Explanation of Terms Used in Entomology | Page 9

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 calli: see calli axillary.
Axillary cell: in Diptera (Will.), = 2d anal (Comst.).
Axillary excision: = a. incision, q.v.
Axillary incision: Diptera; an incision on inner margin of wing, near
base, which separates the alula from the main part.

Axillary lobe: the sclerite covering the base of the wing in Diptera; see
also alula and posterior lobe.
Axillary vein: one or two longitudinal veins toward the inner margin
from the anal vein (Ephemeridae); a group of several (10-20) radiate
veins that occupy the anal field in Orthoptera.
Axis: a small process at base of elytron, upon which it turns.
Azure -eus: clear sky-blue [cobalt blue].
Azygos: unpaired; a structure without a fellow; sometimes applied to
an unpaired