4 HOW TO TEACH BEETLES, BUGS, AND LOCUSTS. 
insect is, for many people are wont to consider other 
creatures as being insects. The spider, the scorpion, 
the sow-bug, the centipede, and the millipede, 
though they are commonly classed as insects, are 
not any of them true members of that class of ani¬ 
mals since they do not have six legs. 
A casual glance at a spider will at once convince 
any observer that this creature can not be classed 
with true insects, if the foregoing definition is cor¬ 
rect. His two-parted body and eight legs at once put 
him in another category. 
In general, any animal which has a three-parted 
body and six legs is an insect. 
