The sense organs on antenna of the egg parasitoid Trichogramma evanescens (Hymenoptera: Trichogrammtidae) were investigated using a scanning electron microscope. The antennal sensilla showed strong sexual dimorphism as their number and types differed in female and male insects. The antenna of the female displayed 14 types of sensilla: basiconic capitata peg (types 1 and 2), campaniform, chaetica (types 1-3), coeloconic, falcate, placoid (types 1 and 2), styloconic and trichoid (types 1-3). The male antenna exhibited 12 types of sensilla which were: basiconic capitata peg (types 1 and 2), campaniform, chaetica (types 1- 3), coeloconic, placoid (types 1 and 2) and trichoid (types 3 -5). The falcate and styloconic sensilla were only observed on the female antenna, meanwhile, trichoid sensilla types 4 and 5 were only detected on the male antenna. Variation in the structure and distribution of antennal sensilla   in both sexes are discussed, and also their function suggested. The survey could be used as a key for identification of Trichogramma spp.