CHAPTER VI. 
SOME INSECTS CLASSIFIED. 
The Bluebottle Fly. Expose a piece of fresh meat 
in a sunny place for a short time and these flies will 
collect on it. Capture some of the flies and observe 
them carefully. 
How does the fly feed? You can study the mode 
of feeding of the common house-fly by fastening a piece 
of sugar toa slide and placing it under a microscope 
in a place where flies are plentiful. 
What kind of food does a common house-fly prefer ? 
How do you know ? 
Devise an experiment for determining what kind of 
food the house-fly particularly likes. In experiment- 
ing with foods try sugar, honey, salt, pepper, water, 
and other substances. 
Does sight or smell seem to guide the fly to its food ? 
How does a low temperature affect flies? How do 
you know? 
How do the flies make their buzzing ? 
Keep a few bluebottle flies under a tumbler with a 
bit of meat until eggs are deposited. Remove the flies 
and watch the development of the eggs. Does the fly 
have complete or incomplete metamorphosis ? 
How many wings has the fly ? 
How many segments has the fly’s abdomen ? 
See if you can find a winglet behind the wing. 
Using a lens, do you find a pair of balancers behind 
wing and winglet ? 
Is one of the segments of the thorax larger than the 
rest ? 
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