MOTIONS OF INSECTS. 279 
wooden legs. The anterior leg is attached to the under- 
side, but towards the head, of the first segment of the 
body. It is long and cylindrical, placed perpendicularly 
or obliquely, according to the different movements the 
animal gives it, and terminates in two feet, armed at 
their extremity by a coronet of long moveable hooks. 
These feet, like the tentacula of snails, are retractile 
within the leg, and even within the body, so that only a 
little stump, as it were, remains without. The insect 
moves them both together, as a lame man does his 
crutches, either backwards or forwards. The two pos- 
terior legs are placed at the anal end of the body. They 
are similar to the one just described, but larger, and 
entirely separate from each other, being not, like them, 
retractile within the body, but always stiff and extended. 
These also are armed with hooks. In walking, this larva 
uses these two legs much as the caterpillars of the moths, 
called Geometre, do theirs. By the inflection of the 
anus it can give them any kind of lateral movement, ex- 
cept that it can neither bend nor shorten them, since like 
a wooden leg, as I have before observed, they always 
remain stiff and extended*. Lyonet had observed this 
larva, or a species nearly related to it; but he speaks of 
it as having four legs, two before and two behind. 
Probably, when he examined them, the common base, 
from which the feet are branches, was retracted within 
the body”. 
Generally speaking, however, in these apodous walk- 
ers the place of legs is supplied by fleshy and often re- 
tractile mamille or tubercles. By means of these and a 
® De Geer, vi. 395—. Pratre XXIII. Fic. 7. Foreleg, a. Hind- 
legs, bd. b Lesser Z. i. 96. note TF. 
