Hydropsyche tritiyaha 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 : 119-121

Hydropsyche tritiyaha Oláh & Barnard , new species

Fig. 198–202

This species is similar to H. trimonticola Mey from Vietnam. It is easily distinguished by having a narrow, and not broad, median keel on segment IX; longer, apicoventral setose processes on segment X; coxopodites exceeding segment X; and both harpagones with stepwise distad narrowing in ventral view. This is a dark animal, not yellow as H. trimonticola .

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

Wings. Venation typical for the genus. Forewing crossveins m-cu and cu separate. Sc and R meeting immediately before costa. Cu2 and A separate. 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 6.9 mm, hind wing length 5.2 mm.

Male genitalia. Abdominal segment IX fused annularly, moderately long. Median keel narrow, parallelsided, rounded apically ( Fig. 199); dorsal surface granulose; lateral surfaces flat; Anterior margins of segment IX arciform; ventrum short; dorsum slightly longer than ventrum ( Fig. 198). Antecosta well developed, forming double line narrowing dorsad before margin ( Fig. 198). External groove of antecostal suture present. Apical lobe on posterolateral margins acutely triangular ( Fig. 198). Posterior spine row continuous, absent on dorsum. Depression between segments IX and X short, deep. Body of segment X short, triangular in lateral view ( Fig. 198); quadrangular in dorsal view ( Fig. 199). Lateral setose areas (preanal appendages) located distally, forming compact, pale patch and more scattered distal setae. Apicoventral setose lobes modified into pair of long protuberances with apical setae, strongly directing mesad, meeting mesally in dorsal view ( Fig. 199). Dorsal interlobular gap almost triangular; encircled by apicoventral setose lobes ( Fig. 199). Apicodorsal setose lobes fusing into setose ridge, or crest, shifted anterad to intersegmental depression. Smooth cavity on segment X forming large, shallow depression, dominating segment X; short, wide, darkly pigmented, transverse suture running ventrally from bottom of intersegmental depression on each side ( Fig. 198), crossing segment X obliquely in dorsal view ( Fig. 199). Each longitudinal suture on lateral sides encircling shallow cavity ventrally. Coxopodites exceeding segment X ( Fig. 198); proximal part of dorsal margin slightly sinuous; appendages slightly dilating distad from mid-length; nearly straight in ventral view ( Fig. 200). Harpagones curving dorsad in lateral view ( Fig. 198), parallel sided and stepwise broadening basomesally in ventral view ( Fig. 200). Phallic apparatus simply bent, very flat; shortened, ventrad curving basal part; distally broadening. Phallotheca with almost straight dorsal margin, except small dorsal concavity immediately before apex ( Fig. 201). Endophallus attached to dorsal wall of phallotheca, reaching bend of phallic apparatus, almost filling phallotheca. Phallotremal sclerites well separated into pair of slender, claw-like processes ( Fig. 201, 202); falciform in lateral; pincer-shaped in ventral view. Pair of sclerous, endothecal processes present from side of phallotremal sclerites ( Fig. 202); very thin, slender digitiform; almost in parallel with axis of phallotheca in lateral view. Sclerotized ventral process of phallotheca slightly shorter than phallotremal sclerites, similarly monolobed without central excision in ventral view.

Holotype male: INDIA: Chera Punji Khasias 189. Nat. [Doncaster] (McLachlan Coll. B.M. 1938-674) (in alcohol).

Paratypes: same data as holotype — 1 male ; Khasia Hills, McLachlan Coll (B.M. 1938-674) — 2 males.

Distribution. Northern India.

Etymology. tritiyaha , named after the sequence of its discovery, this species was the third known species in the Hydropsyche pluvialis species group in North India.