al stage just before pupation.

Ultramarine: an intense deep blue [cobalt blue].

Ultra-nodal sector: in Odonata, runs parallel with and between media
1 and 2, or principal and nodal sectors: = postnodal sector.

Umbilicate: navel-shaped, or resembling a navel.

Umbilicus: a navel, or navel-like depression.

Umbonate: bossed; with an elevated knob in the centre.

Umbone: an embossed, elevated knob situated on humeral angle of
elytra.

Umbones: two movable spines on the sides of prothorax in some
Coleoptera.

Umbrosa: shaded or clouded: a cloud or shade.

Unarmed: without spurs, spines or armature of any kind.

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. Neb