Sternum -a: the breast: the middle portion of the under surface of thorax, between the coxal cavities. Stethidium: the trunk: the entire thorax with all its appendages. Stigma: a spiracle or breathing pore: a dense, often discolored portion of the costal margin of a wing, usually at the end of the radius; see anastomosis: in Diptera, a colored wing spot near the tip of the auxiliary vein: in Lepidoptera, the specialized patch of black scales on the primaries of Hesperidae. 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. Stirps: a stock or stem: a division of classification similar to super-family: not used at present. Stoma -ata: a breathing pore or pores:= stigma; q.v. Stomach: that portion of the alimentary canal, immediately following the gizzard and preceding the ileum, into which most of the digestive juices are poured = chylific ventricle. Stomatodaeum: that invagination of the ectoderm that forms the mouth, pharynx, oesophagus, crop and gizzard. Stomatogastric: that system of nerves and ganglia, lying along the dorsal and lateral surfaces of gullet and crop. Stomatotheca: that part of the pupa covering the mouth structures. Stramineous -eus: straw yellow [pale clay yellow]. Strangulate: constricted, as if by bands or cords. Stratified: arranged or made up in layers. Strepsiptera: twisted-wing: an ordinal term proposed for the parasitic Stylopidae, now ranged as a family of Coleoptera = Rhipiptera. Stria: in Coleoptera, a longitudinal depressed line or furrow, frequently punctured, extending from base to apex of elytra: in Lepidoptera, a fine transverse line: in general, any longitudinal impressed line. Striate -ed: marked with parallel, fine, impressed lines; or, in Lepidoptera, with numerous fine transverse lines. Stridulate: to make a creaking noise by rubbing together two ridged or roughened surfaces. Stridulation: a creaking sound produced by rubbing together two striated or otherwise roughened surfaces: the act of stridulating or the noise produced by it.