Stigma, stigmatic spines. Terms sometimes employed for spiracles, &c.
Tarsus. The fourth joint of the feet, between the tibia and the claw. Its consisting of one joint (monomerous) is a distinctive character of the whole family. ([Plate I], Fig. 6, ta.; Fig. 7, ta.)
Test. The waxy, glassy, or horny covering produced through the spinnerets and concealing the insect in many Lecanidinæ and some Coccidinæ. In this work it is not applied to the "scale" of Diaspidinæ or to cottony secretions.
Thoracic band. An appearance seen on the thoracic region in the male, looking like a broad transverse ribbon.
Thoracic region, thorax. That part of the female or the male which bears the three pairs of feet, when the feet are present; or, if the feet are absent, the middle portion of the body, segmented or not.
Tibia. The third joint of the feet, next the femur. ([Plate I], Fig. 6, ti.; Fig. 7, ti.)
Tracheæ. Tubes ramifying throughout the body, conveying air to the blood. Their orifices are the spiracles. The tracheæ, as in other insects, appear as if constructed of a network of fine spiral wires. ([Plate II], Fig. 4 d; Plate xx., n.)
Trochanter. A small articulation, not a distinct joint (something like a knee-cap) of the feet, between the coxa and the femur. ([Plate I], Fig. 6, tr.; Fig. 7, tr.)
Trimerous. Three-jointed.
Ventral. On the under-side, the insect being in its proper position.