(Fig. 22–28)
Adult. Length of forewing 5.6–6.1 mm (N = 2). Head brown with dark yellowish antennae, pronotum dark yellow, meso- and metanota light brown, forewings light brown.
Male genitalia. Posterior margin of sternum IX with mesal trapezoidal excision and small median protrusion in ventral view. Terga IX + X short, sub-trapezoidal, 1/3rd as long as width in dorsal view. Preanal appendage sub-rectangular, narrowed at base in lateral view, 2 times as long as height of distal margin. Dorsobasal process of preanal appendage enlarged basally, recurved caudad at 1/3 distance from base, with recurved portion evenly turned upward in lateral view. Inferior appendage gradually narrowed at distal 1/3rd, with apex highly sclerotized and extending beyond tips of preanal appendage; ventromesal lobe of inferior appendage well developed, forming subapical process in lateral and ventral views; in ventral view, apex of inferior appendage acute, strongly curved mesad; apex of subapical ventromesal lobe of inferior appendage slightly narrowed before blunt apex. Subphallic sclerite trough-like in caudal view (Fig. 27), apex deeply excised in “V” shape and with mesal oval excision in ventral view. Phallus simple tube, about 4 times as long as average width.
Holotype: male, Zhejiang Province, Mt. Tian-mu. 30.4°N, 119.5°E, Xian-ren-ding, alt. 1500 m, 20 July 1998, Coll. ZHAO Ming-Shui. Paratype: 1 male, Zhejiang Province, Mt. Tian-mu, 30.4°N, 119.5°E, San-muping, alt. 780 m, 21 July 1999, Coll. ZHAO Ming-Shui.
Diagnosis. This new species is very similar to Polyplectropus rostriformis Zhong et al. 2006 from Anhui, in the general shape of the male genitalia. It differs from it in that: 1) apicolateral margin of each inferior appendage is broadly rounded (the outer apical angle is in right angle in P. rostriformis); 2) the dorsobasal process of each preanal appendage is arc-shaped with apex straight (sinuate in P. rostriformis with hooked apex); and 3) the apex of the subphallic sclerite is deeply excised in a “V” shape with a mesal oval excision (deeply excised in a “V” shape with a mesal “V” shape excision in P. rostriformis).
Etymology. The species name derives from “Tian-mu-shan,” the type locality of this new species. Distribution. China (Zhejiang).