Antrorse -sum: directed toward the front.
Anus: the end of the digestive tract, through which the food remnants are passed: the posterior part of the individual: specifically, in Coccidae, a more or less circular opening on the dorsal surface of the pygidium, varying in location as regards the circumgenital gland orifices: = anal orifice.
Aorta: the anterior, narrow part of the heart, opening into the head.
Apex: that part of any joint or segment opposite the base by which it is attached; that point of a wing furthest removed from base or at the end of the costal area.
Aphaniptera: indistinctly winged; see Siphonaptera.
Aphidilutein: a yellowish fluid found in plant lice, changed to a rich violet by alkaline reagents.
Apical: at, near or pertaining to the apex; usually of a wing.
Apical areas: apical cells in some Homoptera.
Apical cell: a cell near or at the apex of a wing; in Hymenoptera (Norton) = medial (Comst.); outer apical cell = 2d medial 2 (Comst.); inner apical cell = medial 3 (Comst.).
Apical cells or cellules: Trichoptera; the series of cells along the outer margin of wing from pterostigma to arculus.
Apically: toward or directed toward the apex.
Apical sector: one of the longitudinal veins in the apical part of wing of Neuroptera.
Apical transverse carina: Hymenoptera; crosses the metanotum behind middle and separates the median from the posterior cells or areas.
Apiculate: covered with fleshy, short points.
Apneustic: without an open tracheal system; respiration is through the skin or through tracheal gills.
Apodal: with single, simple tubercles instead of feet, in larvae; without feet = apodous.
Apodema: a conspicuous transverse band crossing the thorax in front of the scutellum in male Coccidae.
Apodeme: an inwardly directed process to which a muscle is attached.
Apolar: without differentiated poles; without apparent radiating processes applied to cells.
Apophysis: the lower of the two joints of trochanter in ditrocha trochanterellus; the dorso-lateral metathoracic spines in Hymenoptera; also used as synonymous with ento-thorax.
Apophystegal plates: Orthoptera; flattened blade or plate-like sclerites covering the gonapophyses.
Appendage -es: any part, piece or organ attached by a joint to the body or to any other main structure.