Setiparous: producing hair or sets.
Setireme: the hairy, oar-like legs of aquatic insects.
Setose -ous: bristly or set with bristles.
Setula: a small stiff bristle or seta: in Diptera, the small thorn at the end of the subcosta.
Setulose: clothed with fine seta or setulae.
Sex: as a number, six: the physical difference between male and female: usually indicated by the sign of Mars (?) for male, and Venus (?) for female; workers or undeveloped females have the sign of Venus without the cross line, or a combination of the two others.
Sexuparae: that generation of plant lice which produces the true sexes.
Shade: a cloudy, ill-defined streak or band.
Shagreened: a surface roughened with minute tooth-like projections.
Shank: = tibia; q.v.