Hydropsyche gyantsana Oláh & Barnard, 2008

Oláh, J. & Johanson, K. A., 2008, Generic review of Hydropsychinae, with description of Schmidopsyche, new genus, 3 new genus clusters, 8 new species groups, 4 new species clades, 12 new species clusters and 62 new species from the Oriental and Afrotropical regions (Trichoptera: Hydropsychidae), Zootaxa 1802, pp. 1-248 : 104-106

Hydropsyche gyantsana Oláh & Barnard , new species

Fig. 159–162

This species is similar to H. nepalarava , new species from Nepal. The holotype and a female of this new species were collected in copula, however the tip of the phallic apparatus is lost. The combination of characters on segments IX and X, as well as on the gonocoxites clearly differentiate this species from other species. The median keel on segment IX is short, almost parallel-sided and very broad, while sharply triangular in H. nepalarawa . The apicodorsal setose lobe is shallower and longer in lateral view, and the apicoventral setose lobes larger than in H. nepalarawa . Both harpagones are finger-like, not tapering as in H. nepalarawa . Moreover, the forewing membranes of H. gyantsana lack pattern, while those in H. nepalarawa are spotted.

Male. Body and wings dark brown. Forewing membrane uniformly brown, without pattern. Maxillary palp formula I-II-(III, IV)-V, segment V as long as segments I–IV together. Dorsum of head dark brown, with 9 dark brown setal warts. Swollen setal wart present on proepisternum. Pretarsal claws asymmetrical, laterally flanked by setal bundle. Spur formula 244. Protibiae both with posteroapical spur smaller than anteroapical spur.

Wings. Venation typical for the genus. Forewing crossveins m-cu and cu separate from each other. Sc and R, and Cu2 and A separate before costa. Hind wing Sc and R meeting before costa about at crossvein r. Stem of M and Cu1 running closely. Median cell closed. Fork 1 present. Forewing length 10.5 mm, hind wing length 8.2 mm.

Male genitalia. Abdominal segment IX fused annularly, moderately long. Median keel short, broad, almost parallel-sided in dorsal view ( Fig. 160); dorsal surface granulose; lateral surfaces flat; anterior margin arciform, with short ventrum and slightly longer dorsum ( Fig. 159). Antecosta on both sides well developed, each forming double line, narrowing dorsally before margin; with well visible external groove of antecostal suture. Apical lobe on posterolateral margins broad, nearly triangular ( Fig. 159). Posterior spine rows nearly continuous, with short space immediately above apical lobes, absent on dorsum. Depression between segments IX and X deep, V-shaped. Body of segment X rounded quadrangular in lateral and dorsal view ( Fig. 159, 160); slightly constricting basad in dorsal view ( Fig. 160). Lateral setose areas (preanal appendages) forming compact, pale, well delineated elliptical surface centrally on segment, and distally located, loosely packed group of setae. Apicoventral setose lobes modified into pair of short, slightly ventrad curving digitiform processes. Dorsal interlobular gap deep, wide. Apicodorsal setose lobes forming pair of nearly fused set- ose ridges or crests; long, dominating dorsum in lateral view ( Fig. 159). Smooth, shallow cavity on segment X ventrally encircled by lateral longitudinal sutures; short, wide, darkly pigmented transverse sutures running ventrally on each sides from bottom of intersegmental depression, visible in dorsal view as suture crossing centre of segment X ( Fig. 160). Longitudinal sutures running above Lateral setose areas and below glabrous cavity. Coxopodites exceeding apex of segment X; basal half with undulating dorsal margin ( Fig. 159); slightly dilating from mid-length; nearly straight in ventral vie ( Fig. 161). Harpagones curving mesad ( Fig. 161); parallel sided, except at narrowing slightly apically. Phallic apparatus bent smoothly ( Fig. 162); very flat due to shortened ventrad curving basal section; broadening along short, ventrad curving basal part. Phallotheca with straight dorsum.

Holotype male: TIBET: Gyantse , 13000 ft., 23.vii.1928, Lt. [F.M. Bailey] (B.M. 1928-409).

Paratype: same data as holotype (in copula) (genitalia injured) — 1 female .

Distribution. China (Tibet).

Etymology. gyantsana , named after the type locality.