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Six morphologically distinct types of sensilla have been located on the ovipositor valves of the migratory locust. One type of sensillum has a well marked terminal pore which classifies it as a contact chemoreceptor.Behavioural experiments have clearly established that female Locustu are able to detect the presence of inorganic salts, hydrochloric acid, quinine and sucrose in their oviposition medium. However, attempts to identify contact chemoreceptors on the ovipositor were unsuccessful (Woodrow, 1965).

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