ted wings.

Thamnophilous: applied to species living in thickets or dense
shrubbery.

Theca: a case or covering: specifically applied to the fleshy covering of
the fly-mouth; to the cases of the Trichopterous larvae; to the lower
piece of the male genitalia in Homoptera; and to the outer covering of
the pupa.

Thelyotoky: parthenogenetic reproduction when the progeny are all
females see Arrhenotoly and Deuterotoky.

Thigh: see femur.

Thigmotactic: contact-loving: applied to species that tend to live close
together or in touch, one with the other.

Third longitudinal vein: in Diptera (Will.):= radius 5 (Comst.).

Third posterior cell: in Diptera, = 2d medial 2 (Comst.).

Third submarginal cross-nervure: in Hymenoptera (North.):= radius 4
(Comst.).

Thoracic: belonging or attached to the thorax.

Thoracic dorsal bristles: in Diptera, the specialized bristles on the
dorsum of the thorax.

Thoracic feet: the jointed legs on the thoracic segments of larvae, as
distinguished from abdominal or pro-legs.

Thoracico-abdominal: the first segment of the abdomen when united
with the thorax so as to form part of it: =propodeum.

Thoracic pleural bristles: in Diptera, the specialized bristles situated
on the pleural region of the thorax.

Thoracotheca: = cytotheca: q.v.

Thorax: the second or intermediate region of the insect body, bearing
the true legs and wings: made up of three rings, named in order, pro-,
meso-, and meta-thorax: when the pro-thorax is free as in Coleoptera,
Orthoptera, and Hemiptera, the term thorax is commonly used in
descriptive work for that segment only: in Odonata, where the
prothorax is small and not fused with the larger and united meso- and
meta-thorax, the term thorax is commonly used for these latter two
united, excluding the prothorax.

Thread-plate: an epithelial plate of the embryo from which the
terminal threads of the ovarian tubes originate.

Thyridial cell: in Trichoptera: the cell formed by the first fork of
median vein; the cell behind Thyridium.

Thyridiate: applied to a wing vein that at one point seems broken so
as to permit of a folding or bending; either to pack into a small
compass or to enfold the body.

Thyridium -ii: small, whitish or almost transparent spots near the
anastomosis of the disc of the wings in some Neuroptera, or in the
recurrent veins in the cubital cellule in some Hymenoptera; also the
apical margin of the gastrocoeli, often alone visible: in