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.

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 coxae are nearly
globose and the articulation is a ball and socket joint: see pagiopoda.

Trochanter: a sclerite, sometimes divided, between the coxa and femur
sometimes fused with the femur.

Trochanterellus: see apophysis.

Trochantine: the