Hydropsyche chengdu 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 : 131-133

Hydropsyche chengdu Oláh & Barnard , new species

Fig. 216–220

This species is similar to H. columnata Martynov from China (Sichuan), especially in the shape of segments IX and X; as well as in basic structures of the phallic apparatus. In H. chengdu , new species, the apex of the apicoventral setose processes is shorter, with narrowing and ventrad curving apex, not long as in H. columnata . The harpagones dilate apicad, with bifid configuration, not narrowing; the apicoventral bilobed apex of both setose lobes are located far from each other in dorsal view; and the median keel in H. chengda is extremely wide.

Male. Body and wings brown with lighter pubescence. Forewing membrane light brown without pattern. Sternite V with low protuberance. Maxillary palp formula I-(III, IV)-II-V, segment V shorter than sum of segments I–IV. Head dorsum brown, with 9 brown setal warts; anteromesal setal wart difficult to discern. Swollen setal wart present on proepisternum. Pretarsal claws asymmetrical, laterally flanked by setal bundle. Spur formula 244. Protibiae with posteroapical spur smaller than anteroapical spur. Venation typical for the genus, except hind wing median cell open. Forewing crossveins m-cu and cu separate. 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 close. Median cell open. Fork 1 present. Forewing length 8.0 mm, hind wing length 6.0 mm.

Male genitalia. Abdominal segment IX fused annularly, laterally short without apical lobe ( Fig. 216). Median keel short, extremely broad ( Fig. 217); as wide as segment X; granulose at dorsal and lateral surfaces; widely and shallowly excising apicad in dorsal view ( Fig. 217); anterior margin shallowly arciform, more deep ventrally; ventrum and dorsum short ( Fig. 216). Antecosta well developed, wide before margin. External groove of antecostal suture present. Apical lobe on posterolateral margins robust, broad, nearly triangular ( Fig. 216). Posterior spine row intermittent, present on keel slope and on apical lobes, absent between. Depression between segments IX and X shallow, stepwise. Body of segment X broadly rounded, quadrangular ( Fig. 216, 217); dorsal margin, ventral margin long. Lateral setose areas (preanal appendages) located ventrally on segment X ( Fig. 216), forming compact, ovoid, surfaces of paler background and setae in diffuse, scattered groups distally to apical margin of segment X. Digitiform, apicoventral setose lobes short, robust, straight, directed obliquely; slightly narrowing and distally curving ventrad; each with apex truncate in dorsal view ( Fig. 217). Dorsal interlobular gap long, narrow, as demarcated by apicoventral lobes ( Fig. 217); bottom slightly excised at middle. Apicodorsal setose lobes located at middle of dorsum, forming triangular hump dorsally of median keel in lateral view ( Fig. 216), forming widely separated pair of setose surfaces in dorsal view ( Fig. 217). Smooth cavity demarcated by longitudinal sutures. Short, narrow transverse sutures running ventrad from bottom of intersegmental depression on each side. Coxopodites not exceeding segment X; robust, dorsal margin slightly sigmoid; weakly curving mesad in ventral view ( Fig. 218). Harpagones dilating distally ( Fig. 216), in ventral view with slightly produced corners ( Fig. 218). Phallic apparatus sinuate ( Fig. 219), forming tube of almost same diameter along its length; heavily pigmented, exposed; phallotremal sclerites deiform in lateral view ( Fig. 219), nearly heart-shaped in ventral or dorsal view ( Fig. 220). Tube narrowing at phallotremal sclerites; strongly constricted in ventral view followed by sclerotized, ventral phallothecal lobe; ventral lobe widening strongly after constriction, bilobed. Lobes nested, with holes filled with eversible membranous endothecal processes armed with apical cluster of 4–5 short, stout spines immersed in eversible pockets; dorsolateral membranous endothecal processes originate posteriorly of phallotremal sclerites, very thin, hardly visible; directed straight anterad, each with short, stout, apical spine.

Holotype male: CHINA: Sichuan, Chengtu , 14.ix.1940 [Phs. Richardson 1679collecting number?] - ( NHML, in alcohol).

Paratypes: 1 male: same as holotype.

Distribution. China (Sichuan)

Etymology. chengdu , derived from the type locality, Chengtu.