Thagria triangula Fan & Li sp. nov.

(Figs. 224–248)

Description. Body length of male 6.1–7.0 mm, female 8.0–8.5 mm.

Slender, medium-sized species (Figs. 224, 234). General color brown, suffused with yellow spots on crown, pronotum, mesonotum and forewing (Figs. 224, 234). Crown with midline yellow (male) or apical 1/3 yellow (female); ocelli and eyes brown (Figs. 226, 236). Face dark brown, with clypeus with one yellowish brown Ushaped band (male) or deep V-shaped band (female), and scattered with (female) or without (male) yellow spots (Figs. 227, 237).

Head with anterior margin sharply angulate, crown wider than eye width, distally portion beyond eyes about 1/ 2 of midline, coronal suture evident, about 2/3 of entire median length, disk depressed (Figs. 226, 236). Face with clypeus long, lateral margins slightly convex; clypellus short, inflated longitudinally and medially, base broad, as wide as clypeus at juncture of clypeal suture, apical half constricted, apex nearly truncate (Figs. 227, 237). Crown, pronotum and mesonotum midline ratio about 1.3:1:1.5 (male) or 1.6:1:1.5 (female) (Figs. 226, 236). Forewing long, apex rounded, appendix narrowed (Figs. 224, 225, 234, 235).

Male genitalia. Pygofer lobe in lateral view tapered apically, caudodorsal margin with pair of long slender processes (Fig. 228). Ventral processes of segment X short, with small spine subapically (Figs. 228, 229). Subgenital plate long, segmented subbasally, with fine long setae distally (Fig. 230). Dorsal connective broadly Ushaped, stem absent, rami long, attached to base of ventral processes of segment X (Fig. 229). Aedeagus base broad, gradually narrowed toward apex, in lateral view slightly curved dorsad (Figs. 231, 232); paraphysis in dorsal view symmetrical, middle third broader than both ends, apex subtruncate with two very small spines laterally, apical half curved ventrally in lateral view, middle 2/3 with paired triangular processes laterally, edges serrated (Figs. 231, 232). Style slender, longer than paraphysis, biramose near middle, inner branch with small teeth, opposite glabrous (Figs. 231, 233).

Female genitalia. Ovipositor (Figs. 238–248) as in T. decussata Fan & Dai, sp. nov., except sternite VII apparently wider than length, ratio about 2:1, posterior margin convex with shallow concavity medially in ventral view (Fig. 238); valvifer I in lateral view, longer than width, posterodorsal margin without lobe (Fig. 240); valvifer II length-width ratio 3.6:1 (Fig. 241); valvulae II each with 14 or 16 teeth on apical fourth, and with one shared tooth on base of two separate blades (Fig. 246).

Type materal. Holotype: ♂, CHINA: Guangxi, Shiwandashan, 4 May 2012, coll. Yang Nannan (GUGC). Paratypes: 1♂ 1♀, CHINA: Zhejiang, Tianmushan, 20 July 2009, coll. Meng Zehong & Chen Yong (GUGC).

Etymology. The new species name is derived from Lain word “ triangula ” meaning triangular, referring to the two triangular processes on the middle 2/3 of the paraphysis.

Remarks. This species strongly resembles T. projecta (Distant, 1908) in external morphology and male genitalia, but the paraphysis has a pair of processes on the middle 2/3 (Fig. 231), which are absent in T. projecta (Fig. 221).