Alula.В In insects (not birds) the outermost of the three flap-like outgrowths at the base of the wing in various flies: really a part of the wing membrane. Alternating Generations.В When two generations are produced within a life cycle each producing individuals of only one sex, either male first and then female or visa-versa. Allopatric.В Two or more forms of a species having essentially separate distributions. Alitrunk.В Name given to the thorax and propodeum of вЂwasp-waistedвЂ™ hymenopterans. Air sac.В A dilated portion of a trachea Alar Squama.В The middle of three flap-like outgrowths at the base of the wing in various flies. Age Polyethism.В The regular changing of roles of colony members as they get older. Aestivation.В Summer dormancy, entered into when conditions are unfavourable for active life i.e.

Adecticous.В Of pupa: referring to the state in which the pupa does not posses movable mandibles, the opposite being Decticous. Its shape is often important in separating closely related species. Adeagus.В The part of the male genitalia which is inserted into the female during copulation and which carries the sperm into the female. Aculeate.В (Hymenoptera) Those members of the Hymenoptera which possess a sting. Active Space.В The space within which the concentration of a pheromone or other behaviourally active substance is concentrated enough to generate the required response, remembering that like light and sound pheromones become more dilute the further they radiate out from their source. Acrostichal Bristles.В The two rows of hairs or bristles lying one on either side of the mid-line of the thorax of a true fly. Acetyl choline.В A substance present in many parts of the body of animals and important to the function of nerves. Acaricide.В A chemical employed to kill and control mites and ticks. A Abdomen.В The hindmost of the three main body divisions of an insect.

Dictionary of entomology pdf