Influence of Host Movement on Selection of Hosts byDrino bohemicaMesn. (Diptera: Tachinidae) as Determined in an Olfactometer

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Abstract
Two, or possibly three, types of stimuli that may influence host selection by entomophagous insects are produced by movements of the host or the prey. Movement may provide visual or tactile stimuli. Vibration caused by host movement may stimulate some species.Tactile stimuli are produced by a host if it moves when touched by a parasite and are usually provided by a host that is enclosed in a case or a cocoon. Ullyert (1936), working withDahlbominus fuscipennis(Zett.), and Williams (1951) and Thorpe and Jones (1937), working withIdechthis canescens(Grav.), found tactile stimuli an important factor in host selection, but Simmonds (1943) and Thompson and Parker (1927) concluded it was of little importance inI. canescensandMelittobia acastaWalk. respectively. Movement of potential prey upon contact stimulates attack by foraging ants (Vowels, 1955). Tactile stimuli produced by movement of the host may indicate an unsuitable host to the egg parasiteTrichogramma evanescensWestw. (Salt, 1938).