Abstract: Sycophaga sp. is a species-specific and galling parasite at the pre-female floral stage of Ficus auriculata. To provide a prerequisite for future electrophysiological studies on the fig wasp chemoreception, the antenna of female Sycophaga sp. was excised and examined by the sanning electron microscopy. The results showed that the antennae of Sycophaga sp. is geniculate in shape and consist of the basic segments: scape with radicula, pedicel and a long threadlike flagellum subdivided into 11 flagellomeres. The total antenal length is （1342.5±96.5）μm. Six sensillar types were recorded and described on the antennae of female Sycophaga sp.. The identified sensillar types included trichoid sensilla, chaetica sensilla, uniporous and multiporous basiconic sensilla, basiconic capitate peg sensilla, and multiporous placoid sensilla. Most sensilla were located on the outside laternal side and ventral side of the antennae. According to the abundance, trichoid sensilla and multiporous placoid sensilla were regarded as the main sensillar type on the antennae of the female wasps. The former was distributed over the whole area of antennal segments, except for the radicula, but the latter presented the equal number of sensilla on the 3rd-11th flagellomeres. Their probal functions were discussed in view of sensillar type, distribution and oviposition behavior of Sycophaga sp..

Key words: Ficus auriculata, pre-female floral stage, non-pollinating fig wasp, Sycophaga sp., antennal sensilla