slender, gradually tapering to a tip.

Setarious aristate: the dipterous antenna when the arista is simple.

Setiferous: = setigercus; q.v.

Setiform: in the form of a bristle or seta: when a slender short bristle
arises from a thicker basal joint.

Setigenous: the hypodermal cells that give rise to setae.

Setigerous: bearing setae or bristles; e.g. punctures.

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 sub-costa.

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.

Shard: a chitinous sheath or elytron.

Sharp: with a pointed tip or thin edge; opposed to blunt.

Sheath of penis: in Odonata, a median, hood-like piece between the
hamules, under which the penis is folded when not in use.

Shin: = tibia; q.v.

Short sector: in Odonata, = media 4 (Comst.).

Shoulder: loosely applied to an obtuse angulation; more generally to
the humeral angle of fore wings or elytra: the anterior angles of
thorax in Lepidoptera; the angles of prothorax in Heteroptera: the
lateral angles of metazona of pronotum in Orthoptera.

Sialisterium: a salivary gland.

Side: the lateral margin of the body.

Side piece: in genitalia of male Culicids the main lateral part of the
clasping organ or basal segment of clasp.

Sides of thorax: in Odonata, includes the pleura of meso- and meta-
thorax, less the meso-episterna.

Sienna: a brownish orange [brown ochre].

Sigmoid: shaped like the Greek letter sigma, or English S.

Signate -us: = with marks or spots; see notate.

Signature: a colored blotch of any size or shape.

Silaceous: = ochraceous.

Silk: the hardened salivary secretion of certain larvae, mainly of
Lepidoptera. similar material is produced by anal glands of some larva
in Neuroptera.

Silk-glands: a pair of modified salivary glands in certain larva, mostly
of Lepido