LECTURE IX. 
99 
By the time it is fully grown the natural fall oftlf© 
nut takes place, and the animal, not at all injured 
by the shock, creeps out at the circular hole which 
it has previously prepared, and immediately bur- 
rows under ground, where, after a certam time, it 
casts its skin and commences chrysalis, or pupa, 
in which state it remains all winter, and till the 
beginning of the following August, when it 
emerges from its concealment and appears in its 
complete form. Its colour is a dull, uniform 
brown. 
The order Coleoptera or the sheath-winged 
tribe contains a great many other very curious 
genera, both of large and small size, but the 
limits of our Lecture will not allow us to parti- 
ciilarize more than a few examples of each order 
of insects. 
I shall therefore now pass to the '^second Lin- 
n^ean order, called HeimpterOy or as it were Half- 
winged insects ; for in this order the wing-sheaths 
aiie of a tough or leathery constitution at their 
upper part, and soft, or membranaceous at the 
low6r, and the real or under-wings are often of 
grbdt size, and pleated longitudinally in the ^man- 
ner of a fan. This order contains all the in- 
