77 
en gathered in May in large numbers on the roots of corn; these, 
though in the pupa and larva state, showed so clearly the marks and 
her characteristics, mentioned by Mr. Walsh, that there was no mis- 
It 1 !! tberefore'quite certain that this species is not confined to any 
ie part of the plant but infests the greater portion of it, at least its 
osf vital oarts! and when very abundant as it is m Mme cases.does 
■rious iniury. The root variety appears to retain the pupa form toi 
,me time, and I think it more than probable that many of them 
ever acquire complete wings, although the wing cases are formed. 
I add here a description of specimens found on the tassels. 
Wingless individuals. The full grown are of an aPP^en color 
iroughout, except the front of the head which is dark honey-tubes 
lort "cylindrical, not reaching quite half way to the tip of the ab- 
omen, deep black with small black spots surrounding the base Body 
llintical or slightly ovate in outline and of but moderate width , the 
ery young have the sides nearly parallel; antenn© scarcely half tne 
3 ngth of the body, dark-brownish, seven-jointed, third joint the long- 
st C about equal in length to the fourth and fifth united, fourth, fifth 
nd sixth nearly equal in length, seventh .a little longer than the 
ixth * whole antennse having a few scattering hairs A stripe run 
E?along the margin at each side of the abdomen of a little darker 
hade than the central portion; legs dusky, darker at the joints and 
ips. 
Winged individuals—Head and thorax of a shining black ; abdomen 
rale greenish yellow, dotted along the lateral margin with black 
loney-tubes black, similar to those of the wingless mdividuais legs 
isky pale at the immediate base ; antennae about half the length o 
ie body ; beak very short, scarcely reaching beyond the base of the foie 
gs. Wings erect in repose, of usual form, third discoidal vein twice 
rked ; transparent, veins slender, slightly dusky, the stigma elon- 
ite fusiform and rather slender ; the sub-costal vein for some distance 
om the base recedes somewhat from the costal, and then at about 
vo-thirds the distance approaches the costa; the firsti vein abou 
iree times as far from the second at the tip as it is at the base , t e 
>cond is slightly farther from the base of the third than the base o_ 
first. The second fork arises near the apex of the wing; the 
figmatic vein curves somewhat shaiply at the base, and then is 
early straight to the tip. > , 
As a general rule we may know that Plant-lice are on a plant by 
seing ants running hurriedly up and down it. It is chiefly b> 
matching f6r these that I discover aphides when searching foi them, 
iceasionallv I find them before the ants appear to have noticed them, 
»ut this is seldom the case. 
Remedies—It is not a difficult thing to destroy Plant-lice when they 
.re on low shrubbery and not spread over too large an area tumi- 
;ating with tobacco smoke, fumes of sulphur, etc., is an effectual ren - 
idv when it can be carried out, but this would be impracticable if we 
ittempt to apply it to a cornfield. A small patch of sweet coin may 
>e, perhaps, profitably preserved by this method. 
