D

De-. - A Latin prefix signifying down, or away from. It sometimes negatives and sometimes intensifies the sense.

Deaurate. - A metallic hue, which appears as if the gilding was worn off. (From L. deauro, to gild.)

Decaton. - The tenth segment of insects. (From L. decem, ten.)

Deciduous. - Falling off easily. (L. de, down, and cadere, to fall.)

Declivous. - Gradually sloping. (L. de, and clivus, a slope.)

Decolorate. - When the colour appears to be discharged from any part. (L. decolor, faded.)

Decrepitant. - Crackling (Say). (L. de, and crepitus, noise [crepare, to crackle.]).

Decumbent. - Bending downwards; upright at the base, and bending down at the tip. (From L. decumbo, to lie down.)

Decurved. - Bent downwards. - (L. de, and curvus, bent.)

Decurrent. - Closely attached to and running down another body. (L. de, and curro, to run.)

Decussated. - Arranged in pairs which alternately cross each other. (L. decusso, to cross.)

Deflexed. - Bent down. (L. de, and fecto, flexum, to bend.)

Dehiscent. - Gaping apart towards the apex. (L. dehisco, to gape.)

Deltoid. - Triangular spear-shaped; (Say). (Gr. deltoeides, triangular, delta, a triangle, eidos, like.)

Demi-. - A prefix signifying half. (F.)

Demidiate. - Half round. (L. dimidium, acc. half.)

Dendroid. - Shrub-like, having the appearance of a little tree. (Gr. dendron, a tree, and eidos, like.)

Dentate. - Toothed; furnished with tooth-like prominences. (From L. dentatus, toothed.)

Dentate-serrate. - Tooth-serrated; the denticulations being themselves serrated on their edges.

Dentate-sinuate. - When the denticulations are sinuate.

Dentes. - Teeth; the pointed processes situated on the inner side of the mandibulæ. (L. dens, a tooth.)

Dentes incisivi. - Cutting teeth; superior, compressed, sharp-edged processes situated on the inner side of the mandibulæ. (L. dens, and incido, to cut into.)

Dentes laniarii, canina. - Canine teeth; when the cutting teeth are very sharp and conical. (L. dens, and canis, a dog.)

Dentes molares. - Grinding teeth; are the inferior thicker teeth on the mandibulæ, and which are provided with a broad grinding surface. (L. dens, and molo, grind.)

Denticulate. - (Diminutive of dentate.) Furnished with small teeth. The term is used loosely. (From dens, a tooth.)

Denuded, Denudated. - Destitute of covering. (Wings.) Without hairs or scales. (L. denudo, to make bare.)

Deorsum. - (Direction.) Downwards. (L.)

Dependent. - Hanging down. (L. dependo, to hang down.)

Depressed. - Flattened as if by pressure from above; often used as in opposition to “compressed” - flattened by lateral pressure. (L. deprimo, depressum, to press down.)

Depressors. - Wing muscles, attached to the wing-root, outside the fulcrum. (L. deprimo, depressum.)

Derma, Dermis. - The cuticle or skin. (Gr. derma, the skin, from dero, to flay.)

Dermal. - Pertaining to the derma.

Dermata. - (Pupa.) When the prior skin is retained, and no trace of the situation of limbs is visible. (Gr. derma, the skin.)

Detonant. - Emitting a sudden noise. (L. de, and tono, to thunder.)

Deuto-. - From the Greek deuteros, second, and used as a prefix.

Deutocerebræ. - The second segment of the head, the antennal segment, whose appendages develop into feelers, appearing first behind the mouth, but moving as growth proceeds. (Gr. deuteros, second; and L. cerebrum, brain.)

Deutocerebron. - The mid-brain, consisting of the olfactory nerve-centres. (Gr. deuteros, second; and L. cerebrum, brain.).

Di-. - A Greek prefix signifying double or two. (Gr. dis, twice.)

Dia-. - A Greek prefix signifying through.

Diaphanous. - Transparent, but less purely than hyaline. (Gr. diaphanes.) See Pellucid.

Dichotomous. - Dividing regularly into pairs. (Gr. dicha, in two parts, and temno, to cut.)

Didymous. - When a pair of spots, etc., touch, or are confluent; twin. (Gr. didymos, twin.) See Geminous.

Diffracted. - Bending in different directions. (L. dis, apart, and frango, to break.)

Diffuse. - Spreading. (L. diffundo, to pour abroad, from dis, away, and fundo, to pour.)

Digitate. - Widened and divided like the hand, if slender and elongate; if not slender and elongate the term “palmate” is used. (From L. digitus, a finger or toe.)

Digitules. - Appendages usually present on the feet of the Coccidæ, either broadly dilated or in the form of knobbed hairs. (From L. digitus.)

Digitus. - The toe or “foot”; the remaining joints of the tarsus taken together. (L.)

Dilatate. - Disproportionately broad in part. (L. dilato, dilatus, to make broad.)

