Entomology definition of Tegulae: small, more or less cup-like scales at the
base of primaries in many insects; specifically in Hymenoptera:
in Lepidoptera, = the patagia or shoulder tippets; but the
homology is disputed; also applied to the lappet-like pieces
forming the collar: in Diptera, the alulae, q.v.: the latter use
is unfortunate and should be abandoned; the first definition
should limit the use of the term: see aileron.