Explanation of Terms Used in Entomology | Page 4

the ordinary course,
without apparent reason.
Adventral line: in caterpillars, extends along the under side between the
middle and the base of legs.
Adventral tubercle: on the abdominal segments of caterpillars on the
inner base of the leg, and correspondingly on the apodal segments;
constant: is number VIII of the abdominal series (Dyar).
Aeneous -eus: shining bronze or brassy.
Aenescent: becoming or appearing bronzed or brassy.
Aequale: equal.
Aequilate-us: of equal breadth throughout.
Aerial: living in the air; applied to flying insects.
Aeriductus: a spiracle: the tracheal, gill-like structures of aquatic larvae:
more specifically the tail-like extensions of rat-tailed maggots and
some aquatic Hemiptera.
Aeroscepsin: an indefinite sense of perception supposed to be located
in the antenna.
Aeroscepsy: The faculty of observing atmospheric changes: supposed
to be located in the antenna.
Aerostats: a pair of large air sacs at base of abdomen in Diptera.
Aeruginose -us: the color of verdigris [blue green].

Aestival: occurring in summer.
Aestivation: applied to summer dormancy.
Afferent: carrying inwardly or toward the centre.
Affinis: related to: similar in structure or development.
Afternose: a triangular piece below antennae and above clypeus: see
postclypeus.
Agamic -ous: reproducing without union with a male.
Agamogenesis: reproduction without fertilization by a male: see
parthenogenesis; gamogenesis.
Agglomerate: heaped or massed together.
Agglutinate: stuck or glued together; welded into one mass.
Aggregated: crowded together as closely as possible.
Agnathous: without jaws; specifically applied to those Neuropteroid
series in which the mouth structures are obsolescent.
Aileron: the scale covering the base of primaries in some insects; see
tegulae in Diptera = alula and squama, q.v.
Air-sacs or vesicles: pouch-like expansions of tracheal tubes in heavy
insects, capable of inflation and supposed to lessen specific gravity.
Air-tube: a respiratory siphon.
Ala -ae: a wing or wings.
Alar appendage: see alulet.
Alar frenum: a small ligament crossing the supra-alar groove toward
the root of the wing: Hymenoptera.

Alary: relating to the wings: applied also to the wing muscles of heart.
Alate -us: winged; with lobes similar to wings in appearance though
not necessarily in function.
Albi, albus: white.
Albicans: formed or made of white.
Albidus: white with dusky tinge.
Albinic: of the character of an albino.
Albinism: that condition in which there is an absence of color or a
whitening in a form usually colored.
Albino: a colorless individual of a species that is normally colored.
Albumen: the white of egg or the substances in the tissues which have
the same characteristics.
Albumin: the characteristic substance forming the white of egg.
Albuminoid: like or of the character of albumen.
Alimentary canal: the digestive tract as a whole; begins at the mouth
and extends through the body to the anus.
Alitrunk: that part of the thorax to which the wings are attached: in
many Hymenoptera, includes the 1st abdominal segment.
Alizarine: a transparent, orange red [alizar crimson].
Alleghanian faunal area: is that part of the transition zone comprising
the greater part of New England, s. e. Ontario, New York, Pennsylvania,
Michigan, Wisconsin, Minnesota, eastern N. Dakota, n. e. S. Dakota,
and the Alleghanies from Pennsylvania to Georgia.
Alligate -us: fastened or suspended by a thread; like the chrysalis of

Papilio, etc.
Alliogenesis: when the development includes an alternation of
generations (q.v.), as in Cynipids.
Alluring glands: glandular structures diffusing an odor supposed to be
attractive to the opposite sex.
Allux: next to the last joint of tarsus; in Rhynchophora.
Alpine zone: = arctic zone, q.v.
Alternation of generations: where a species that occurs in both sexes
periodically produces only parthenogenetic females; the latter, in turn,
producing the sexed form; occurs in Cynipidae and some Homoptera:
see heterogeny.
Altus: above: applied to a part raised above the usual level.
Alulae: Diptera; a pair of membranous scales above the halteres, behind
the root of the wing, one above or before the other; the anterior
attached to the wing and moving with it, the posterior fastened to the
thorax and stationary; see calyptra; squama; squamula; lobulus; axillary
lobe; aileron; scale; tegulae: Coleoptera; a membranous appendage of
the elytra which prevents dislocation.
Alulet: Diptera: the lobe at basal posterior part of wing; = alar
appendage; posterior lobe: and has been used as = alula.
Alutaceous: rather pale leather brown [burnt sienna]: covered with
minute cracks, like the human skin.
Alveolate: furnished with cells: deeply pitted.
Alveolus: a cell, like that of a honeycomb.
Amber: a transparent, clear, pale yellowish brown; of the color of
amber [a mixture of pale cadmium yellow and a little burnt umber].

Ambient vein: Diptera; the costal vein when it extends beyond the apex
and practically margins the wing.
Ambrosia: bee-bread: the food cultures of certain Scolytid beetles.
Ambulatoria: that series of Orthoptera in which the legs are fitted for
walking only; Phasmids.
Ambulatorial: fitted for walking or making progress on the surface.
Ambulatorial setae: specialized hairs or bristles, situated