SOME INSECTS CLASSIFIED. 61 
How do the mouth- parts compare with those of a 
butterfly ? with those of a grasshopper ? 
Do you find toothed mandibles ? 
Are the segments of the thorax of equal size ? 
Are the legs strong or weak ? 
How does the abdomen compare with that of the 
grasshopper ? 
How many segments has the abdomen ? 
Do you find spiracles ? 
Examine one of the larvz and tell how it differs from 
the imago. 
Examine with particular care the mouth of one of 
the larve. 
Summary of Drawings. (a) The imago as seen 
from above X 2. 
(6) One antenna, magnified (microscope). 
(c) Side view of mask of larva, magnified (micro- 
scope). 
(2) Side view of larva x 3. 
Mud-wasps can be easily collected in almost any 
locality. Obtain specimens and write resemblances 
and differences for wasp and beetle. 
Squash-bug. Write resemblances for squash-bug 
and potato-beetle. 
Resemblances. The number of insects is so great 
that it is practically impossible for one person to learn 
their names, to say nothing of being able to know their 
habits and structure. 
When, however, one has become familiar with only 
a limited number of forms, certain resemblances thrust 
themselves upon the attention. These points of like- 
ness are-of great assistance in extending our acquaint- 
ance, for when we know one insect well we have some 
knowledge which applies to all. If we hear of a new 
insect we at once suppose that it has those peculiarities 
which we have found common to all insects we know, 
and in so supposing we are not likely to be mis- 
taken. 
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