Ignitus: fire-red [vermilion].

Ileo-colon: the anterior portion of the hind-gut, extending from the mid-gut to the r.e.c.t.u.m, when not distinctly differentiated into ileum and colon.

Ileum: the small intestine; begins at end of chylific ventricle at the point where malpighian tubules join, and extends to colon.

Imaginal: pertaining to the adult or imago.

Imaginal buds, cells, or discs: in forms with a complete metamorphosis are those embryonic cells around and from which the organs and appendages of the future imago develop.

Imago: the adult or s.e.xually developed insect.

Imbricate: arranged or appearing like the scales on a fish or the shingles on a roof.

Immaculate: dest.i.tute of spots or marks.

Immarginate: without an elevated rim or margin.

Immersed -us: inserted, imbedded or hidden in.

Imponderable: that which cannot be weighed.

Impregnate-ed: to make or made fertile or pregnant: fertilized.

Impressed -us: a surface with shallow depressed areas or markings.

Impubis: without hair.

Inaequalis: unequal.

Inarticulate: not jointed or segmented.

Inaurate -us: golden yellow [pale cadmium yellow].

Inea.n.u.s: h.o.a.ry.

Inch: the English and American standard of length in insect measurement: it is = 12 lines and = 25.4 mm.: usually expressed in units and hundredths, as 1.01.

Incised: notched or deeply cut into.

Incision: any cut into a margin or through a surface: the marginal slits or notches in Coccidae.

Incisure: an impressed line marking the junction of two segments: an incision.

Inclinate -us: leaning or inclining.

Inclusus: when one part is wholly or partially hidden in another.

Inconspicuous: not attracting attention or quickly noticeable.

Incra.s.sated: thickened: rather suddenly swollen at some one point, especially near tip.

Incubate: to brood: to cause to develop; as an egg.

Inc.u.mbent: lying one over another: wings when they cover the dorsal horizontally.

Incunabulum: = folliculus and coc.o.o.n; q.v.

Incurved -ate: bowed or curved inwards.

Independent: in Lepidoptera; that vein of the wings that arises from the cross-vein closing the cell, and does not branch directly from any vein reaching the base: it is v. 5 of the numerical series in both wings and the media of Comstock.

Indeterminate: not defined nor well marked; obscure: of no constant form or shape.

Indigote: a very deep indigo blue.

Indirect: applied to metamorphosis = complete.

Indumentum: a covering of hairs, scales or tufts.

Indurated: hardened.

Indusium: the case made by an insect larva: a membranous layer of the embryo of Locustidae below the serosa.

Inequal: a surface with irregular elevations and depressions.

Inermis: unarmed: without spines or spurs.

Infericornia: Hemiptera; in which the antenna appear to be inserted well down on the sides of head; e.g. Lygaeidae.

Inferior: beneath, below or behind: a term of position.

Inferior appendage -es: in male Odonata the lower one or two of the terminal abdominal parts used to clasp the female in copulation.

Inferior wings: = hind wings or secondaries: q.v.

Infero-posterior: below and behind: refers to location.

Inflated: blown up; distended bladder-like.

Inflected: bent inward at an angle.

Inflexus: = inflected.

Infra: below or beneath: opposed to supra.

Infra-a.n.a.l lobe: a thick, conical fleshy lobe, often ending in a chitinous point, situated beneath the vent in caterpillars.

Infra-cereal plates: in Orthoptera - generally inconspicuous paired plates which underlie in part the cerci and in part the lateral portion of the supra-a.n.a.l plate.