U

Ulnar nervure. - A radiating or cross nervure in the wing. (L. ulna, and nervus.)

Umber. - Brown, dark with yellow. (Umbria, in Italy, where the ore of iron of this name is mined.)

Umbones. - Two movable thorns situated on the prothorax in Acrocinus longimanus. (L. umbo, anything that projects.)

Umbra. - A shadow; a slight shade of colour upon a paler ground, when not easily distinguished. (L. a shadow.)

Un-. - A Saxon prefix signifying not before nouns or adjectives, and the reversal of its action before verbs.

Unciform. - Hook-shaped having the form of a hook. (L. uncus, a hook, and forma.)

Uncinate. - Hooked at the end. (L. uncus.)

Uncinate. - (Antennæ) Hooked, having the last joint bending back upon the preceding. (L. uncus.)

Under Wings (Alae inferiores). - The lower, or secondary pair of organs of flight. (A.S. under, and Scand. wing.)

Undose. - Having undulating nearly parallel somewhat broad depressions which run into each other, and resemble the sand of the sea-shore when left by the tide. (L. undosus, billowy wave-like.)

Undulate. - Possessing waved markings, either longitudinally or transversely. (L. undulatus, from unda, a wave.)

Undulatus. - Waved; a margin with a series of successive arched incisions. (L. undo, undulate.)

Unequal. - Different in size or length. (un, and L. æqualis, equal.)

Ungues, Ungula, Unguicula. - Claws, or curved hooks at the extremity of the tarsi. (L. unguis, a claw.)

Ungues. - (Mouth.) The claws; one or more corneous sharp claws which arm the lobes of the maxilla. (L.)

Unguicula (pl. unguiculæ). - A sharpened curved claw at the extremity of the ungula; generally two in number. (L. diminutive of unguis, a claw.)

Unguiculate. - (Maxillæ) When the terminal tooth of the maxilla is movable, and can be moved to, and withdrawn from, the internal margin of the superior lobe at the will of the insect. (L. unguis.)

Unquiculate. - Clawed; having claws. (L. unguis.)

Unguiform. - Shaped like a claw. (L. unguis and forma.)

Ungula. - The fifth or terminal joint of the tarsus. (L. a claw.)

Ungulate. - Possessing claws. (L. ungula, a claw.)

Ungulate. - Hoof-shaped like a horse's hoof. (Say).

Uni-. - In composition, indicates one. (Uni, from L. unus, one.)

Unicapsular. - Possessing only one capsule. (L. unus, and capsula, a capsule.)

Unicolorus. - Of one colour, of the same hues. (L. unus, and color, colour.)

Unicornous. - Possessing only one horn. (L. unus, and cornu, a horn.)

Uniform. - Having the same form; not variable; consistent with itself. (L. unus, and forma.)

Unilabiate. - Possessing a single lip. (L. unus, and labium, a lip.)

Unilateral. - On one side only (of the exterior of joints of lamellate antennæ, etc.) (L. uni, and lateris, a side.)

Unilocular. - Having one cell only. (L. unus, and locus, a place.)

Unisetose. - Bearing one seta. (L. unus, and seta, a bristle.)

Unpaired median nervous system. - [See Vagus Nervous System.]

Urate cells. - Large opaque cells, easily seen in the larval and pupal stages, but in the adult small, and may be regarded as a primitive form of kidney, adapted for storing the products of tissue metabolism. (From L. urina, urine.)

Urceolate. - Pitcher-shaped; swelling in the middle like a pitcher. (Mod. L. urceolatus, from L. urceolus, diminutive of urceus, a water-pitcher.)

Urinary tubes. - The outgrowths of the proctodæum. (From L. urina, urine.)

Urites. - The segments of the abdomen (Lacaze Duthiers), (Gr. uro- prefix from tailed; oura, a tail.)

Urites. - A condensed term of the urosternites. (Packard.)

Uro-. - Tailed; having a tail or a tail-like process or processes. (Gr. prefix from oura, a tail.)

Uromeres. - The abdominal segments. (Packard.) (Gr. uro, and meros, a part.)

Uro-patagia. - The podical plates. (Packard.) (Gr. uro, and patagia.)

Urosome. - The abdomen. (Packard.) (Gr. uro, and soma, a body.)

Urosternites. - The sternal sclerites. (Packard.)

Ustulate. - So marked with brown as to have the appearance of being scorched. (L. ustulatus, of ustulo, to burn.)

Uterus. - The vagina; the term is generally used with the pupiparous forms. (L. the lower part of the belly; inner part; the womb.)

Utriculi majores and breviores. - The numerous large and short utricles which the seminal vesicles bear. (L. utriculus.)

Utrinque. - With respect to the direction of parts, the term is used to indicate a quality or peculiarity found on each side of the body and at the same place. (L. utrinque, on both sides.)

Utricle. - A little bag or bladder; a cell; a thin capsule of one cell, containing a single sperm. (L. utriculus, a small skin, from uter, a bag or bottle of hide.)

Utricles. - Numerous tubes found in the sperm vesicles. (L. utriculus.)

Utricular. - Containing utricles; furnished with granular vessel-like little bags; like an utricle. (L. utriculus.)