(Figs 16, 25p)
Body orange-brown. Head with pair of brown semilunar patches at transition to face. Posterior margin of crown with brown streak medially. Face light yellowish, anteclypeus and frontoclypeal area orange-brown. Eyes blackish. Pronotum orange-brown, with two whitish elliptic patches medially. Basal triangles of mesonotum blackish. Fore wing brown.
Male genitalia: Pygofer with 1–2 macroseta(e) at cephalo-ventral angle of lobe (Fig. 16a), apex of dorsal appendage pointed (Fig. 16b). Subgenital plate with 5 macrosetae (Fig. 16a). Style with apical tooth much longer than subapical tooth (Figs 16c, d). Aedeagal shaft short, with pair of sphenoid processes just below gonopore, apical processes long, hook-like in ventral view; preatrial process short, apex pointed in ventral view; gonopore central (Figs 16f, g).
Measurement: Male 3.05mm, female 3.15mm.
Material examined: Holotype: ♂ [NWAFU], CHINA: Yunnan Prov., Jinghong City, 750m, 5.xii.1999, coll. I. Dworakowska. Paratypes: CHINA, Yunnan Prov.: 1♀ [NWAFU], Jinghong, 600m, 25.xii.1999, coll. Qin Daozheng; 2♂♂ 3♀♀, Menglun, 700m, 11.xii.1999, coll. I. Dworakowska; 2♂♂ 1♀ [NWAFU], Menglun, 600m, 11.xii.1999, coll. I. Dworakowska? 1♀ [NWAFU], Menglun, 570m, 11.xii.1999, coll. I. Dworakowska; 1♂ [NWAFU], Menglong, 24.xii.1999, coll. Qin Daozheng.
Remarks: This new species is similar to A. arcuata sp. nov. but the aedeagal shaft is shorter and thinner, with a pair of sphenoid processes just below the gonopore, and the preatrial process is shorter.
Etymology: The specific epithet is derived from the Greek word “ sphenos ”, referring to the aedeagal shaft having a pair of sphenoid processes.