334 Nectar From Plant Lice. 
branches of our willows, which they often entirely cover, 
and thus greatly damage another tree valuable for both 
honey and pollen. Were it not that they are seldom numer- 
ous two years in succession, they would certainly banish 
from among us one of our most ornamental and valuable 
honey-producing trees. These are fairly thronged in Sep- 
Fic. 141. 
Fenale Male, 
Fic. 142. 
Female, Male, 
Apple Tree Aphis, muck magnified, 
tember and October, and not unfrequently in spring and 
summer if the lice are abundant, by bees, wasps, ants, and 
various two-winged flies, all eager to lap up the oozing 
