Semachrysa Brooks 1983

Genus Semachrysa Brooks, 1983 Semachrysa Brooks, 1983: 6. Type species: Semachrysa minuta Brooks, 1983: 10. Original designation. Indochrysa Banks, 1938: 225. nomen nudum. Diagnosis. Body small to medium-sized. Body length 5.6–8.0 mm, forewing length 7.5–11.3 mm, hindwing length 6.7–9.6 mm. This genus is charactized by the presence of the head usually with black spots on lateral sides of the vertex and the gena, the frons with three pairs of black spots on lateral side and a dark spot at middle, the scape and pedicel usually with brown stripe on the outer side, the pointed terminal palpomere of maxillary and labial palpi, the mesonotum always with brown markings on prescutum and scutum, the pronotum and metanotum usually without markings, the legs with dense setae, the pretarsal claws with basal dilation, the forewing often with brown shadings on gradate series, CuP and posterior margin crossveins, the basally broad costal area, the indistinct pterostigma, the ovoid cell im, the gradates in two divergent rows, the basal crossvein of inner gradate series meeting Psm, the opened cell dcc, the male sternum VIII fused with sternum IX, the median arch of gonarcus usually with projections, the entoprocessus in different shapes and posteriorly with two pairs of long setae on associated membrane, the arcessus widest at middle or at base, the apically bilobed female subgenitale, the thick spermatheca, the extremely long or medium length female vela, the shallow or deep ventral impression, and the long coiled duct. Distribution. Oriental and Australian regions. Key to species of Semachrysa in China 1. Frons with dark spots; thorax marked spots................................................................. 2 No spots on frons; thorax without spots........................................................ Se. pura sp. nov. 2. Basal crossvein of outer gradate series of forewing with brown shadings.......................................... 3 Basal crossvein of outer gradate series of forewing without brown shadings....................................... 5 3. 4th posterior margin crossvein of forewing with large and dark brown shading; female vela and ventral impression long....................................................................................... Se. contorta 4th posterior margin crossvein of forewing without shadings; female vela short, ventral impression small............... 4 4. Distal half of male entoprocessus wide and basal half narrow, without processus....................... Se. matsumurae Male entoprocessus quadrate, with acute processus on upper right angle................................ Se. ploystricta 5. Mesoprescutum and mesoscutum all brown; median arch of male gonarcus narrow, arcessus not trifurcated.............. 6 Posterior margin of mesoprescutum and anterolateral angle of mesoscutum brown; median arch of male gonarcus broad; arcessus trifurcated, elongated at middle and shortened at lateral side.............................. Se. triloba sp. nov. 6. Male arcessus without setae................................................................. Se. guangxiensis Male arcessus with three setae.................................................................. Se. decorata