282 NATURAL HISTORY. 
the feather-scales of the Goat-moth. The delicate lines 
on them are not represented. It is these scales various- 
ly colored that give such beauty to many of the insects 
of this order. Some of the Butterflies are especially 
brilliant. 
478. The insects of the orders already noticed are 
mandibulate, § 392. This order, and the others which 
remain to be noticed, are haustellate, § 393. The Lepi- 
doptera stand at the head of the haustellate group, as 
the Coleoptera, or Beetles, stand at the head of the Man- 
dibulata. The haustellum, or sucker, by which the in- 
sect drinks up the nectar of the flowers, is composed of 
two long filaments, so shaped that, by joining them to- 
gether, they make a tube. You can see how accurately 
they must be made in order to do this. 
479. The larve of the Lepidoptera are caterpillars. 
They have three pairs of legs on the first three segments 
of the body; then they have some appendages called 
pro-legs, which are thick, short, fleshy tubercles, with 
minute hooks around the edge of the under surface of 
them: there are usually five pairs of these, four of them 
in rear of the true legs, and another pair on the last seg- 
ment of the body. In Fig. 219 are represented a leg 
and a pro-leg, greatly magnified. The curved claws on 
the six legs of the caterpillars enable them to climb up 
readily on the threads from which they so often hang, 
and the pro-legs are of great assistance to them in walk- 
