Illiesonemoura motuoensis Du & Ji sp. nov. Materials Type status: Holotype. Occurrence: recordedBy: Du Yu-zhou; individualID: Insect collection of Yangzhou University (ICYZU), Jiangsu Province, China; individualCount: 1; sex: male; lifeStage: adult; occurrenceStatus: present; occurrenceID: 6B627470-E757-5D01-8D75-6DE223856414; Taxon: kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Plecoptera; family: Nemouridae; genus: Illiesonemoura; specificEpithet: motuoensis; Location: continent: Aisa; country: China; countryCode: CN; stateProvince: Tibet; county: Medog; locality: Hami-Beibeng; minimumElevationInMeters: 780; verbatimLatitude: 29.233333 N; verbatimLongitude: 95.166667 E; Identification: identifiedBy: Zhi-jie Wang, Yu-zhou Du & Xiao-yu Ji; Event: year: 2009; month: 6; day: 17; Record Level: language: en Description Male. Head and antennae slightly brown; pronotum brown, angles blunt rounded (Fig. 4). A single unbranched cervical gill on each side of mid-line (Fig. 5 A). Wings hyaline, veins brownish. Forewing length 4.8 mm, hind wing 4.0 mm. Legs brown. Abdomen pale with hairs. Tergum 10 bearing several small spines on anterior part and forming a pair of pale knobs medially, with hairs on the rounded tip (Fig. 5 B and Fig. 6 C). Hypoproct sub-quadrant with a small narrow tip; vesicle short, length 2x width. Cerci membranous, very long and thin with many hairs, upcurved in lateral view, sinuous in dorsal view (Fig. 6 A-C). Paraprocts divided into 2 lobes; inner lobe slightly sclerotised, thin and short; outer lobe membranous mostly, broad basally, tapering to the apex, outer margin slightly sclerotised (Fig. 5 C and Fig. 6 A). Epiproct heart-shaped; dorsal sclerite notched apically, median part forming a pair of sclerotised bands, with a thin and slightly sclerotised protrusion between the sclerotised bands, outer margins of sclerotised bands bearing spinules; ventral sclerite with a pair of slightly sclerotised bands, each band bearing many spines (Fig. 6 D-E and Fig. 7 A-C). Diagnosis The male of this species is characterised by the heart-shaped epiproct with a thin and slightly sclerotised structure projecting between the sclerotised bands. In I. tuberostyla (Wu 1962) and I. bituberculata sp. nov., the epiprocts are tumour-shaped and there are no structures projecting from the epiproct. Etymology This species is named after the type locality, Medog County. “Motuo” is the spelling of “Medog” in Chinese pinyin. Distribution China: Tibet.