n and western or lower Sonoran area.

Lower field: in termini; see costal field.

Lower fronto-orbital bristles: in Diptera: are on the lower part of front,
above the antennae, along the orbit.

Lower margin: of tegmina (Thomas), is the costal or anterior margin of
other authors.

Lower radial vein: in Lepidoptera (Holland) media 2 (Comst.).

Lower sector of triangle: in Odonata - = cubitus 2 (Comst.).

Lower Sonoran faunal area: comprises the most arid deserts of North
America, beginning west of lat. 98 degrees in Texas: sends narrow arms into
southern New Mexico, is interrupted by the Continental Divide; covers
a large part of w. and s. Ariz., s. w. Nev., s. w. Calif., a portion of
central Calif., and most of Lower Calif. These areas are irregular and
incapable of brief definition.

Lubricate -ous: covered with a slippery mucus.

Lucid: shining; applied to luminous insects.

Luciferase: a substance in the nature of an enzyme, existing in the
luminous organs of light-giving beetles.

Luciferine: a substance in the blood of luminous beetles which, when
brought into contact with luciferase, produces light.

Luciferous: light giving.

Lucifugous: fleeing the light: applied to nocturnal forms or those that
live in concealment.

Lumen: the cavity of an organ: the inner surface of a tube: the hollow
portion of a gland or vesicular structure.

Luminescence: applied to the light of fire-flies, as a substitute for
phosphorescence.

Lumper: one who, in describing species or genera recognizes only
prominent or obvious characters to the exclusion of minor color or
variable characters of maculation or structure: see splitter.

Lunaris or Lunate: crescent-shaped: formed like a new moon.

Lunula: a small lunule or crescent.

Lunulae: in Hymenoptera, crescent-shaped marks near the orbits.

Lunulate: a line, when made up of a series of small lunules.

Lunule: a lunate mark or crescent.

Lurid -us: dirty brown with a bluish tinge [pale brown + a little French
blue]: also used to indicate an obscuring of bright colors.

Luteo -testaceous: dark clay yellow.

Luteous -eus: clay yellow [pale clay yellow].

Lutescent: becoming or appearing to be clay yellow.

Lutose -us: apparently or really covered with dirt.

Lymphatic: producing, carrying or relating to the lymph.

Lyrate: lyre-shaped: cut into several transverse segments, and
gradually enlarging towards the extremity.

Lyre: the upper wall or border of