A new species of Hyperimerus Girault from China, with a key to species of the genus (Hymenoptera, Chalcidoidea, Pteromalidae) Author Yang, Lan Author Huang, Da-wei Author Xiao, Hui text ZooKeys 2019 817 105 112 http://dx.doi.org/10.3897/zookeys.817.29886 journal article http://dx.doi.org/10.3897/zookeys.817.29886 1313-2970-817-105 75E77E8044D24BADB9870248726B4EB3 Hyperimerus pusillus (Walker, 1833) Cyrtogaster pusilla Walker, 1833: 383. Holotype female (BMNH No. 3300), examined. Hyperimerus pusillus (Walker): Graham 1969 : 83; Boucek 1993 : 1306; Huang and Xiao 2005 : 281-282; Schender et al. 2014 : 414-417. Mespilon exiguum Graham, 1957: 406. Synonymized by Graham 1969 : 83. Diagnosis. Female. Body (Fig. 7, 8) length approximately 1.5 mm, dark green. Head width 1.32 x height in frontal view. Eyes height 0.58 x head height; eyes separated by 1.07 x their height. Gena with malar sulci distinct, malar space 0.55 x eyes height. Antenna (Fig. 9) with scape reaching anterior ocellus; pedicel and flagellum combined 1.2 x head width; pedicel broader than Fu1, clava shorter than length of Fu5 - Fu7 combined. Scutellum with frenum ca. 1/3 length of scutellum. Propodeum with areolate sculptures irregular and sparse, most of sculptures 2 x as big as propodeal spiracles (Fig. 10). Marginal fringe of outer margin of fore wing shorter than length of uncus; marginal vein shorter than postmarginal vein (0.59 x ), postmarginal vein approximately 1.85 x as long as stigmal vein. Petiole 0.4 x as long as broad. Gaster 1.91 x as long as broad; narrower than thorax, shorter than the length of head and mesosoma combined. Ovipositor sheaths slightly produced in dorsal view; gaster in lateral view, ovipositor sheaths 0.26 x length of gaster, 0.44 x length of hind tibia. Figures 7-10. Hyperimerus pusillus (Walker, 1833) 7 Body in dorsal view 8 Body in lateral view 9 Head and antenna in lateral view 10 Propodeum in dorsal view. Material examined. China, 1♀2♂, Sichuan: Kangding, 15.VI.2017, leg. Yanzhou Zhang (Hyp-2018-07, original number ZYZ-2017-28; Hyp-2018-09, original number ZYZ-2017-29); 1♀, Sichuan: Kangding, 2.VIII. 2017, leg. Yanzhou Zhang (Hyp-2018-04, original number ZYZ-2017-21); 1♀, Sichuan: Kangding, 29.VI.2017, leg. Yanzhou Zhang (Hyp-2018-11, original number ZYZ-2017-42); 1♂, Tibet: Zhamo, 2700m, VII. 19.1978, leg. Fasheng Li. Hosts. Parasitoids of Psylla pyricola ( Ghahari et al., 2010 ), Phenacoccus aceris , Psylla ulmi (Dzhanokmen, 1978). Distribution. China (Sichuan, Tibet), Holarctic, Oriental, and Neotropical regions.