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Puparium opening by an anterior “lid.”

Cuticle of pupa or puparium splitting longitudinally down the back, to allow escape of imago.

This affords a very satisfactory method of mounting, particularly as the different sexes may be brought together on the same bit of pith, or the adult and puparium in Diptera, as shown at Figure 101.

Tachinid Parasite: a, fly; b, puparium, magnified.

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.