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EXPLANATION OF TERMS 



Setulose: clothed with fine setae or setulse. 



Sex: as a number, six: the physical difference between male and female: 



usually indicated by the sign of Mars (J 1 ) for male, and Venus ($) for 



female ; workers or undeveloped females have the sign of Venus without 



the cross line (9"), 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 Heteroptcra : 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 $ 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 larvae in Neuroptera. 

 Silk-glands: a pair of modified salivary glands in certain larvae, 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. 



