HEMIPTERA: THE TRUE BUGS 



95 



Bark Lice or Scale Insects 



1. Look on apple twigs for the characteristic scales of the Oyster- 

 shell Scale. Pry up a scale and look on the under side with a lens. 

 In the fell, winter, or early spring you are likely to find many eggs. 



2. Examine various fruit trees, especially 

 peaches, plums, and pears, for the San Jose 

 Scale. If found, learn whether the trees 

 have been sprayed to destroy them. In 

 autumn the scales are likely to be found 

 upon the fruits. 



3. Examine other trees and shrubs for 

 other scale insects. In order to learn their 

 names, send such as you find to the Bureau 

 of Entomology, U. S. Department of Agri- 

 culture, Washington, D.C., with a letter 

 telling on what plant )'ou found them. 



Aphides or Plant Lice 



1. You generally can find these insects 

 with very little trouble. Look on the leaves 

 of apple or other fruit trees, or on willows or 

 other trees. Look also on the leaves of \ 

 flowers and vegetables. Do all the different 

 kinds of aphides you find look alike? 



2. In fall and winter look on the bark 

 of the willow branches and about the buds 

 of apple trees to find the winter eggs of the 

 aphides. Examine them through a lens and make a sketch for your insect 

 booklet. 



3. Many aphides live in gall-like modifications of the leaves. Make 

 sketches of such of these as you can find. 



4. Read one or more of these references : — 



American Insects, pages 171-176. Life Histories of American Insects, pages 

 209-347. 



Cicada emerging from 

 Nymph Skin 



