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Olfactory Stimuli and Oviposition in the Blowfly, Phormia Regina Meigen
1 Zoological Laboratory, University of Pennsylvania, Philadelphia; Department of Physiology, Marischal College, Aberdeen
1. The work described attempts to elucidate the sensory mechanisms involved in the act of oviposition.
2. A brief account of the morphology of the ovipositor and the distribution of the various sensilla on it is given.
3. Behavioural experiments have shown unequivocally that receptors on the anal leaflets of the ovipositor are olfactory and can mediate oviposition. Flies are able to discriminate when antennal, palp and labellar receptors are blocked, but not when the ovipositor pegs are waxed over as well. A method for waxing the latter is described.
4. Sensilla on the antennae, labellum and ovipositor perceive the olfactory stimuli which are important in inducing oviposition. Possibly there are olfactory receptors at other sites which mediate other types of behaviour.
5. Tactile stimuli perceived mainly through sensilla on the ovipositor can play an important role in egg distribution and a minor role, possibly, in inducing oviposition.
6. All the evidence suggests the pegs are the olfactory receptors on the ovipositor which mediate oviposition.
7. A summary of factors known or suspected to influence oviposition is given.
Submitted on March 27, 1962