The Collaborative International Dictionary of English v.0.48:

Pseudopupa \Pseu`do*pu"pa\, n.; pl. L. Pseudopup[ae], E.
   Pseudopupas. [NL. See Pseudo-, and Pupa.] (Zool.)
   A stage intermediate between the larva and pupa of bees and
   certain other hymenopterous insects.
   [1913 Webster]