26 HOW TO TEACH BEETLES, BUGS. AND LOCUSTS. 
Some species have such powerful mouth-parts as to 
enable them to bore through the shells of nuts and 
lay their eggs there. 
Specimens of weevils in all these stages should 
be obtained and preserved in formaldehyde or 
alcohol. To obtain the insect imagos, spread a 
sheet or other large cloth on the ground under an 
infested tree, and shake or thump it vigorously. 
The weevils will fall to the ground and feign death. 
Larvae will be found in the stung fruit, and if sorrle 
of these be placed on damp soil in a box, the full- 
grown larvae will creep out and bury themselves in 
the soil to pass their pupa stage. Specimens of 
this sort should also be preserved with the larvae 
and perfect beetles. 
SOME STRANGE BEETLES. 
In concluding this portion of the work let us con¬ 
sider a few remarkable beetles. 
i. The firefly. This is a very inconspicuous 
little beetle having an oblong body of dark dull 
yellow and black. By day it flies little, but spends 
most of its time resting in the shade of bushes and 
low plants. Some species never become completely 
developed into imagos, hence they are called “ glow¬ 
worms.” 
Just what causes the light of these insects, has 
not been satisfactorily determined. The majority 
of scientists believe that this light is due to the 
oxidation of some gas emitted by the spiracles or 