Dilutus. - Pale in colour. (L. diluted.)

Dimerous. - Composed of two pieces; in parts arranged in pairs. (Gr. di, and meros, a part.)

Dimidiate fascia. - A fascia traversing only half the wing. (L. dimidium, the half, from dis, and medius, the middle; and fascia, a band.)

Dimidius. - Half an inch. The term is universally used to indicate “half the size.” (For example, dimidio minus, half as large; dimido majus, by one half larger; dimido latus, by one half broader, etc.) In the same way the comparative numerals are applied, triplex, quadriplex, etc. Thus, one third as large, triplo-minus; three times as large, triplo-majus; one-fourth as large, quadruplo-minus; four times as large, quadruplo-majus. Quincuplex and sextuplex are seldom, if ever, used. (L.)

Dimorphic, Dimorphous. - Presenting two distinct types in the same sex. (Gr. di, and morphe, form.)

Dioptrate. - Applied to an ocellate spot, of which the pupil is divided by a transverse line.

Dioptrate ocellus. - A fenestrate ocellus divided by a transverse line. (From Gr. dia, through; and optomai, to see.)

Diptera. - A family of hexapoda. An order of insects including the true flies, as the common house-fly, which possess only two wings and two halteres. (Gr. di, two, and pteron, a wing.)

Dis-. - A Latin prefix, denoting separation, a parting from; away; and having therefore the force of a privative and negative.

Disc. - The middle of the central portion. (L. discus.)

Disc. - The centre of the superficies externa. (L. discus, and from caro, flesh.)

Discal cell. - (Wing.) See Cellula discoidalis.

Discoidal. - Pertaining to the disc; like the disc in form. (L. discus, and eidos, like.)

Discoloured, Discolorate. - When the same part of an insect has different colours. For example, legs are called discoloured when the anterior are red and the posterior black. (L. dis and color, colour.)

Discrete, Discreted. - The term used to show one part is well defined, or marked off from the other. (L. discretus, to separate.)

Discus. - The central portion of the wing. (L. discus.) See Costal region.

Discus of Maxilla. - The disc or stalk of the maxilla, the second portion adjoining the insertion. (L. discus, and maxilla, the jaw.) See Insertion.

Discussating. - Nerve fibres crossing each other. (L. dis, and quatio, to shake.)

Dispersed. - Having the surface markings resembling spots standing apart. (L. dis, and spargo, sparsum, to scatter.)

Dissilient. - Bursting open elastically. (L. dis, and salio, to leap.)

Distant. - When parts are separated from each other by a suture, or incisure. (Fr. distant, - distans, pres. pt. of distare, to stand apart).

Distant (ant. distantes). - (Antennæ.) - The term used when the base of the antennæ are placed very widely apart. (L. dis, and sto, to stand).

Distichous (distichæ). - (Antennæ.) When the processes of a pectinate antenna originate from the apex of the joint, and do not incline at right angles to the sides, but bend forwards at acute angles. (From Gr. dis, twice, and stichos, a row.)

Distinct. - When spots, puncta, granules, etc., do not touch, or run into each other, but are individually separate. (O. F. distinct, - L. distinctus, distinguished.)

Divaricate. - Used of two parts that are contiguous at the base and very strongly dihescent; forked, or parted into two branches. (L. dis, and varico, to straddle.)

Divaricate. - Standing out very wide. Forked or divided into two branches. Branching off so as to form an obtuse angle above and an acute angle below. (L. dis, and varico.)

Diverticula. - A hollow appendage branching from the intestinal canal, and terminating in a cul de sac. (L. diverticulum, a by-road, or digression.)

Dolabriform. - Hatchet-shaped. Flat, with a prominent keel and cylindrical base. (L. dolabra, an axe, and forma, shape.)

Dorsal. - Pertaining to the back, or upper surface. (From L. dorsum, the back.)

Dorsal segments. - Transverse segments of the back, the sides of which often lap over and cover those of the ventral segments. (L. dorsum, and seco, to cut.)

Dorsal spiracles. - Lateral breathing pores seen in the dorsal segments, and which are often covered by the preceding segment. (L. dorsum, and spiritus, breath, from spiro, to breathe.)

Dorsal vessel. - A slender tube opening from the hindermost chamber of the heart, and running the length of the abdomen on the median line, being attached to the dorsal wall of the segments by several triangular muscles. (L. dorsum, and M.E. vessel.)

Dorsolum. - That portion of the superior surface which lies between the collare and scutellum, upon which are found the pteropega. (L. from dorsum, the back.)

Dorsum. - The inner margin of a wing. (L.)

Dorsum. - The back, or upper part of the body. (L.)

Double ocellus. - When two eyes of colour are included in the same circle or spot. (L. duo, two, and plus, or plenus, full, from pleo, to fill, and ocellus, a little eye.)

Ductus ejaculatorius. - The ejaculatory duct. (L.)