Aprostocetus gratus

Aprostocetus gratus (Giraud, 1863) Figs 24–27 Tetrastichus gratus Giraud, 1863: 1275. Tetrastichus deplanatus Thomson, 1878: 291. [Synonymized by Graham 1961: 49] Tetrastichus thomsonii Dalla Torre, 1898: 23. [Synonymized by Graham 1961: 49] Geniocerus gratus: Erdös 1956: 51. Aprostocetus gratus: Graham 1961: 49. Tetrastichus badulini Kostjukov, 1977: 191. [Synonymized by Graham 1987: 283] Material examined. • 2 females: [2 females on cards], China, Jiangsu Province, NanTong City, Coastal Levee, 4. VI. 2023, Wen-Jian Li, by sweeping, deposited in YCTU. Diagnosis. Female. Antenna (Fig. 27) with F 1 distinctly longer than F 2, 2.5 × as long as broad, F 3 apical margin oblique, dorsal edge distinctly longer than ventral edge, clava quite short, solid, obtuse apically, terminal spine downward curved and slender, ~ 0.5 × as long as the clava itself, apical seta of spine rudimentary. Forewing (Fig. 26) narrow, 2.5–2.6 × as long as broad; MV 3.9–4.0 × STV; SMV with four dorsal setae; speculum very narrow. Body (Figs 24, 25) black with bright blue metallic tint; legs yellowish with terminal tarsus brown; gaster basal 1 / 4 yellow. Male. Unknown for Chinese material. Hosts. Unknown from China. Non-Chinese records include Giraudiella inclusa (Frauenfeld, 1862), Lasioptera arundinis Schiner, 1854 (Diptera: Cecidomyiidae) (Graham 1987). Distribution. China (Jiangsu [new record], Gansu [Zhang et al. 2007]), Moldova (Bouček 1966), Romania (Tudor and Roman 1973), Austria, Netherlands, former Czechoslovakia, Denmark, Germany, Finland, France, Ireland, Hungary, Italy, Sweden, United Kingdom, Russia (Graham 1987). Comments. This species can be distinguished from other Aprostocetus species by the unique F 3 and clava.