Unarticulate: not jointed nor segmented. Unci: thick, hooked processes, forming the borders of the anal opening. Uncinnate: hooked at the end. Uncus: in Lepidoptera, Diptera, and elsewhere, the curved book directed downward from a triangular dorsal plate in the male and shielding the penis: the genital hamule. Undate: wavy or waved. Undulated: obtusely waved in segments of circles. Unequal: unlike in size, form, development or other characters. Ungues: the tarsal claws. Unguiculate: armed with a hook, nail or claw. Unguiculus: a small terminal claw or nail-like process. 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.