BURROWS IN THE EARTH. 
63 
black hairs are present, but the warts are colourless : the 
head is clear as glass, and the two black eyes, so conspicu- 
ous in the egg and newly-hatched grub, are again visible. 
In about twenty minutes the black spots begin to appear, 
and in about four hours become as distinct and the head as 
black as before the moult. When the grub has regained 
its colour, it again begins to eat, and eats away night and 
day without stopping, for four or five days more. It then 
sickens again for its last moult, and this is performed in 
the same way as the first : but this time the spots, warts 
and bristles are cast with the skin and appear no more. 
The grub is now of a pale delicate green colour, except 
the yellow patch near each end, which it still retains. It 
has now done with eating : when hard enough and strong 
enough after this last moult, it marches to the stem of the 
bush, and quietly descends till it reaches the earth : some- 
times it crawls along a hanging branch and drops from the 
extremity. 
The object of gaining the earth is to burrow beneath its 
smface ; and as soon as the grub once feels the soil, he 
begins forcing his way into it head foremost, after the 
fashion of a mole. When he is deep enough to answer his 
purpose, the depth varying, by the way, from two to eight 
inches, according to the hardness or lightness of the soil, 
he makes a little oblong cell in the earth, and therein spins 
or constructs a tough black cocoon, attached all round to 
the walls of the cell : although I say spins, the material he 
uses is not silk or thread, but something between silk and 
glue, or what we might suppose to arise from the harden- 
ing of fluid silk, an illustration rather of the uncouthest, 
but for want of a better, it must go. In this cocoon or 
case he disposes himself to await the change to a chrysalis, 
and soon after to a fly. 
