Dayus elongatus Mahmood, 1967 by original designation.

Vertex (Fig. 1) slightly longer medially than next to eye. Forewing (Fig. 22) with 3^rd apical cell petiolate, cua cell broad distally; veins RP, MP’ and MP’’+CuA’ arise from m cell. Hindwing (Fig. 23) with apically broad m cell. Male pygofer (Figs 3, 13, 24) abruptly and strongly narrowing caudad; dorsal bridge about half length of pygofer (Figs 15, 26); with few rigid microsetae distally; elongate ventral appendage present, extended beyond pygofer. Subgenital plate (Figs 5, 17, 27) with basal group of macrosetae and one or two oblique rows of more distal macrosetae. Connective (Figs 7, 19, 29) completely fused with the base of aedeagus. Aedeagus (Figs 8, 20, 30) with basal apodeme absent; shaft strongly curved posteriorly at base with one or two pairs of processes.

Length, male 3.0 mm.

General color reddish to reddish brown. Both sides of coronal suture with a brownish patch.

Male ventral abdominal apodemes reaching segment 5 (Fig. 4). Male pygofer with dorsoposterior margin sinuate; pygofer appendage with dorsal margin sinuate in lateral view, tapering to apex (Fig. 3). Subgenital plate about twice as broad basally than distally, with three lateral macrosetae in basal group, an oblique line of 14 macrosetae and several long fine setae subbasally to apex and ca.12 short microsetae at outer margin (Fig. 5). Paramere as in Fig. 6. Aedeagus shaft long and narrow, slightly depressed dorsoventrally, similar in width throughout length in ventral view, with a pair of short bifurcate apical processes (Figs 7, 8). Anal tube process short (Fig. 9).

Holotype male. China: Zhejiang Province, Fengyang mountain, 30 July 2009, coll. Junqiang Ni.

The new species name alludes to the pair of apical bifurcate aedeagal processes.

The new species can be distinguished mainly by the shape of the aedeagal shaft and its process configuration as noted in the description.

Length, male 4.5–4.6 mm, female 4.7–4.8 mm.

General color yellowish.

Male ventral abdominal apodemes reaching segment 4 (Fig. 14). Male pygofer with dorsoposterior margin strongly sinuate (Fig. 13); ventral appendage expanded at distal 2/3, thereafter abruptly tapering to spine-like apex (Figs 13, 16). Subgential plate abruptly expanded laterobasally about twice as broad basally than distally; with 11 lateral macrosetae in basal group, an oblique line of 17 macrosetae and several long fine setae subbasally to apex and ca.35 short microsetae at outer margin (Fig. 17). Paramere as in Fig. 18. Aedeagus shaft very long and narrow, cylindrical, nearly straight in lateral view, with a subapical trifurcate process on each side, branches slender (Figs 19, 20). Anal tube process relatively long (Fig. 21).

Holotype male. China: Beipei, Chongqing, 6 May 2008, coll. Zaihua Yang. Paratypes, 13♂♂, 5♀♀, same data as holotype (GUGC and 1♂, 1♀ in BMNH).

The new speciesnamealludes to the trifurcate processes of the aedeagus.

Thenew species can be distinguished mainly by the strongly sinuate posterior margin of the pygofer and shape of the aedeagal shaft and configuration of its process as noted in the description.

Length, male 3.9mm.

General color yellowish.

Male ventral abdominal apodemes reaching segment 3 (Fig. 25). Male pygofer (Fig. 24) with dorsoposterior margin concave, tapering caudally; ventral appendage with dorsal margin slightly sinuate, tapered to acute apex. Subgenital plate slightly broader basally, with 9 apically rounded lateral macrosetae in basal group, an oblique line of 12 macrosetae and several long fine setae sub-basally to apex and ca.32 short microsetae at outer margin (Fig. 27). Parameres as in Fig. 28. Aedeagus shaft long, basal half strongly dorsoventrally depressed, distal half narrow and cylindrical, serrate laterally at base on dorsal surface; with two long processes arising at midlength on each side of shaft, basally each process with a lateral lamellate serrate lobe (Figs 29, 30). Anal tube process short (Fig. 24).

Holotype male. China: Hainan Province, Wuzhi mountain, 13 April 2009, coll. Zaihua Yang.

The new species name is derived from the serrationsat midlength of the aedeagal shaft and base of the aedeagal processes.

Thenew species can be distinguished mainly by the relatively rather uniform width of the subgenital plate and shape of the aedeagal shaft and configuration of its process as noted in the description.