Explanation of Terms Used in Entomology | Page 8

bearing appendages; said of antennae where the joints
have articulated appendages; of tarsal claws that have membranous
processes at base.
Appendiculate cell: Hymenoptera; is on costa just beyond 2d radius 1
and 2.
Appendigerous: bearing appendages.
Appendix: a supplementary or additional piece or part, added to or
attached to another: in Heteroptera; = cuneus, q.v.
Appress -ed: to press against; closely applied to.
Approximate: near to; applies to antennae inserted close together.
Aptera: those that have no wings: an ordinal term formerly employed
for fleas, lice and other wingless forms now distributed in other orders:
later used for the simplest or lowest insects, including the Thysanura
and Collembola.
Apterodicera: wingless, with two antennae.
Apterous: without wings.
Apterygogenea: those insects that are wingless in all stages and
presumed to be descended from ancestors which never were winged:
see pterygogenea.
Apterygota: = apterygogenea; see pterygote.
Aquamarine -us: sea green: pale green with predominant blue and a
little gray [nile green].
Aquatic: living wholly in water.
Aquatilia: cryptocerous Hemiptera of truly aquatic habit.
Arachnoideous: resembling or similar to a cobweb.

Araneiform: spider-like in appearance.
Arboreal: living in, on, or among trees.
Arborescent: branching like the twigs of a tree.
Archaic: ancient; no longer dominant; of the olden time.
Archiptera: those Neuroptera with incomplete metamorphosis =
Pseudo-neuroptera.
Arctic Zone: is that part of the boreal region above the limit of tree
growth in the U. S. is restricted to the area above timber line on the
summits of high mountains: = alpine.
Arcuate: curved like a bow: = arcuate.
Arcuato-emarginate: with a bow-like or curved excision.
Arculus: Odonata; a small cross vein between radius and cubitus near
the base, leaving an elongate triangle between them: Trichoptera; a
point, often hyaline, on the forewing where the cubitus (or post cubitus)
runs into the margin: in Homoptera; a cross-veinlet nearly reaching
posterior margin at same point as in Trichoptera: in other orders
applied to a cross-vein in similar position, apparently giving rise to the
median.
Arcus: a bow; part of a circle; but less than one half.
Area mediastinal, scapularis and ulnaris: the areas in front of the
mediastinal, the scapular, and the ulnar veins in Orthoptera.
Areae or Areolae: wing cells or spaces between veins.
Arenicolous: applied to species frequenting sandy areas.
Arenose: a surface that is sandy or gritty.
Areola: a small cell on the wings of certain Hemiptera: see also areae

Hymenoptera; the central of three median areas on the metanotum: =
2d median area; upper median area.
Areolate: with small defined areas, like a network.
Areole: Lepidoptera; see accessory cell, cell and cellule.
Areolet: one of the small 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 epideme: the partly chitinized membrane by which the
wings are attached to