Cusp -is: a pointed process; sometimes at the margin of a wing.
Cuspidate: prickly pointed; ending in a sharp point; with an acuminated point ending in a bristle.
Custodite -us: guarded: a body in an envelope.
Cuticula: = cuticle: specifically applied to the outer or chitinized layer: see epidermis and hypodermis.
Cyaneous: pure dark blue: indigo blue [French blue].
Cyanescent: with a deep bluish tinge or shading.
Cyanogenic: applied to repugnatorial glands in myriapods and sometimes in insects.
Cyathiform: obconical and concave; cup-shaped: = cupuliform.
Cyatotheca: the cover of the thorax in the pupa.
Cycle: a round or circle, e.g. of development; a life cycle.
Cyclorrhapha: that section of Diptera in which the adult escapes from the hardened pupal case by pushing off a lid or covering: see orthorrhapha. Cyclorrhaphous: circular seamed.
Cydariform: globose, but truncated at two opposite sides.
Cylindrical: in the form of a cylinder or tube; round, elongate, of equal diameter throughout.
Cymbiform: boat-shaped: a concave disc with elevated margin; navicular.
Cytoplasm: the protoplasm of a cell exclusive of nucleus; the cell body.
Dactylus: a finger or toe: = digitus: a tarsal joint after the first one, when that is enlarged as in bees.
Dagger mark: a marking in the form of a Greek Psi _.
Dash: a short disconnected streak or mark.
Dasygastres: bees with pollen-carrying structures on the abdomen.
Deciduous: that which may be cast off or shed.
Declinate -us: a part somewhat bent, the apex downward.
Decumbent -ous: sloping gradually downward.
Decumbent: bending down at tip from an upright base.
Decurrent: closely attached to and running down another body.
Decussate: crossing at an angle: X-like: in cross pairs; or, when bristles alternately cross each other, as in some Diptera.
Deflected: bent downward: the wings, when the inner margins lap and the outer edges decline toward the sides.
Deformed: twisted or set in an unusual form: specifically, in Coleoptera applied to knotted or twisted antennae as in male Meloids.
Dehiscence: the splitting of the pupal integument in the emergence of the adult in Lepidoptera.
Dehiscent: open or standing open: separating toward the tip.
Dejectamenta: the excrement or excretion.