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.
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.
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.
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.
Atropurpureus: dark purplish, nearly black [an admixture of mauve and black].
Atrovirens: dark green, approaching blackish [prussian green].
Attenuated: drawn out; slender; tapering.
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.