In the higher Lepidoptera the pupa is immovable, and the imago, after the ecdysis of the pupal cuticle, must emerge.
Both larv were active, but the moulting one had now completed its ecdysis.
ecdysis, ek′di-sis, n. the act of casting off an integument, as in serpents.
The first ecdysis occurs after five days, and with this there appears quite suddenly a very complicated pattern.
After the second ecdysis the marking and colouring only undergo change with respect to the eye-spots.
Four days later, after the fourth ecdysis, the dimorphism becomes a polymorphism.
After the fifth ecdysis the Nauplius appendages undergo a rapid atrophy.
The first ecdysis occurred after 5–6 days, the length of the caterpillars being from nine to ten millimeters.
At the third ecdysis several new features appear in the cephalic region, which becomes more prominent in the succeeding stages.
At the second ecdysis there appears at its side a rudimentary shell-gland.