Syncerebrum: the compound brain of insects.

Synchronous: happening at the same time.

Synciput: that portion of the vertex lying between the eyes.

Syncitium: ma.s.ses 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 cla.s.sification.

Testate: covered; concealed: also used as = tectiform.

Tectiform: roof-like, sloping from a median ridge, like the primaries of Cicada.

Tegmen: a covering: sometimes used for the anterior wings in Orthoptera and Neuroptera.

Tegmina: the thickened primaries serving as wing covers in Orthoptera.

Tegulae: small, more or less cup-like scales at the base of primaries in many insects; specifically in Hymenoptera: in Lepidoptera, = the patagia or shoulder tippets; but the h.o.m.ology is disputed; also applied to the lappet-like pieces forming the collar: in Diptera, the alulae, q.v.: the latter use is unfortunate and should be abandoned; the first definition should limit the use of the term: see aileron.

Tegument: a covering surface or skin.

Teleodont: applied to those forms of male Lucanids bearing the largest mandibles: see mesodont, amphiodont, priodont.

Telescopic: arranged so that one portion of an organ or process may be drawn into another, like the joints of a telescope.

Telson: a terminal tubercle bearing the a.n.a.l opening: the a.n.a.l segment of the insect embryo.

Telum: a spear, or spear-shaped process.

Temple: the posterior part of the gena; behind, before or beneath the eye.

Tempora: the temples.

Temporal margins: in Mallophaga, the lateral margins of the hind head.

Tenaculum: in Collembola, a small organ which holds the furcula in position when at rest: = catch.

Tenant hair: see tenent hair.

Tendo: the a.n.a.l area of secondaries when it forms a groove for the abdomen: has also been called frenum and frenulum: in Trichoptera, a small elliptical s.p.a.ce at base of hind wings near base of a.n.a.l veins and behind the trochlea.

Tendon: the slender, chitinous plates, bands, strap- or cup-shaped pieces, to which muscles are attached for moving appendages: see apodeme.

Tenent hair: specialized hair adapted for clinging or clasping.