the natural Distribution of Insects and Fungi. 
67 
These are the Aprera of Linnæus, and comprehend three 
classes, viz. Crustacea, Arachnida, and Ametabola, which 
would be termed Radii by M. Fries. 
2. True Insects, being all subject to that kind of metamorphosis 
which has a tendency to give wings to the perfect or imago 
state, but never more than six feet. 
These are the Prrrora of Aristotle, and should, according 
to M. Fries, be termed the Centrum of Annulose Animals. 
** Sed centrum abit semper in duas series," and consequently 
we find that the 
PTILOTA 
T S 
gs 
either become by metamorpho- 
sis organized for mastication 
in their perfect state, and are 
the 
MANDIBULATA of Clairville, 
which comprise the following j 
orders, viz. 
1. 
Metamorphosis obtect. 
Larvæ eruciform. 
TRICHOPTERA? 
O 
Metamorphosis incomplete; or 
. coarctate. 
Larvæ apod or vermiform. 
HYMENOPTERA. 
x2 
— 
or become by metamorphosis 
organized for suction in their 
perfect state, and are the 
HAUSTELLATA of Clairville, 
which comprise the following 
orders, viz. 
1. 
Metamorphosis obtect. 
Larvæ eruciform. 
LEPIDOPTERA. 
2. 
Metamorphosis incomplete, or 
coarctate. 
Larvæ apod or vermiform. 
DIPTERA. 
3. Meta- 
