Stirellus translucidus sp. nov.

(Figs. 25–26)

Length. Male: 3.9–4.0mm; female: 4.3–5.0mm.

Color. General color sordid white (Fig. 25). Sometimes vertex and pronotum light tannish with orange-red hue (Fig. 25 C). Forewing translucent (Fig. 25 A–C).

Body. Long and narrow (Fig. 25 A–D). Head narrower than pronotum, anterior margin rounded to face, acutely angled. Vertex nearly as long as width between eyes (Fig. 25 A–C). Ocellus next to eye on anterior margin (Fig. 25 D). Eye relatively large (Fig. 25 A–C). Anteclypeus nearly parallel-sided, extending beyond normal curve of genae (Fig. 25 E–F). Pronotum median length slightly longer than median length of crown. Mesonotum and scutellum shorter than pronotum (Fig. 25 A–C). Forewing macropterous, usually exposing apex of abdomen in female (Fig. 25 A–D).

Male. Pygofer side with few macrosetae dorsally, apex truncate (Fig. 26 A–B). Subgenital plate slightly concave laterally, macrosetae uniseriate laterally (Fig. 26 D). Style narrow, apophysis slender, digitate, laterally curved (Fig. 26 E–F). Connective stem shorter than arms (Fig. 26 G). Aedeagal shaft bent at base, cylindrical, short, broad in lateral view, nearly parallel to aedeagal base (Fig. 26 H–J).

Female. Hind margin of seventh sternum nearly straight (Fig. 25 G).

Material examined. Holotype: Ƌ, China, Yunnan Prov., Menglun, 19 May 1991, coll. Wang Yinglun & Tian Rungang . Paratypes: China, Yunnan Prov.: 1Ƌ, Mengla County, Yaoqu, 600m, 7 June 1991, coll. Liu Guanchun & Cai Wanzhi ; 1♀, Menglun, 570m, 7 November 1999, coll. I. Dworakowska ; 1Ƌ, Xishuangbanna Menglun Town, 600m, 7 June 1991, coll. Liu Guanchun & Cai Wanzhi ; 3Ƌ, 1♀, Jingping County, Mengla Town, 450m, 1 May 2013, coll. Xue Qingquan ; 2Ƌ, Honghe, Zhemi, 5 May 2013, coll. Xue Qingquan ; 1Ƌ, 3♀, Luchun, Banpo Town, 10 May 2013, coll. Xue Qingquan ; 1Ƌ, 1♀, Mengla County, 14 May 2013, coll. Xue Qingquan; 1Ƌ, 3♀, Mengla County, Yaoqu, 23 May 2013, coll. Xue Qingquan .

Remarks. This species can be distinguished from other species of Stirellus by the following combination of characters: forewing translucent; body long and narrow (Fig. 25 A–D); apex of male pygofer side truncate (Fig. 26 A–B); shaft relatively broad in lateral view (Fig. 26 H–J). The aedeagus of this species is similar to that of some species of tribe Chiasmini, but it lacks a hinge near the base of the shaft and the structure of the male pygofer, which slopes caudoventrally, lacks a basolateral membranous cleft, and has a distinct lateral tooth and few macrosetae, indicate that the species is more appropriately placed in Stirellus .

Etymology. This specific epithet is based on the translucent forewing.