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To uncover the relationship between chemical receptors and behaviors of the erythrina gall wasp (EGW), Quadrastichus erythrinae Kim (Hymenptera: Eulophidae), and to elucidate the chemical connections between the parasite and the host plant, the present study focused on determining the types, morphologies and distributions of the various antennal sensilla of adult EGW. With scanning electron microscopy and 3-dimensional microscopy, we found that the antennae of EGW adults have 6 kinds of sensilla, namely, sensory pore sensilla, chaetica sensilla, multiporous plate sensilla, trichoid sensilla, basiconic capitate peg sensilla and uniporous trichoid sensilla. Both the male and female wasps have these 6 kinds of sensilla. However the types and numbers of sensilla on the funicle and clava differed between males and females, but such a difference was not seen on the scape and pedicel between the 2 sexual genders. We found one kind of sensillum located on the end of pedicel of Q. erythrinae Kim that has not been described previously. The results of our research may aid use of EGW in the biological control of undesirable Erythrina spp. trees. [ABSTRACT FROM AUTHOR]