Stigmata: the spiracles: also applied to the two spots, orbicular and reniform, in the cell of the primaries of certain moths.
Stigmatal line: in caterpillars, = spiracular; q.v.
Stigmatiferous: applied to processes or structures bearing spiracles or stigmata.
Stimuli: the small acute spines on some larva, especially wood-borers
Sting: the modified ovipositor in aculeate Hymenoptera.
Stipes: the foot-stalk of the maxilla; articulated partly to the head, partly to the cardo, and bearing the movable parts: modified into a piercing structure in some Diptera and into a lever for flexing the proboscis in others.
Stipitate: supported on a stalk or pedicle.
Stipites: the outer pair of forceps in male genitalia of aculeate Hymenoptera see sagittae.
S. T. line: sub-terminal line; crosses the primaries of many moths just before the outer margin.
S. T. space: the area between the t.p. line and s. t. line in moths.