M PUPA CASES. 
ever are not glued together, but resemble 
a little hank of silk ; and when com- 
pleted the caterpillar can just slide its 
head and body underneath as far as the 
fifth ring. This species feeds on fennel. 
Lucy. But if the band should be 
too tight, poor thing, what happens 
then, after all its labour ? 
Mother, If too tight, the cater- 
pillar cannot get underneath, and if too 
\vide, it falls through ; in either case, it 
never completes its change, but dies in 
the caterpillar state, not being provided 
with silk enough to make a second band. 
Some kinds make only a little mat, in 
which they fasten their tails ; suspend- 
ing it from the small twigs on the stems 
of trees. 
Lucy. But this brown one in the box 
does not seem to have been hung from 
any thing ? 
Mother, There are many species, 
which do not spin at all ; of these, 
some retire into crevices in walls or 
trees, but the greater number creep un- 
