Trichoptera,
specifically, a hyaline spot on second fork of median vein.

Thyrsus: a cluster.

Thysanoptera: fringe-winged: an ordinal term, applied to species with
four narrow, similar wings, lengthily fringed; mouth parts fitted for
puncturing and scraping; metamorphosis incomplete: the Thripids.

Thysanura: fringe-tails; wingless, mandibulate insects without
metamorphosis; with anal appendages; body covered with scales;
thoracic segments similar.

Tiarate -us: turban or tiara-like.

Tibia -ae: the shank: that part of the leg articulated to the femur
basally and which bears the tarsus at the distal end.

Tibial epiphysis: a movable process attached near the base of the
inner side of the anterior tibia in many Lepidoptera.

Tibial membrane: in male Cicada, the drum-like vibratory membrane
that produces the sound.

Tip: the extremity; the part furthest removed from the base.

Titillator: a small process just below the penis in some Orthoptera.

Tomentose: covered with fine hair, so matted together that particular
hairs cannot be separated.

Tomentum: a form of pubescence composed of matted, woolly hair: in
Diptera applied to a covering of short, flattened, more or less
recumbent, scale-like hair which merges gradually into dust or pollen.

Tongue: an indefinite term, applied usually to the coiled mouth
structure of Lepidoptera; the lapping organ of flies; the ligula of bees
and wasps and, sometimes also to the hypopharynx of other insects.

Tooth: an acute angulation: a short pointed process from an
appendage or margin.

Topomorph -ic: a geographic form, variety or subspecies of a widely
distributed species: developed by local environment.

Topotype: is a specimen collected in the exact locality whence the
original type was obtained.

Tornal: relating to or concerning the tornus.

Tornus: in Lepidoptera, the junction of the termen and dorsum of
wing: = hind or anal angle; q.v.

Torose: swelling into knots or protuberances.

Torpid: lying motionless by reason of cold or other natural conditions
that unfavorably affect the organism.

Torqueate: with a ring or collar.

Torquillus: = rotula.

Tortilis: twisted.

Tortulose-us: hump-backed; a surface with a few large elevations:
beaded; moniliform.

Tortuose -us: irregularly curved and bent; snake-like.

Tortuous: = Tortuose.

Torulus: the basal socket joint of the antenna upon which the organ is
articulated for movement in all directions.