Dianica rugulosa Zhang sp. nov. (Figs 1–14)

Coloration. Light to dark brown without definite markings (Figs 1–2, 4). Crown and face brown, eyes dark brown and ocelli reddish brown (Fig. 3). Pronotum (Figs 1, 3) anterior margin light brown, lateral and posterior margins dark brown. Scutellum (Fig. 3) dark brown with basal triangles brown. Forewings (Figs 1–2, 5) brown except clavus dark brown, with paler venation.

Male basal abdominal apodemes (Fig. 6), strut-like, dorsal basal abdominal apodemes short and attaining posterior margin of sternite III, ventral ones poorly developed.

Male genitalia. Pygofer (Fig. 7) trapezoidal without setae; in lateral view, dorsal margin short, nearly straight; ventral margin long, slightly convex, apex distinctly upturned, caudal margin concave. Anal collar (Figs 7–8) process with apex foot-like directed caudally. Male valve broader basally than at apex. Subgenital plate (Fig. 7) gradually narrowed to tapered apex, without marginal and surface setae. Style (Fig. 9) with apophysis smooth, subapically expanded and then narrowed to pointed apex directed dorsally (Fig. 10), lacking setae. Connective (Figs 11–12) laminate, stem distinctly longer than combined width of arms. Aedeagus (Figs 13–14) stout, broad basally then abruptly narrowed to finger-like apex, without preatrium and dorsal apodeme; aedeagal shaft compressed laterally, ventral margin with a longitudinal carination, apex with pair of compressed keel-shaped processes; gonopore situated apically on ventral margin.

Female. Unknown.

Measurements (mm). Male: body length 7.05, face length 1.85, width 2.25; distance between ocelli 0.73; distance from ocellus to eyes 0.35; medial length of pronotum 0.75, width 1.75; scutellum length 1.18, width 1.38; length of anteclypeus 0.53, width across base 0.26, width across subapex 0.38.

Material examined. Holotype: male, CHINA: Yunnan Province, Yingjiang City, Xima town, 29.v.2011, Bin Zhang.

Host plant. Unknown.

Distribution. China (Yunnan).

Remarks. This species differs from other species of the Tasnimocerus group as follows: body size larger, colour brown to chocolate brown without dark markings, pygofer without dorsal anterior apodemes and ventral process, and lacking setae; aedeagal shaft slightly compressed laterally and without dorsal apodeme and preatrium.

Etymology. The specific epithet refers to the transverse rugae on the head and thorax.