t.).

Discoidal field: see discoidal area.

Discoidal nervule: Lepidoptera; = media 1 (Comst.).

Discoidal triangle: Odonata - see triangle.

Discoidal vein: Diptera (Schiner), = media 2 (Comst.) anterior
intercalary vein (Loew); Hymenopteran (Norton), = media 2 (Comst.),
beyond the junction with the medial cross-vein: Trichoptera; the first
and largest branch of the humeral vein.

Discoideous: =discoidal.

Discolored -orous: a different color from the surrounding, more or less
contrasting; not concolorous.

Discota: insects in which development of the adults is from imaginal
discs: see adiscota.

Discrete: distinctly separated.

Discs: the abdominal motor processes of coleopterous larve.

Discus: a disc; a somewhat flat circular part or area.

Disjoined or Disjointed: see disjunctus.

Disjunct: with head, thorax and abdomen separated by constrictions.

Disjunctus: separated; standing apart.

Disk: the central upper surface of any part; all the area within a
margin; the central area of a wing: in Trichoptera, the obliquely ridged
outer surface of hind femur in saltatoria.

Dislocated: a stria, band or line interrupted in continuity, when the
tips of the interrupted parts are not in a right line with each other.

Disperses: with scattered markings, punctures or other small
sculptures.

Disposed: arranged or laid out.

Dissepiment: a partition wall: applied to the forming septa separating
the coelom-sacs in the embryo; also the thin envelope about the
members in obtect pupae.

Dissilient: bursting open elastically.

Distad: toward the distal end.

Distal: that part of a joint farthest from the body.

Distant: remote from: standing considerably apart.

Distichous: applied to antennae when lateral processes originate at
the apices of the joints and bend forward at acute angles to them.

Distiproboscis: the outer third of the proboscis in Muscid flies, bearing
the labella.

Distychus: bipartite: separated into two parts.

Ditrocha: Hymenoptera; that series having the trochanter two-jointed.

Diurnae: day fliers: applied to butterflies.

Diurnal: such insects as are active or habitually fly by day only.

Divaricable: able to spread apart or divaricate.

Divaricate: straddling or spreading apart: when the wings are lapped
at base and diverge behind: tarsal claws when arising at opposite
sides of the joint and separating widely.

Divergent: spreading out from a common base; in Coleoptera,