Transverse: when the longest diameter is across the body. Transverse incision: = transverse sulci. Transverse sulci: the transverse grooves of pronotum in many Orthoptera. Transverse suture: in Diptera, a transverse groove extending inward from the root of wing and obsolete in the middle of dorsum. Trapeziform: in the form or shape of a trapezium. Trapezium: a four-sided figure in which no two sides are parallel. {Scanner's comment: sic This is presumably an error in editing the original text. A trapezium has two sides parallel. Compare next item.} Trapezoid -al: a four-sided plane of which two sides are parallel and two are not. Tri-: three; a combining form. Triangle: in Odonata: a small, triangular cell at the junction of cubitus with cubitus 1: a similar cell adjoining it basally is the internal triangle discoidal triangle: cardinal cell; q.v. Tri-articulate: composed of three joints or articles. Tribe: a term of classification less than a sub-family: opinionative and ending in ini: but this is not universally adhered to. Tri-carinate: with three keels or carinae. Trichogen: a hair-forming hypodermal cell in caterpillars, etc. Trichoptera: hairy-winged: insects with hairy primaries with many longitudinal veins and cells, covering the broader secondaries which are usually folded lengthwise; mouth mandibulate but rudimentary: head free; thorax agglutinate: metamorphosis complete. Trichostical bristles: in Diptera, a fan-like row, situated on the meta-pleura: conspicuous in some families. Trichotomous: divided by threes. Trichroism: the condition when any given part exhibits three different colors in different individuals of the same species: e.g. in Lepidoptera, the hind wings of certain Heliconids. Tricuspidate: ending in three points: with three cusps or teeth. Tridactyle -ous: having three toes or claws. Trifid: cleft into three parts or ends. Trigonal: triangular: an area bounded by a triangle. Trigonate: three-cornered; approximately triangular. Trigoneutism: where three broods occur in one season. Trigonulum: in Odonata, = triangle. Trimera: that series of Coleoptera, in which there are only three tarsal joints present. Trimerous: species which have the tarsi three-jointed. Trinomial: that method of nomenclature in which a varietal or subspecific name follows the specific term without an intervening mark or indications of its rank. Tripectinate: when an antenna has three branches or processes to each joint. Triquetral: = triquetrous. Triquetrous: with three flat sides. Tri-regional: divided into three distinct parts or regions. Trito-cerebral segment: see second antennal segment. Trito-cerebrum: the posterior portion of the brain, formed by the ganglion of the third primary segment; also termed labro-frontal lobe. Tri-undulate: with three waves or undulations. Triungulin: the first larval stage of a meloid beetle.