I ?14 [Assembly 
robust than the first and third, thickest at base and gradually more slender thence 
to the tip, basal portion gently curved, the remaining part straight, its apex nearer 
that of the third than that of the rib vein, about the same distance from the apex of 
the rib vein that the apex of the third vein is from that of the second. Marginal vein 
robust and black from the base to the stigma, very slender and black along the outer 
margin of the stigma, slender and brown from the stigma around the tip of the wing 
and along its inner margin to the apex of the first vein, thence robust and black, 
gradually becoming brown towards the base, stigma dark smoky brown, oblong, its 
opposite sides nearly parallel, abruptly converging to an acute point at each end, the 
basal end more acute than the apical, and slightly attenuated. Lower wings more 
clear and hyaline, marginal vein and outer filament of the rib vein pale brown, inner 
filament black and very gradually diverging from the outer, both filaments undu¬ 
lated beyond the base of the second vein; the two diseoidal veins blackish, the first 
slightly undulated, its apex the same distance from the apex of the second that this 
is from that of the inner filament of the rib vein. 
An abnormal variety has fallen under my notice in one instance, in which the apex 
of the fuurth vein of the right wing was slightly forked. 
When a tree ceases to grow with its usual vigor, and its leaves 
are of a paler and more yellow hue than usual, and no borers in 
the trunk, or other obvious cause of disease can be discovered, 
the presence of this blight upon its roots may be suspected, and 
the earth should be removed from them sufficiently to ascertain 
whether excrescences such as have been above described are 
formed upon them, and if discovered, it will be well to clear 
away the earth from around them as much as can conveniently 
be done, and pour strong soapsuds upon them, /hat it may satu¬ 
rate the crevices in the excrescences, for there is little doubt that 
every insect that is reached and wetted by this solution will im¬ 
mediately perish. And ashes should be freely mingled with the 
soil with which the roots are covered. It is probable that by a 
resort to these measures an affected tree cap in most instances be 
cured. 
It is chiefly in nurseries, upon the roots of young trees taken 
up to be transplanted, that the blight will be detected. In con¬ 
sequence of it thousands of trees in our country have undoubted¬ 
ly been thrown away. But there is probably no necessity for 
rejecting such trees. If the root be dipped in soap suds, unless 
the lice upon it are a much hardier race than their kindred which 
dwell upon the leaves and twigs of trees, they will at once be de- 
