In the Cyclorrhapha on the other hand, in which the actual pupa is concealed within the hardened larval skin, the imago escapes through a circular orifice formed by pushing off or through the head end of the puparium.
Pupa incompletely obtect or free, and enclosed in the hardened cuticle of the last larval instar (puparium).
Cuticle of pupa or puparium splitting longitudinally down the back, to allow escape of imago.
The pupa either shows the appendages of the perfect insect, though these are encased in a sheath and adherent to the body, or else it is entirely concealed within the hardened and contracted larval integument, which forms a barrel-shaped protecting capsule or puparium.