The Collaborative International Dictionary of English v.0.48:
Pupal \Pu"pal\, a. (Zool.) Of or pertaining to a pupa, or the condition of a pupa. [1913 Webster]WordNet (r) 3.0 (2006):
pupal adj 1: of the insects in the chrysalis (cocoon) or post larval stage; "the pupal stage"