Acutilingues: bees with a short pointed tongue: see obtusilingues.
Addorsal: close to but not quite on the middle of the dorsum.
Addorsal line: in caterpillars, is longitudinal, a little to one side of the dorsal and between it and the subdorsal line.
Adductor: applied to muscles that draw an appendage to the body or bring parts into apposition: see abductor.
Adductor mandibulae: the muscle that draws in or closes the mandible.
Adeloceratous: with concealed antennae: see cryptocerata.
Adephagous: belonging to the Adephaga: pentamerous, predatory, terrestrial beetles with filiform antennae and predatory habits: see hydradephagous.
Adiscota: insects that develop into adults without forming imaginal discs; see discota.
Adminicula: supports or props: the spinous processes on the abdomen of boring and burrowing pupae.
Adnate: adjoining; adhering or growing together: closely connected.
Adpressed: laid or pressed to; contiguous.
Adsperse -us: with markings of closely crowded small spots.
Adsternal: situated next or close to the sternum.
Adult: the stage when an insect is sexually mature and ready to reproduce normally.
Aduncate -cus, -catus: a part gradually bent through its whole extent.
Adventitious: occurring accidentally, out of 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).
Aenescent: becoming or appearing bronzed or brassy.
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].
Afferent: carrying inwardly or toward the centre.