Diomma ochracea Motschulsky, 1863.

Body yellow or brownish yellow, more or less flattened. Head almost equally broad as pronotum. Crown anterior margin produced medially. Pronotum with width greater than length. Vertex and pronotum usually ornamented with dark spots or stripes. Scutellum small, triangular; transverse impression distinct. Forewing apical veins free or 3rd apical cell stalked; 4th apical cell smallest. Hind venation reduced, submarginal vein poorly developed.

Abdominal apodemes long and narrow.

Pygofer large and broad, with numeous long setae at caudal margin and baso-ventral angle respectively. Subgenital plate extending beyond pygofer, with several microsetae on dorsal margin and with few of long macrosetae on outer surface. Pygofer dorsal appendage with distinct basal suture, but not movably articulated or immovably fused to margin, without basal suture. Central part of style very thick; preapical lobe prominant, sensory pits situated at preapical portion. Aedeagal shaft curved ventrally, usually with a obvious big process between preatrium and base of shaft. Gonopore terminal or subapical. Connective V- or Y-shaped; two lateral arms very long; central lobe absent or vestigial.

Afrotropical region, Australian region, Oriental region.

Head (Fig. 1) width about equal in length to greast width of pronotum. Vertex (Fig. 1) yellow, with a large median apical spot, orange red and with four irregular spots: one pair near posterior margin of crown light brown; other pair smaller, blackish brwon. Eyes (Figs 1, 2) greyish black. Face (Fig. 2) brownish black, with a orange red spot at its upper part. Anteclypeus quite large and broad, little expanded, nearly pentagonal. Pronotum (Fig. 1) with large irregular nut-brown stripes. Scutellum (Fig. 1) small, triangular; basal triangles blackish brown, a longitudinal dark stripe extended from base to apex. Forewing wax field orange yellow, with several irregular markings as in Fig. 3.

Abdominal apodemes (Fig. 4) extended to posterior margin of 4th sternite.

Pygofer lobe (Fig. 5) broad, with few of long macrosetae on lateral surface. Pygofer dorsal appendage immovably fused to margin, its terminal part bifurcate. Subgenital plate (Fig. 6) long, much protruding beyond pygofer lobe, with four basal macrosetae and numerous short rigid setae along upper margin. Style (Fig. 7) broad in middle, long and slender at apical portion, with four sensory pits not far from preapical lobe. Preapical lobe small, but prominent. Aedeagal shaft (Figs 8, 9) curved ventrally, with serrated lateral margin in median; shaft elongated. Preatrium with a large process, its length about as long as that of dorsal apodeme. Gonopore subapical, ventrad. Connective (Fig. 10) Y-shaped, two lateral arms very long, which more than two times of connective stem length; central lobe small, quite vestigial.

Body length males 2.8 mm.

Holotype, male, China: Guizhou Province, Qianxi County, 15~17 October 2007, coll. QIONG-ZHANG SONG. Paratype: one male, same date as holotype.

The new species can be distinguished from other species of the genus by its unique aedeagus’s structure (Figs 8, 9).

The specific name is derived from the Latin word “pincersa” (claw, clamp), which refers to the pygofer dorsal appendage with terminal part branched or bifurcate (Fig. 5).

six males, six females, China: Yunnan Province, Mengla County, 18 July 2008, coll. Yuehua Song; one female, China: Yunnan Province, Menghai County, 24 July 2008, coll. Yuehua Song.

Sunda; China (Yunnan).