like openings of the heart.

Ostiolar canal: a marginal furrow leading from the ostiole.

Ostiole: in Heteroptera, the openings at the sides of meso- and
metathorax, through which an odoriferous fluid is excreted.

Ostium: singular of Ostia; q.v.

-osus; an affix, signifying saturation, or the possession of the quality
expressed in the stem word.

Otocyst: an auditory or ear-like vesicle.

Otolith: a little ear-bone: granules or concretions found in an otocyst.

Outer lobe: of maxilla = galea; q.v.

Outer margin: the outer edge of wing, between apex and hind angle.

Ovo, Ovum: the eggs; an egg.

Ova glebata: eggs laid or concealed in lumps of dung.

Ova imposita: eggs laid in the substance that is to serve as food for
the larva.

Oval: egg-shaped, with both ends similar.

Ova pilosa: eggs that are covered with hair: usually from the abdomen
of the female.

Ovarian tube: a tubular structure in which are developed the cells
forming the future ova: a single one of the mass which, taken
together, form the ovaries.

Ovaries: a mass of ovarian tubes, lying one on each side of the body
cavity of the female, in each of which tubes eggs or ova are developed:
the individual tubes of an ovary all converge to one oviduct.

Ovariole: an ovarian tube: q.v.

Ovary: singular of ovaries; q.v.

Ovate: in outline, egg-shaped or oval.

Oviduct: the tube through which the egg passes from ovarian tubes
into vagina: sometimes used in the sense of ovipositor: q.v.

Oviform: egg-shaped.

Oviparous: where reproduction is through eggs laid by the female.

Oviposition: the act of depositing the eggs.

Ovipositor: the tubular or valved structure by means of which the eggs
are placed; usually concealed; but sometimes extended far beyond the
end of the body.

Oviscapt: = ovipositor; q.v.

Ovivalvule: in Ephemeroptera; is an appendage of the female
reproductive organs.

Ovoviviparous: when living young are born from eggs which are
hatched in the body of the parent.

P

Pacific coast humid area: is that faunal area of the transition zone
comprising the western parts of Washington and Oregon between the
Coast Mountains and Cascade range: parts of northern California and
most of the coast region from near Cape Mendocino south to the
Santa Barbara Mountains. To the south and east it passes into the
arid transition and in places into the upper Sonoran.

Pad: the pulvillus, or that part of it which is capable of