Symphysis: where two sclerites are joined together by a soft membrane, permitting a slight motion. Synaptera: originally wingless insects without metamorphosis; the Thysanura. Synarthrosis: an articulation without motion. Syncerebrum: the compound brain of insects. Synchronous: happening at the same time. Synciput: that portion of the vertex lying between the eyes. Syncitium: masses of protoplasm with nuclei, found in ovarian tubes; giving rise to ova, nutritive cells or both. Syndesis: that method of articulation where two parts are connected by a membrane which permits of considerable motion between them. Synechtry: the relation borne to ants by insects inhabiting their nests in spite of the efforts of the ants to destroy them: see symphily and metochy. Synista or Synistata: those Neuropterous insects in which the mouth structures are undeveloped, forming an imperfect tubular structure: see elinguata. Synoecy: the relation that exists between ants and those guests that are indifferent to and tolerated by them:= metochy, and see symphily and synecthry. Synonym: a name applied to a species or genus that has been previously named and described. Synonymous: words of different derivation applied to the same conception. Synthlipsis: the basal constriction of the notocephalon in Notonectids. Syntype: = co-type; q.v. Syringe: in Hemiptera, a chamber into which the salivary ducts open and by means of which the secretion is forced forward between the seta or lancets. System: an order of arrangement. Systematic: in definite order, or arranged according to a system. Systole: that regular contraction of the heart that sends the blood outward: see diastole. T T. A. line: transverse anterior line; crosses the primaries of certain moths one-third or less from the base: = antemedial line. Tactile: used for touching; an organ that has the sense of touch. Taenia: a broad longitudinal stripe. Taeniate -us: with broad longitudinal markings. Taenidium -ia: the band or chitinized fibre forming a part of the spiral thread in the trachea of insects. Tail: an elongated terminal segment of the abdomen: the cauda in plant lice: elongated processes on the secondaries, in some Lepidoptera and Neuroptera. Tangential: set in or meeting at a tangent; applied to ornamentation and processes. Tarsal: relating to the tarsi, or feet. Tarsal lobes: membranous appendages arising from the underside of the tarsal joints in some Coleoptera. Tarsus -i: the foot; the jointed appendage attached at the apex of tibia. bearing the claws and pulvilli. Taste cups: specialized pits or cups, with or without a peg or hair, connected with ganglionated nerve cells: occur on the mouth structure and evidence the sense of taste. Tawny: a brownish yellow, like the color of a tanned hide [pale cadmium yellow + Indian red]. Taxonomical: systematic: relating to classification. Testate: covered; concealed: also used as = tectiform.