PLANT LICE. 201 
is bordered on both sides by a mixture of Clintons and Concords, 
yet working on the Clinton only. They appeared to work 
mostly on those twigs that were in the shade of some neighbor- 
ing trees. July 14th a further examination showed that more 
twigs were infested than before, some twigs were covered as 
far down as twelve or fifteen inches from the tip.” (French). 
This species is of a dusky brown or blackish color, legs 
greenish, marked with dusky. The winged forms have clear 
wings with brownish veins. 
Fic. 159—Nectarophora (Liphonophora) avenze Fab.—Winged viviparous 
female. After Smith. (See also fig. 137). 
They have as yet not been found in our state, and with our 
method of covering the vines every autumn with earth to pre- 
vent freezing, it is not likely that the winter egg will survive. 
Nectarophora destructor Johnson. (The Pea Plant-louse). 
This insect, unknown before 1898, has become very destruct- 
ive to late peas in some of the eastern states, and is spreading 
so rapidly westward, that it has already been reported from 
Wisconsin. It is wise therefore to be on the lookout for this 
new intruder. Yet this insect is an old offender, the N. pisz 
Kalt.; it was found in Minnesota many years ago on the 
roots of shepherd’s purse. 
