Cheumatopsyche kysonia Oláh & Johanson, 2008

Oláh, János, Johanson, Kjell Arne & Barnard, Peter C., 2008, Revision of the Oriental and Afrotropical species of Cheumatopsyche Wallengren (Hydropsychidae, Trichoptera), Zootaxa 1738, pp. 1-171 : 136-138

Cheumatopsyche kysonia Oláh & Johanson , new species

Fig. 325–329

This species is very similar to C. songbua , but in C. kysonia the pale, indistinct forewing spots are restricted to the radial area; the apical lobes of segment IX are triangular not rounded; the coxopodites are weakly dilating apically; the ventrocaudal spiny lobe is slightly longer and broader, with more spines; and the phallic endothecal process is longer and more oval.

Male. Body and wings brown with brown pubescence; both forewings with pale spots in radial area. Maxillary palp segment I shortest, segment II longer, segments III and IV equally long, segment V as long as sum of segments I–IV. Head dorsum brown with 7 lighter coloured warts. Proepisternum without swollen setal wart. Protarsal claws asymmetrical, laterally flanked by setal bundle. Forewing length 7.0 mm, hind wing length 5.1 mm. Hind wing fork I absent.

Male genitalia. Segment IX fused annularly; sternum about 2x longer than tergum ( Fig. 325), sternum produced into rectangular ventrocaudal spiny lobe ( Fig. 326) bearing 10–12 stout, stiff spines; anterior margins of segment IX uniformly convex; apical lobe on posterolateral margins triangular, located at mid-height of segment IX, bordering wide articulation cavity of coxopodites; spine row on posterior margins of segment IX incomplete, with pair of 3 spines at dorsocaudal spiny lobe being longer and stiffer than on apical lobes. Intersegmental step between segment IX and segment X deep, occupied by vertical margin of segment X. Segment X short, nearly triangular; sharply tapering apically ( Fig. 325) by pointed setaless mesocaudal lobe; setaless mesocaudal lobe rounded triangular in dorsal view ( Fig. 327). Apicoventral setal lobes completely fusing with segment X, delineated by setae, visible as setose processes in dorsal view ( Fig. 327). Lateral setose areas forming pair of spherical warts located centrally on segment X, clearly visible in dorsal and lateral view ( Fig. 325, 327); apices exceeding lateral margins of segment X in dorsal view ( Fig. 327). Dorsal and lateral interlobular gaps absent. Transverse sutures running obliquely ( Fig. 325, 327), dividing segment X into basal, less sclerotised sections, and distal, more strongly sclerotised sections. Pronounced and sclerotised longitudinal sutures present dorsally and parallel with ventral margin of segment X, forming continuation of apicoventral setal lobes ( Fig. 325). Coxopodites exceeding apex of segment X; straight, slightly dilating distad in lateral and dorsal view ( Fig. 325, 328). Harpagones forming laterally flattened, narrowly triangular plates

( Fig. 325), ventral margins convex, dorsal margins nearly straight, clearly sagittally flattening in ventral view ( Fig. 328), both armed with two stout apical setae. Phallotheca ( Fig. 329) slender, narrowing distad to midlength before widening distally; sclerotised endothecal process long, ovoid; phallotremal sclerites broad; vestigial ventral endothecal membranous lobe clearly visible.

Holotype male: VIETNAM: Ha Son Binh Province: Hoa Binh, 12 km to Dabac , 30.i.1986, light [J. Oláh] ( OPC, in alcohol).

Paratype: VIETNAM: Thanh Hoa Province, Cuc Phuong National Park , 400 m, 17.x.1986, light [J. Oláh] — 1 male ( OPC, in alcohol) .

Distribution: Vietnam (Thanh Hoa & Ha Son Binh Provinces).

Etymology: after the small town “Ky Son” at the Song Da River, the collecting location of the holotype.

Remark. The pale, indistinct spots in both forewings radial area disappear quickly in alcohol, but are well visible in dry material and fresh alcohol material.