关键词: 新疆寡索赤眼蜂属; 赤眼蜂科; 比较形态学; 物种鉴定

Abstract: 【Objective】 Trichogramma wasps that belong to genus Oligosita are difficult to identify because of not obvious morphological difference features, owing to their minute body size and varying but vague morphological characters between species. In this study, we attempt to solve this problem by comparative morphological research, and to obtain reliable morphological features for accurate identification of Oligosita wasps, which could be utilized to control many significant pests as natural enemies.【Method】Eight species of Oligosita wasps in Xinjiang were mounted on glass microscope slides for observation, after which 40 morphological characters were selected for interspecific comparison.【Result】Eighteen characters with strict interspecies specificity were capable to be applied to taxonomic studies, including colour of compound eyes, colour of ocellus, the length-width ratio of funicle, the shape of funicle, the length-width ratio and the shape of club, the shape of club, the number of placoid sensilla on third segment of club, the number of seta on premarginal vein, the presence/absence costal cell, the presence/absence of seta in costal cell, the number of seta in costal cell, presence/absence of microtrichia seta blow marginal vein, the length-width ratio of forewing, the radio of fringe length of forewing to forewing width, the shape of stigma, the shape of the front margin of apical of forewing, the length radio of hind tibia to ovipositor, the presence/absence of apodemes on male genitalia.【Conclusion】The morphological characters mentioned above could be used in taxonomic study of genus Oligosita, especially in identification of some morphologically similar species.

Key words: Oligosita Walker of Xinjiang; Trichogrammatidae; comparative morphology; specific identification