none Enter Diachasmimorpha longicaudata (Ashmea) (Hymenoptera: Braconidae) is an obligate endoparasitoid of third instar larvae of many fruit flies (Diptera: Tephritidae). The antennal sensilla of D. longicaudata were observed with scanning electron microscopy. Seven distinct types of sense receptors were observed, including sensilla squamiformia, Bohm bristle, sensillum trichodea, sensilla coeloconica, sensillum styloconicum, sensillum campaniformium, and sensilla placodea. Three forms of sensillum trichodea (ST I, ST II and ST III) (Str I, Str II, Str III) and two forms sensillum styloconicum (SS I and SS II) (Sst I and Sst II) were found. However, SS II (Sst II) were only observed on the antennal of female wasps. Sensilla trichodea and sensilla placodea were distributed widely on the antenna with large amount. noneEmail20150306 (jiachengbai@stu.scau.edu.cn)