Setulose: clothed with fine seta or setulae.

s.e.x: 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.

s.e.xuparae: that generation of plant lice which produces the true s.e.xes.

Shade: a cloudy, ill-defined streak or band.

s.h.a.greened: 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 p.e.n.i.s: in Odonata, a median, hood-like piece between the hamules, under which the p.e.n.i.s 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 p.r.o.notum 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 a.n.a.l glands of some larva in Neuroptera.

Silk-glands: a pair of modified salivary glands in certain larva, mostly of Lepidoptera that secrete a viscid fluid which, on contact with the air, hardens into a silken fibre.

Silvicolous: living in moist, shady woods.

Simple, Simplex: without process, armature, or appendage of any kind.

Simple eyes: = ocelli; q.v.

Sinciput: in Coleoptera; that part of the vertex between the eyes.

Sinistrad: toward the left.

Sinistral: extending to or at the left from the median line.

Sinistro-caudad: extending obliquely from the left toward the tail.

Sinistro-cephalad: extending obliquely from the left toward the head.

Sinuate: cut into sinuses; applied to lines and margins with an in and out curve.

Sinuated: winding: with the edge scooped into sinuses.

Sinuato-convex: sinuate and convex.

Sinuato-lobate: sinuate and lobed.

Sinuato-truncate: truncated, with the margin sinuate.

Sinuous: undulating; curved in and out.

Sinus: a curvilinear indentation more or less profound: an excavation as if scooped out: a curved break in an otherwise straight margin.

Siphon: a tube-like mouth organ in certain insects: the breathing tube of a Culicid larva: any tubular external process or structure.

Siphonaptera: an ordinal name for insects which are wingless: mouth formed for piercing and sucking; saltatorial; transformations complete: the fleas = Aphaniptera; q.v.

Siphonata: = h.o.m.optera or, more specifically, plant lice and leaf hoppers.

Siphonets: see honey tubes.

Siphonophora: = Coccinellidae; the term is preoccupied in the Coelenterates.

Siphunculata: the sucking lice.

Siphunculus: the suctorial organ of a louse, contained within the tubule: in plant lice =honey tubes; q.v.

Situ (in): in its natural place or position.

Sixth longitudinal vein: in Diptera; = 1st a.n.a.l vein (Comst.).

Skeleton: the hard chitinous parts which externally (exoskeleton) or internally (endoskeleton) form a protective covering, or serve as points of attachment, to muscles and other soft organs.

Skippers: a popular term for Hesperid b.u.t.terflies: the dipterous larva sometimes found in cheese and other provisions.

Slaty: very dark blackish gray with a reddish tinge [neutral with a little Indian red].