Intricate: irregular: confused; applied to markings and sculpture. Intromittent: used for throwing within. Intromittent organ: the penis; q.v. Introse -um: directed inward, toward the body. Intrusus: seemingly impressed with a sharp point. Intumescent: enlarged; swollen: expanded. Invaginate: when a tubular or vesicular part is turned inward or retracted within the body wall. Invagination: a pouch or sac formed by an infolding or indrawing of the outer surface. Investitus: unclothed: a surface without scales or hair. Involucrate: = involute. Involucrum alarum in Dermaptera a flap of the metanotum. Involute: spirally rolled inwardly. Involuti: butterflies whose larvae live in a folded leaf; Hesperidae. Iridescent: a surface which reflects the prismatic hues. Iridicolor: any color so broken up as to reflect the prismatic hues. Iris: the circle which, in an ocellate spot surrounds the pupil. Irised: with rainbow colors. Iris-pigment: = iris tapetum. Iris tapetum: the pigment layer of the compound eye just below the crystalline cone. Irregular: unequal, curved, bent or otherwise twisted or modified without order or symmetry, e.g. certain antennae. Irrorate: marked with minute points; freckled. Isabelline -us: pale yellow with some red and brown [chronic lemon with a little carmine and roman sepia]. Ischia: = pleura; q.v. Iso-: equal. Isolate: to separate out from others; occurring alone. Isomers: that series of Coleoptera in which the tarsi have an equal number of joints on all feet. Isomerous: with equal number of tarsal joints on all feet := homoeomerous. Isomorphous: having the same form, appearance or construction. Isopalpi: that series of Trichoptera in which the palpi of both sexes have the same number of joints. Isoptera: equal winged: an ordinal term for insects with four, similar, net-veined wings; mouth mandibulate; thoracic rings similar, loosely jointed metamorphosis incomplete: the Termitidae. {Scanner's note: In modern nomenclature the Isoptera constitute the order of all termites; the Termitidae are just one family within the Isoptera.} Isotypical: a genus described from more than one species, all of which are congeneric. -itus: = -atus; q.v. -ius: suffix; having the power or ability to. J Jabot: the crop; q.v. Janthine: violet colored. Jaw-capsule: contains the mouth structures in those dipterous larvae in which the head is differentiated. Johnston's organ: a complex nervous structure in the basal joint of dipterous antennae. Joint: a segment or part between two incisures: an articulation. Jubate -us: fringed with long pendent hairs. Juga: the lateral anterior lobes of the head of a Heteropteron; each side of the tylo. Jugatae: that series of Lepidoptera in which there is a jugum instead of a frenulum to unite the wings in flight. Jugular: of or pertaining to the throat. Jugular sclerite: small sclerite in the membrane connecting the head with the thorax: see cervical sclerite.