between veins of net-veined insects.

Argentate: shining, silvery white.

Argenteous: silvery.

Argillaceous: of the texture, appearance or color of clay.

Arid: Applied to regions in which the normal rainfall is insufficient to produce ordinary farm crops without irrigation, and in which desert conditions prevail: see humid.

Arid transition area: comprises the western part of the Dakotas, northern Montana east of the Rockies, southern Assiniboia, small areas in southern Manitoba and Alberta, the higher parts of the Great Basin and the plateau region generally, the eastern base of Cascade Sierras and local areas in Oregon and California.

Arista: a specialized bristle or process on antennae of certain Diptera.

Aristate: Diptera; that type of antennae that bears an arista: = athericerous.

Aristiform: of the form or appearance of an arista.

Armature: applied to the spinous or chitinous processes on the legs, body or wings; or the corneous parts of genitalic structures.

Armatus: set with spines, claws or other chitinous processes.

Armillate: with a ring or annulus of raised or different tissue.

Arolium -ia: cushion-like pads on the tarsi of many insects: one of the lobes of the pulvillus; in Orthoptera, used only for the terminal pad between the claws: see empodium; pulvillus; palmula; plantula; onychium, paronychium, pseudonychium.

Arquate: see arcuate.

Arrhenotokous: capable of producing male offspring only, as in worker bees and some saw-flies.

Arrhenotoky: parthenogenetic reproduction when the progeny are all males: see thelyotoky and deuterotoky.

Arthrium: Coleoptera; the minute, concealed tarsal joint in pseudotetramera and trimera.

Arthroderm: the outer skin or covering of articulates.

Arthrodial: an articulation that permits motion in any direction.

Arthromere: a body segment or ring: = somite.

Arthropleure: the side piece of an arthromere.

Arthropods: all those articulates having jointed legs.

Article: a joint or segment.

Articular pan: the cup or dish-like depression forming the socket into which an articulation is fitted.

Articulate: that branch of the animal kingdom whose members are made up of rings, segments or articulations.

Articulate: divided into joints or segments.

Articulated apex: see clasp filament.

Articulation: the point or place where two parts or segments are joined: also applied to an individual joint or segment.

Articulatory epideme: the partly chitinized membrane by which the wings are attached to the thorax.

Artus: the organs of locomotion generally.

Asexual: applied where the reproductive organs are incompletely developed and eggs or young are produced by cell-budding: = parthenogenetic.

Ash-gray: a mixture of black and white, with a faint orange tinge: like ashes of anthracite coal.

Aspect: indicates the direction to which a surface faces or in which it is viewed; it may be dorsal, ventral, caudal, cephalic or lateral.

Asperities: surface roughenings or dot-like elevations.

Aspersus: rugged, with distinct elevated dots.

Assembling: gathering together; applied when a virgin female is exposed to attract such males as may be near, either to secure a pairing or merely to obtain specimens; also called sembling.

Assurgent: down-curved at base, then upcurved to an erect position.

Asymmetrical: not alike on the two sides; not symmetrical.

Asymmetry: a state of unlikeness in lateral development; absence of symmetry in form or in the development of members.

Ater: deep black; not shining.

Aterimus: the deepest black.

Athericerous: see aristate.

Atom -us: a minute dot or point.

Atomarius: with minute dots or points.

Atrachelia: Coleoptera in which there is no visible constriction between head and prothorax: Rhynchophora and some Heteromera.

Atrium: a chamber just within the spiracle and before the occluding structure to the trachea.

Atrocoeruleus: very deep, blackish, sky-blue.

Atrophied: wasted away; unfit for use.

Atropurpureus: dark purplish, nearly black [an admixture of mauve and black].

Atrous: jet black.

Atrovelutinus: velvety black.

Atrovirens: dark green, approaching blackish [prussian green].

Attenuated: drawn out; slender; tapering.

Attingent: touching.

Atus: suffix; denotes possession of a quality or structure.

Atypic -ical: off type; not of the usual form.

Auchenorhynchus: with the beak issuing from the inferior portion of head, as in Homoptera.

Auditory: relating to the sense of hearing.

Auditory organs: Orthoptera; specialized structures covered by a tense membrane, on the anterior tibia or base of abdomen; any structure that functions as an ear.

Aurantiacus: orange colored; a mixture of yellow and red [chrome orange].

Aurate: with ears or ear-like expansions: also = auratus.

Auratus: golden yellow [pale cadmium yellow].

Aurelia: = chrysalis or pupa; specifically of butterflies.

Aurelian: a lepidopterist.

Aureolate: with a diffused colored ring.

Aureole: a ring of color which is usually diffuse outwardly.

Aureous -eus: gold-colored.

Aurichalceous: brassy yellow.

Auricle -cula: an appendage resembling a little ear; in Odonata the tumescent area at the sides of the second abdominal segment: in Andrenidae, a short membranous process placed laterally on the ligula.

Auricular: applied to the space or cavity surrounding the dorsal vessel.

Auriculate: with an ear-like appendage or, in antennae, with the basal joint distended into a concave, plate-like ear which envelops the rest of the structures.

Auriculo-ventricular: the outer valves of the heart between the auricular space and the chamber.

Auriculo-ventricular openings: are the lateral openings into the heart by means of which the blood is admitted into it.

Auritus: with two ear-like spots or appendages.

Auroral spot: applied to the bright orange colored spot at the apical area of Anthocharis.

Auroreous -eus: red, like the aurora borealis [crimson lake].

Austral: is that faunal region which covers the whole of the United States and Mexico except the boreal mountains and tropical lowlands: divided into transition, upper, lower and gulf strip: see boreal and tropical.

Austroriparian faunal area: that part of lower austral zone covering the greater part of the South Atlantic and Gulf States. Begins near mouth of Chesapeake Bay, covers half or more of Virginia, North and South Carolina, Georgia, Florida, Alabama, all of Mississippi and Louisiana, east Texas, nearly all of Indian Territory, more than half of Arkansas and parts of Oklahoma, s. e. Kansas, so. Missouri, so. Illinois, s. w. corner of Indiana and bottom lands of Kentucky and Tennessee.

Autotype: any specimen identified by the describer as an illustration of his species and compared with the type or co-type.

Auxiliary: additional, or supplementing.

Auxiliary vein: in Diptera (Will.), = subcosta (Comst.).

Axillae: two small, subtriangular sclerites at the lateral basal angles of the meso-scutellum in Proctytripidae.

Axillary: placed in the crotch or angle of origin of two bodies; arising from the angle of ramification.

Axillary area: see anal area.

Axillary