The genus Ismarus Haliday (Hymenoptera, Ismaridae) from China Author Zhang, Xiao State Key Laboratory of Biocontrol, School of Life Sciences / School of Ecology, Sun Yat-sen University, Guangzhou 510275, China Author Chen, Hua-yan https://orcid.org/0000-0002-0382-1635 State Key Laboratory of Biocontrol, School of Life Sciences / School of Ecology, Sun Yat-sen University, Guangzhou 510275, China huayanc@scbg.ac.cn Author Liu, Jing-xian Department of Entomology, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China Author Luo, Shi-xiao Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China text Journal of Hymenoptera Research 2021 2021-04-29 82 139 160 http://dx.doi.org/10.3897/jhr.82.62148 journal article http://dx.doi.org/10.3897/jhr.82.62148 1314-2607-82-139 8FC2D2B561424B98B5D927CF0ED854A3 A016508EC5BD5E65B5256B9967BA8890 4741605 Ismarus areolatus Chen sp. nov. Figures 2 , 3 Diagnosis. This species can be easily distinguished from other Oriental species of Ismarus by the following characters: lateral pronotal area with a submedian oblique carina; mesoscutellum areolate and posterior rim excavate with slightly prominent posterolateral corners; hind tibiae abruptly incrassate. Description. Female. Body length 2.24-3.15 mm. Colour . Body black; A1-A2 brown, remainder of antenna black; coxae of fore and mid legs black, remainder brown to yellow, with tibia and tarsi becoming paler, hind leg mostly black with trochanter dark brown; wings hyaline, veins blackish brown. Figure 2. Ismarus areolatus Chen, sp. nov., holotype, female (SCAU 3049372) A lateral habitus B head, anterior view C head and mesosoma, dorsal view D head and mesosoma, lateral view E propodeum and basal metasoma, dorsal view F apical metasoma, dorsal view. Head . Head in dorsal view 2.0 x as wide as long; vertex abruptly sloping behind ocelli; POL as long as OOL; frons with ventrolateral areas densely setose, area below anterior ocellus with scattered setae; facial transverse carina slightly convex ventrally; A3 slightly longer than A4; A4 1.2 x length of A5; A6-A14 with each segment less than 1.5 x as long as wide; A15 approximately 2.0 x longer than wide. Mesosoma . Dorsal pronotal area rugose-punctate and setose; lateral pronotal area with a submedian oblique carina, rugose ventrally, smooth dorsally; mesoscutum smooth and convex, posterior margin with relatively dense long setae; mesoscutal suprahumeral sulcus absent; humeral sulcus deep and crenulate, 1.7 x length of tegula; mesoscutellum areolate and slightly convex, posterior rim excavate with slightly prominent posterolateral corners; anterior mesoscutellar pit large and deep, as long as length of the mesoscutellar disc, distinctly crenulate posteriorly, median keel strong; mesopleuron smooth and bare, with area below tegula rugulose; metapleuron rugose and covered with dense whitish long setae. Figure 3. Ismarus areolatus Chen, sp. nov., holotype, female (SCAU 3049372) A wings B antenna C hind tibia. Wings . Radial cell completely closed, very small, 4.4 x as long as wide and 0.2 x as long as marginal vein. Legs . Fore and mid legs slender; hind tibia abruptly incrassate, its maximum width slightly wider than hind femur. Metasoma . Petiole distinctly transverse, with strong costae dorsally; base of T2 with six short costae, median furrow short, 0.15 x length of T2, remainder of T2 smooth with scattered fine punctures; T3-T7 smooth with scattered fine punctures; T8 coriaceous; sutures between tergites complete and deeply impressed. Male. Unknown. Etymology. The name refers to the areolate mesoscutellum. Material examined. Holotype , female: China : Guangdong , Guangzhou , South China Botanical Garden , forest, 23°10'49.87"N , 113°21'21.33"E , MT1, 7.iv-7.v.2020 , Jian-wei Li, SCAU 3049372 (deposited in SYSBM) . Paratype : ( 1 female ) China : Guangdong , Maoming , Yunkaishan National Nature Reserve , LSX591, MT-GD32, 22°16'38.37"N , 111°11'45.23"E , 30.iv-29.v.2020 , Long-long Chen, SCAU 3049371 (SYSBM) .