y
ventrad.

Hypographous: shaded; applied to a fascia that becomes gradually
darker.

Hypomeron -a: in Coleopteran; the inflexed edge of the pronotum
(pronotal hypomera); and the raised lower margin of the epipleural
(elytral hypomera) (see epipleural) fold.

Hypopharyngeal: relating to the hypopharynx.

Hypopharyngeal sclerites: in bees, a pair of strap-like pieces along the
hypopharynx to the mentum: see also epipharyngeal sclerites.

Hypopharynx: a sensitive and sensory structure on the upper surface
of labium that serves as an organ of taste, or true tongue.

Hypopleura: in Diptera, the space over the middle and hind coxa,
between the metapleura and pteropleura: the side of the
metasternum: the mesepimeron of the mesothorax.

Hypoptere: = tegula; q.v..

Hypopygium: the anus: more specifically the lower plate of the anal
opening: in Diptera, the male sexual organs and terminal segments of
abdomen = propygium.

Hypostoma: in Diptera; that portion of the head included between
antennae, eyes and mouth: in Hemiptera: the lower part of face.

Hypotenuses: in Odonata; the simple or broken cross-vein between
media 4, and cubitus 1, forming outer boundary of triangle.

Hypotypes: includes specimens upon which supplementary
descriptions are based: = apotypes.

I

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.

Ignitus: fire-red [vermilion].

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.

Immaculate: destitute of spots or marks.

Immarginate: without an elevated rim or margin.

Immersed -us: inserted, imbedded or hidden in.

Imponderable: that which cannot be