FOR WAGGONER’S BIOLOGY 
73 
I. The Adult. Place the specimen on white paper and study 
under a lens. What are its size and general form? What parts of 
the body do you find? Note the body covering. What is its na¬ 
ture? What are the number and character of the legs? Of the 
wings? Compare the wings with those of a butterfly; with those 
of a beetle. Examine a head which has been mounted, face ” up, 
under low power. Note its covering. Examine the compound 
eyes. What is the character of the mouth parts? Draw the head 
as you see it. Examine a foot which has been mounted under low 
power. Draw it, showing the nature of its covering and the parts 
of which it consists. How is a fly fitted to carry disease germs? 
What food habits has it which make it a menace to health? (See 
Waggoner, Figs. 207 and 208.) 
II. The Egg. (House fly eggs may be found in manure.) Study 
one under a lens. What are its size, shape, and color? Draw an 
egg. 
III. The Larva (Maggot). (The larvae also may be found in 
manure or in decaying waste matter.) What are its color, size, 
and shape? Are legs present? What is the food of the house fly’s 
larva? Draw a larva, using the same scale as you did for the egg. 
IV. The Pupa. (Find the pupae in manure or in materials 
near by.) Study under a lens. Compare with the larva as to 
shape, size, and color. Do you find mouth parts? Does the 
house fly eat while in this stage? What developments take place 
during the pupal stage? Draw a pupa, using the same scale as 
for the egg. 
EXERCISE 73 
A SURVEY OF BREEDING PLACES OF FLIES 
AND MOSQUITOES 
I. Field Work. Divide the class into groups, one group each for 
certain city blocks or areas which adjoin the school. After the 
assignment of these areas, each group may make a map showing 
