Small hymenopteran insects , 3.0 mm long. Head and chest are dark brown; legs and scapus yellow (scapus without brown lateral longitudinal stripe), brown flagellum with apical white 3-5th flagellomeres. Metasomal tergites 1–4 are brown, tergites 5–7 are yellow. Vertex and forehead transversely furrowed; 4th-7th metasomal tergites are smooth. Granulated scutellum, smooth mesopleuron, furrowed face. Malar space less than 0.25 of eye height. The number of flagella is unknown. The distance between the ocellium and the compound eye is approximately 2.5 times the diameter of the lateral ocellium. The ovipositor is approximately 75% of the length of the abdomen. In the front wing, a radio-medial vein is developed. Fore tibia with single row of short spines along anterior margin. On the hind coxae of the legs there is a distinct anteroventral basal protrusion; the vertex of the head on the side of the eye is not sharply angular. Presumably, like other species of the genus Heterospilus , parasitize on beetles or butterflies. The species was first described in 2013 by the American hymenopterologist Paul Marsh ( Paul M. Marsh ; North Newton , Kansas , USA ) with a group of American fellow entomologists ( Wild Alexander L. , Whitfield James B .; University of Illinois at Urbana-Champaign , Erbana , Illinois , USA) and is named after Charles Thomas Brues , a large American specialist in poaching riders ( CT Brues , 1879–1955), who described many new taxa of these insects in the 1900s. Heterospilus bruesi is distinguished from closely related species by the partial furrowing of the apical tergites of the abdomen, as well as the venation of the wings (the vein r of the anterior wing is shorter than the vein 3RSa; the vein SC + R is present in the hind wing, and the vein M + CU is equal to the length of the 1M vein) [1] .