Fig. 23. Feeding. 
find at least one or two with wings, for there are occasional 
individuals among plant lice that are winged. If you find them, 
you will notice that there are two pairs of wings held lightly over 
the body edgewise, one pair being much longer than the body, 
and all of them being delicate, 
transparent membrane (see Fig. 
22). The body is more slender, 
and all the parts have more black 
coloring upon them than the wing¬ 
less form. There is no other 
apparent difference between the winged and the wingless forms. 
The winged form is most likely to be a female. So are all the 
wingless ones. When walking, its antennas are thrown forward 
instead of reposing back over the body, where the wings are proudly 
carried. This form, walking about, reminds one of a peacock 
strutting about with its gorgeous tail. If you will observe one 
awhile, you will see it stop in its march, raise its head into the 
air, its body perpendicular, spread the four wings broadly over the 
surface on which the insect is standing, and then gracefully 
readjust them to their usual position. 
These winged females are an essential factor in the propaga¬ 
tion of the species, for when a plant becomes densely populated, 
the winged forms fly away to new plants and found new col¬ 
onies. 
But let us observe other facts about the insect. The eyes 
project boldly from the small head. They are black, and point 
in opposite directions. Remember the fact about the eyes of all 
insects, that they are compound, that is, many eyes in each of 
the two bundles; in this case, not so many by considerable as 
in the case of the house fly. 
The exact number is about 
one hundred in each bundle. 
The antennae are two long 
hairs proceeding from the 
head, thrown gracefully back 
over the body when the insect 
is not in motion (see Fig. 23). 
They are longer than the 
body, and jointed. A good glass will reveal about seven joints. 
When the insect is walking, these antennae are thrown forward 
Fig. 24. Walking. 
3 
