Explanation of Terms Used in Entomology Part 86

Transverse: when the longest diameter is across the body.

Transverse incision: = transverse sulci.

Transverse sulci: the transverse grooves of p.r.o.notum 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 cla.s.sification 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.

Trivial: applied to a name, means specific as opposed to generic, or popular as opposed to technical.

Trivittate: with three stripes or vitta.

Trochalopoda: Heteroptera in which the posterior c.o.xae are nearly globose and the articulation is a ball and socket joint: see pagiopoda.

Trochanter: a sclerite, sometimes divided, between the c.o.xa and femur sometimes fused with the femur.

Trochanterellus: see apophysis.

Trochantine: the basal part of the trochanter when it is two-jointed: in Coleoptera, a piece often present on the outer side of and sometimes movable on the c.o.xa; also the small sclerite connecting the c.o.xa with the sternum in Dytiscidae: in Neuroptera and Trichoptera the posterior separated part of the c.o.xa: in Orthoptera, a narrow longitudinal sclerite between mandible and gena.

Trochiformis: cylindro-conic.

Trochlea: the thickened base of the hind wings in Cicada: in Trichoptera a small elliptical s.p.a.ce at base of hind wing behind origin of median vein.

Trochlearis: pulley-shaped; like a cylinder contracted medially.

Trochus: that part of an articulated body inserted between the joints.

Trophi: the mouth parts collectively, including the labrum: see buccal appendages.

Trophobiosis: see Symbiosis.

Tropical: is that faunal region which covers the southern part of the peninsula of Florida, the greater part of Central America, the lowlands of southern Mexico south of the table land, and a narrow strip on each side of Mexico which follows the coast northward into the United States.

Tropico-politan: occurring in all tropical regions.