【目的】 本文对危害合欢Albizia julibrissin Durazz的钻蛀性害虫合欢吉丁Agrilus subrobustus Saunders各虫态形态特征及危害特性进行了研究与描述，深入探索其虫道三维结构，以期为合欢吉丁的发生监测及防治提供依据。【方法】 查阅相关文献，记述整理了合欢吉丁学名的变化过程，详细地观察并描述了剖腹卵、幼虫、蛹、成虫的形态特征；首次研究总结其坑道系统的各指标特点：虫口密度、坑道长宽、侵入孔特征、蛹室特征、羽化孔特征等，明确了完整虫道的发生发展规律；基于坑道拍照、各向量指标测量，对坑道进行科学手绘，使用Autodesk Maya软件完成合欢吉丁完整虫道的三维重建。【结果】 合欢吉丁幼虫细长、乳白色，蛹为裸蛹。成虫铜绿色具金属光泽，观察对比其前胸背板长宽比、盘区和肩前隆脊形态，前胸腹板突形状，鞘翅柔毛分布位置，阳茎形态等特征，结合文献，明确其学名为Agrilus subrobustus Saunders。合欢吉丁主要危害树干韧皮部及木质部，具向阳性；在树皮下钻蛀坑道，侵入孔圆形，不超过1 mm；蛹室米粒状，多位于木质部，少数位于韧皮部；羽化孔“D”型；坑道形状具有规律性，可分为3种：“Z”字型及其变型，密集上下迂回型，椭圆或近半圆型坑道。【结论】 基于形态特征的详细描述、学名厘定，有利于合欢吉丁的鉴定及学名的正确使用；完整虫道的复原便于在非成虫期结合寄主种类鉴定害虫种类、评估虫口密度和危害程度，为合欢吉丁的监测提供了具体的判别方法，为化学防治、生物防治等提供参考与技术支持。

[Objectives]  To review the nomenclature, and describe the morphological characteristics and larval galleries of Agrilus subrobustus Saunders, a buprestid beetle that frequently causes severe damage to silk trees (Albizia julibrissin Durazz) in order to provide guidance and suggestions for monitoring and preventing damage by this pest. [Methods]  We reviewed the literature to describe the process through which the scientific name of the species was changed, and observed and described the morphological characteristics of adults, pupae, larvae, and eggs inside oviducts. We performed the first geometric index analysis of A. subrobustus’s galleries, including population density, gallery length and width, as well as characteristics of the entrance hole, pupal chamber, and emergence hole. The morphology, and frequency of occurrence and development of complete galleries were analyzed. Based on photographs of galleries and geometric vector indices, proportionally accurate drawings of galleries were made and three dimensional reconstructions completed using Autodesk Maya. [Results]  The larvae of A. subrobustus are ivory colored and slender. Pupae are of the exarate type and adults are shiny and greenish. Features of adult morphology, including the shape (length versus width) of the pronotum, pronotum disk, prehumerus, metasternal projection, elytra pubescence distribution, and aedeagus, are described. The scientific name was clarified through detailed morphological comparisons and consultation of the literature. A. subrobustus damages both the phloem and xylem of A. julibrissin, and is active on the sunny side of host trees. A. subrobustus bores galleries under the bark of its host, with round shaped entrance holes measuring less than 1mm. Pupal chambers were oval shaped and mostly distributed in the xylem of the host with a minority in the phloem. Emergence holes were “D” shaped. Generally galleries could be divided into three types on the basis of morphological characters; i.e. a “Z” shaped, or extended, type, a vertically rounded type, and an ellipse or semicircular, type. [Conclusion]  Clarification of the morphological characteristics and scientific name of A. subrobustus should aid future identification of this beetle. The three dimensional reconstruction of its larval gallery structure will also aid identification and assessment of damage to host trees, and provide technical guidance for the monitoring and control of this pest.