l spaces 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 epi