Totidem: in all parts; entirely.

T.P. line: transverse posterior line; crossing the primaries of certain
Lepidoptera, two-thirds or more from base: = post medial line.

Trabecula: rounded, lobular masses of the procerebrum, from which
arise the stalks bearing the mushroom bodies: a paired movable
appendage in front of the antennae in certain bird-lice.

Trachea -ae: the spirally ringed breathing tube or tubes of insects.

Tracheal gills: the flattened or hair-like processes in aquatic larvae
through which oxygen is absorbed from the water.

Tracheary: relating to or composed of tracheae.

Tracheate: supplied with trachea: a general term applied to all
articulates that breathe by means of spiracular openings into a
system of tubular structures that extend to all parts of the body.

Tracheation: the arrangement or system of distribution of trachea.

Tracheoles: the capillary trachea of the adult as they develop in
masses in the larva: very small, slender tracheae.

Transection: a cut across, at right angles to the body: transverse
section.

Transition zone: is the transcontinental belt in which the austral and
boreal elements overlap: it is divided into a humid or Alleghanian
area; a western arid area; and a Pacific Coast humid area: all of
which see.

Transitory: lasting for a short time only.

Translucent: semi-transparent; admitting the passage of light but not
of vision.

Translucid: clear: transparent enough to be seen through.

Transparent: so clear as not to obstruct vision.

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.