202 METHOD OF COLLECTING 
brass or iron wire-cloth to prevent the escape of the — 
caterpillars. When they have fed their accustomed 
time, and attained maturity, they will dig them- 
selves a recess under the surface of the soil, and 
there undergo their change into a chrysalis. In this 
condition they will continue, till transformed by the 
genial influence of the sun. 
«Some years,” says Mr Samouelle,* ‘“ produce 
a greater quantity of caterpillars than others ; and 
keeping each kind by themselves would require an 
immense number of cages, and much time in chan- 
ging the food, and paying a proper attention to them. 
It is a common practice to have a breeding cage of 
larger dimensions, by which means a great number 
of caterpillars may be fed in one cage, in which a 
variety of food may be put, but must be taken away 
and replaced with fresh plants, every second or 
third day, for this tends greatly to the obtaining 
of fine specimens of the perfect insect.” 
OF PUPAE. 
The skin of the pupz generally retain their 
original shape and colour, as before the insect burst 
from its confinement. No preparation is therefore 
necessary, and it should only be fixed on a card, as 
above directed for the caterpillar. | 
* Samouelle’s Entomologist’s Useful Compendium, p. 310. | 
