10.22376/ijpbs.2019.10.1.p1-12 Volume 8 Issue 2 2017 (April - June) Spiders are found throughout the surface of earth right from Artic to dry desert region, particularly they are found abundant in areas rich in vegetation. The evolutionary success of spiders is primarily due to their highly developed sensory system. Although there can be little doubt about the spider's ability to smell, the location of the actual olfactory organs has been under debate for long time. While several behavioral studies have emphasized the role of gustation and olfaction in spiders, very few attempts have been made to depict the functional role and structure of the chemosensilla involved lessThan i greaterThan . lessThan /i greaterThan Ultrastructural studies reveal a predominance of gustatory sensilla with a characteristic S-shape, an apical pore and arising steeply on the axis of the pedipalps and legs of spiders. The location of chemoreceptors is suitable for contacting substrates, prey or conspecifics. lessThan i greaterThan Oxyopes rufisternum lessThan /i greaterThan lessThan b greaterThan lessThan /b greaterThan is a potential predator in the agro ecosystem and thus of particular interest from the point of biological control. The present study was conducted to identify the olfactory receptors and gustatory receptors of the spider which help them to adapt and help in prey capture. There are about eight different sensilla found during the study. Their distribution patterns of individual sensillar types provides evidence for the importance of gustation and olfaction by sensilla on the pedipalps and forelegs as reported in behavioral studies in several species of spiders. Multicellular activity of individual sensilla in lessThan i greaterThan O. rufisternum lessThan /i greaterThan is similar to that described in insects but it has a greater number of active units. The activation of groups of neurons from which the individual sensitivity spectra remains unknown. DR.(MRS.).A.MARY AGNES AND DR. A.SEN Oxyopes rufisternum, sensilla, pedipalp, legs, olfaction, gustation 59-65