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.