Jabot: the crop; q.v.
Janthine: violet colored.
Jaw-capsule: contains the mouth structures in those dipterous larvae in which the head is differentiated.
Johnston's organ: a complex nervous structure in the basal joint of dipterous antennae.
Joint: a segment or part between two incisures: an articulation.
Jubate -us: fringed with long pendent hairs.
Juga: the lateral anterior lobes of the head of a Heteropteron; each side of the tylo.
Jugatae: that series of Lepidoptera in which there is a jugum instead of a frenulum to unite the wings in flight.
Jugular: of or pertaining to the throat.