Indeterminate: not defined nor well marked; obscure: of no constant form or shape.
Indirect: applied to metamorphosis = complete.
Indumentum: a covering of hairs, scales or tufts.
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.
Infra: below or beneath: opposed to supra.
Infra-anal 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-anal plate.
Infra-clypeus: = ante-clypeus and rhinarium: q.v..
Infracted: abruptly bent inward, as if broken.
Infra-genital: below the genital opening or process.
Infra-marginal: situated below or behind the marginal cell.
Infra-median vein; in Orthoptera: = ulnar vein: q.v.
Infra-ocular: applied to the region below and between the eyes.
Infra-oesophageal: situated below oesophagus; see sub-oesophageal.
Infra-stigmatal: situated below the stigmata or spiracles.
Infuseated: smoky gray-brown with a blackish tinge [Roman sepia].
Ingens: unusually large or disproportionate in size.
Inner margin: the line extending along the lower or interior edge of the wing from the base to the hind or anal angle.
Inocular: inserted in the inner margin of and partially or wholly surrounded by the eye.
Inquiline: a species living in a gall or other structure prepared by a different species, not as a parasite but as, a guest.
Inquiline: living as guests in the homes of others; as in galls.
Insect: a member of the class Insecta strictly limited.
Insecta: broadly defined, contains all articulates that are also tracheates and have the head free from the thorax; more strictly limited to those forms that have only three pairs of thoracic legs in the adult stage and a limited number of segments.