, confined to the cereal crops as far as our observations 
j r ere new to science; while a third, wide spread, occurring in 
dilations and upon a considerable variety of plants, is a 
l species, described originally by Say under the name of 
I rroratus. 
irst two are closely allied to Jassus inimicus, Say, described 
* the describer of that species adding the remark that it is 
depredate, in the larva state, on the roots of wheat in Yir- 
Cicadula nigrifrons, n. s.t 
(Plate V. Fig. 3.) 
>derately slender, yellowish green species, with four black 
,/t the anterior margin of the vertex. The head is sublimate, 
rounded in the middle, its antero-posterior diameter next 
5 being about three-fourths its median diameter. Its color 
yellow, irregularly mottled with white, with an arc of four 
r black points at its anterior margin, the outer of these just 
>lete writings, Vol. II, p. 382. 
ugh this species differs by characters commonly esteemed generic from the 
md from any other genus known to me, yet in the present state of the generic 
ion of our American Homoptera I have not thought it best to multiply descrip- 
enera, but content myself with indicating the distinctive characters in the 
sompanying. 
