Hypotypes: includes specimens upon which supplementary descriptions are based: = apotypes.
Iceous or Icius: suffix; expresses a likeness or the possession of a character see aceus.
Icotypes: typical specimens which serve for purposes of identification, but have not been used in literature.
Idiotype: a specimen named by the author after comparison with the type, but not also a topotype.
Ileo-colon: the anterior portion of the hind-gut, extending from the mid-gut to the rectum, 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 sexually developed insect.
Imbricate: arranged or appearing like the scales on a fish or the shingles on a roof.
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.
Inaurate -us: golden yellow [pale cadmium yellow].
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.
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.
Inclusus: when one part is wholly or partially hidden in another.
Inconspicuous: not attracting attention or quickly noticeable.
Incrassated: thickened: rather suddenly swollen at some one point, especially near tip.
Incubate: to brood: to cause to develop; as an egg.
Incumbent: lying one over another: wings when they cover the dorsal horizontally.
Incunabulum: = folliculus and cocoon; q.v.
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.