الفهرس 
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Abstract
In the present study, the structure and innervation of the olfactory receptors of the moth spodoptera littoralis have been investigated. A general screening is made for 55 volatile oils which prove to occur in the flowers and leaves of various plants. Some of these oils are attractive to both sexes. The non-volatile fractions also proved to be feeding stimulants of the moth. The contact chemorecptors are located on the ventral surface of all tarsi and the distal portion of the proboscis. The structure and innervation of these receptors have been investigated. Acceptance thresholds of the moth to sugars reveals that most pentoses, hexoses, di-and trisaccuarides are stimulating. A high degree of correlation is observed between the rejection thresholds of alcohols and their physical properties. The tarsal receptors are stimulated by all sugars identified.