Cheumatopsyche davisi Oláh & Johanson, 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 : 190-192

Cheumatopsyche davisi Oláh & Johanson , new species

Fig. 315–319

This species is closely to C. sagitta Kobayashi from Taiwan. Cheumatopsyche davisi , new species is easily distinguished by the presence of light pattern on the forewing membrane, not uniformly coloured membrane as in C. sagitta ; absence of a ventrocaudal, spiny lobe; and the harpagones are very slender along their lengths, not broad at their basis.

Male. Body brown with dense light pubescence, more densely on legs. Maxillary palp formula I-(III, IV)- II-V, segment V as long as sum of segments I–IV. Head dorsum dark brown, with 9 warts slightly lighter than head dorsum. Swollen setal wart absent on each proepisterna. Setal surface present on each precoxale. Pretarsal claws asymmetrical, laterally flanked by setal bundle. Mid- and hind-leg claws asymmetrical.

Wings. Forewing ( Fig. 315) membrane evenly brown with slightly darker veins and light patch pattern of various size and shape. Forewing crossveins m-cu and cu meeting in oblique line. Cu2 and A1 running separately before costa. Hind wing Sc and R meeting at crossveins. Crossvein r located anteriorly of crossvein s. Fork 1 absent. Forewing length 5.5 mm.

Male genitalia ( Fig. 316–319). Abdominal segment IX fused annularly, tergum half as long as sternum ( Fig. 316). Anterior margins of segment IX regularly bow-shaped in lateral aspect ( Fig. 316). Apical lobe on posterolateral margins blunt, right-angled, located above less sclerotized articulation cavity of gonocoxite ( Fig. 316). Spine row on posterior margin of segment IX intermittent and heterogeneous. Spines on dorsolateral spiny lobes 2 times longer than spines on apical lobes; dorsolateral, spiny lobes protruding triangularly in dorsal view ( Fig. 317). Intersegmental step between segments IX and X absent. Segment X medium sized, long, quadrangular in lateral view ( Fig. 316); small corner on dorsum present at two-thirds the length of segment X and at double rimed distal margin of mesocaudal, smooth plate; clearly bilobed in dorsal aspect ( Fig. 317); broadening apically due to broad, reniform, apicoventral setose lobes. Dorsal interlobular gap small, nearly circular; apicoventral lobes large. Sutures on both sides well developed, transverse, crossing segment X obliquely; orienting towards dorsal corners ( Fig. 316). Longitudinal sutures on each side broad, forming con- tinuation of apicoventral setose lobes; meeting transverse suture into Y. Smooth mesocaudal plate reduced, ending in straight rim; slightly curving dorsad, forming double rim in lateral view ( Fig. 316). Apicoventral setose lobes long, curving dorsad, narrowing apically in lateral view. Setae present on distal margin and in small group dorsally before apex ( Fig. 316); in dorsal view broad, with almost reniform, laterally broadening apex ( Fig. 317). Lateral setose areas (superior or preanal appendages) forming small, elevated, elongated warts located centrally before marginal part of segment X. Coxopodites reaching apex of segment X; forming straight rod in lateral view ( Fig. 316); dilating gradually towards apex; curving mesad at apex in ventral view ( Fig. 318). Harpagones slender, almost filiform, straight except turning slightly dorsad at apex ( Fig. 316). Phallotheca with long, broadening, curving ventrad at basis, with horizontal section; dorsum straight from half-length, ventrum concave along its length. Apex of phallotheca slightly broadening ventrad in lateral view ( Fig. 319). Endophallus long, running through entire phallotheca; ending in narrow tube at gonopore. Chitinized, endothecal process ovoid. Phallotremal sclerites rounded in lateral view. Few vestigial, membranous, ventral endothecal lobes clearly visible, even when covered with densely packed, small, hyaline spicules.

Holotype male: TAIWAN: Kao Hsiung Co., 10–11 km NE Chiashien, forest, 300 m, 3–8.vi.1980 [D. R. Davis] - ( NMNH).

Paratypes: TAIWAN: Kao Hsiung Co., 10–11 km NE Chiashien, forest, 300 m, 3–8.vi.1980 [D. R. Davis] - 22 females ( NMNH), 1 male, 1 female ( OPC); Tai Nan Co. 350 m, 2–3 km S Kwantzuling, bamboo shrub, 26–28.vi.1980 [D. R. Davis] - 4 males, 26 females ( NMNH) .

Distribution. Taiwan.

Etymology. davisi , named after the collector of the specimen, D. R. Davis.