Abstract: The morphology and distribution of antennal sensilla were studied using scanning electron microscopy in Micromelalopha troglodyta（Graeser）. The results showed that eleven distinct kinds of antennal sensilla, including sensilla trichodea, sensilla chaetica, sensilla coeloconica, sensilla cavity, sensilla cylindric, sensilla styloconica, sensilla auricillica, sensilla furcatea, sensilla gemmiformia, Bǒhm bristle and sensilla squamiformia, were observed. Furthermore, four types of sensilla trichodea, three types of sensilla styloconica or Bǒhm bristle, two types of sensilla coeloconica, sensilla furcatea or sensilla squamiformia, and one type of the others were researched, and most of them lie on the upper and lower surfaces of the antenna. In addition, antennal sensilla were quite similar except some slight differences between the female and male individual adult. Sensilla furcatea and the second type of sensilla coeloconica werent found in the female adult antenna, while sensilla gemmiformia the first and the second type of Bǒhm bristle (BB2) werent found in the male adult antenna. Moreover, there were differences in the length and quantity of sensilla trichodea between the sexes.