Part 156

Unguis: one of the claws at the end of the tarsus: also applied to a short process on the 6th antennal joint in some Aphids.

Ungula: a hoof, claw or talon.

Ungulate: shaped like a hoof.

Uni-: one, a combining form.

Unicolorous: of one color throughout.

Unidentate: with one tooth only.

Uniplicate: with a single fold or line of folding.

Unique: one only: unlike any other.

Unisexual: of one sex only: applied to Aphids and Cynipids where only parthenogenic females are known.

Upper austral zone: is divided into an eastern humid or Carolinian area, and a western arid or upper Sonoran area, which pass insensibly into each other near the 100th meridian: see Carolinian and upper Sonoran.

Upper field: in tegmina, = anal field; q.v.

Upper margin: of tegmina (Thomas), corresponds to the posterior or anal margin of most authors.

Upper median area: see areola.

Upper radial: in Lepidoptera, = media 1 (Comst.), and is vein 5, or the independent, of the numerical series.

Upper sector of triangle: in Odonata, = cubitus 1 (Comst.).

Upper Sonoran faunal area: that arid part of upper austral west of 100th meridian; covers most of plains in eastern Montana and Wyoming, s. w. South Dakota, west. Nebraska, Kansas, Oklahoma and Texas, and east. Colorado and New Mexico; covers plains of Columbia, Malheur and Harney in Oregon and Washington. In California encircles Sacramento and San Joaquin Valleys and forms a narrow belt around Colorado and Mohave deserts. In Utah covers Salt Lake and Sevier deserts. In Idaho the Snake plains. In Nevada and Arizona irregular areas of suitable elevation.

Uranidin: a yellow coloring matter in some Coleoptera and Lepidoptera.

Urceolate: pitcher-shaped; swelling in the middle.

Ureter: the stalk connecting the malpighian tubules, when they form large tufts, with the intestine.

Uric acid: the characteristic nitrogenous excretion of the malpighian or urinary tubules: composition, C5H4N4O3 (von Furth).

Urinary vessels: = malpighian tubules; q.v.: has also been applied by older authors, to anal glands.

Urite: an abdominal segment and, specifically, its ventral portion.

Uromere: any of the abdominal segments of an arthropod.

Uropoda: any of the abdominal feet of arthropods.

Uropygium: the ovipositor when it is a mere extension of the abdominal segments.

Urosome: the abdomen.

Urosternite: the sternal or under piece of the uromeres.

Urticating: nettling; applied to specialized hairs or processes on the bodies of certain caterpillars, which cause a stinging or burning sensation on the skin.