Discoidal cell: Hymenoptera (Norton) 1st medial 2, medial 3 and medial 4 (Comst.).
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.
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.
Discs: the abdominal motor processes of coleopterous larve.
Discus: a disc; a somewhat flat circular part or area.
Disjunct: with head, thorax and abdomen separated by constrictions.
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.
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.
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, tarsal claws are divergent when they spread out only a little; divaricate when they separate widely.