Nephridia: tubular structures functioning as kidneys in Annelids, Mollusks, etc. and incorrectly used as = malpighian tubules; q.v. Nepionic: that stage of development immediately succeeding the embryonic; proposed as a substitute for larval. Nerinaeum: a ventral thoracic sclerite between the metasternum and posterior coxa in some Coleoptera. Nerve: a thread-like structure, composed of delicate filaments whose function it is to transmit sensations or stimuli to or from a ganglion or from or to any part of the body or its appendages. Nerves: sometimes used to = veins, in wing structures. Nervi: belonging or referring to the nerves. Nervulation: arrangement of the nerves: specifically applied to the arrangement of the chitinous framework of wings and thus= venation; q.v. Nervules or Nervures: the rod or vein-like structures supporting the membranes of wings and = veins and veinlets; q.v. Nervuration: = nervulation and venation: q.v. Neural canal: an incomplete tunnel on the floor of meso- and metathorax, formed by fusion of apodemes, serving for the reception and protection of the ventral nerve cord and for the attachment of muscles. Neural groove: is that furrow in the primitive layer of the embryo in which the nerve cord is formed. Neuration: = venation; q.v. Neurilemma: the external sheath of a nerve fibre. Neuroblast: the large cell in the early embryo, from which the nervous system develops. Neuromere: that part of a body segment pertaining to the nervous system. Neuroptera: nerve-winged: an ordinal term applied to insects with four net-veined wings; mouth mandibulate: head free: thorax loosely agglutinated; metamorphosis complete: in its older use, the term applied to all net-veined insects irrespective of metamorphosis or thoracic structure. Neuropteroidea: like the Neuroptera in the wide sense; applied to those living insects included by Linnaeus in his Neuroptera; also to those extinct forms which have a general resemblance to them. Neurospongium: a granular matrix in the periopticon of the insect eye. Neuter: the term applied to workers or undeveloped females in some Hymenoptera: indicated by * or *, an imperfect form of Venus sign.{Scanner's comment: I have no characters to represent the symbols. One is like the normal female (Venus) sign, but with no cross stroke on the downward stroke. The other is the symbol for Mercury or of Hermaphroditus, like a Venus sign crowned with crescent horns.} Nidificate: to nest: applied when eggs are placed in a prepared receptaculum. Niger: black. Nigricans: black, tinged with gray. Nits: the eggs of sucking lice; specifically when attached to a hair: in general, though rarely, applied in the singular to an egg. Nitidus: shining: applied to a highly polished, smooth surface. Niveous -eus: snowy white. Nocturnal: species that fly or are active at night.