Flavoperla triangulata, Liu & Yan & Li, 2019

Flavoperla triangulata View in CoL sp. nov.

( Figs. 10–18 View FIGURE 10 View FIGURES 11–18 )

Adult habitus. General color yellowish brown ( Fig. 10 View FIGURE 10 ). Head mostly pale with a triangular brown marking between ocelli, and a smaller pale brown obscure area between frontoclypeus and M-line; compound eyes dark, ocelli with dark rings; antennae brown ( Figs. 10–11 View FIGURE 10 View FIGURES 11–18 ). Pronotum brown, rectangular except lateral areas paler, with pale brown rugosities and a pair of brown lines along anterior and posterior margins ( Fig. 11 View FIGURES 11–18 ). Wings hyaline, veins brown; legs pale.

Male. Body length 8.6–8.9 mm; forewing length 10.8–11.1 mm; hindwing length 9.6–9.8 mm. Hammer basal half brown with wing-shaped anterolateral extensions; apical half mostly unpigmented; subapex distinctly tapering and nipple-like covered by numerous brown spinules; apex slightly swollen and turned upward in lateral view ( Figs. 13–14 View FIGURES 11–18 ). Sternum 9 sclerotized except medial portion membranous with broadly rounded apical process. Epiproct sclerite brown and subtriangular, divided into two small subtriangles by a slender and membranous band; anterior margin set between bases of paired dark brown triangular spines ( Fig. 12 View FIGURES 11–18 ). Paraprocts short, curved forward with small apical hooks ( Fig. 12 View FIGURES 11–18 ). Dorsum aedeagus with a pair of short vertical sclerites medially ( Fig. 16 View FIGURES 11–18 ), ventrally gourd-shaped and gradually tapering to an obtuse triangular tip with two rounded processes in basolateral area ( Figs. 13, 15 View FIGURES 11–18 ), aedeagus curved upward in lateral view ( Fig. 17 View FIGURES 11–18 ), in caudal view with a small “fish mouth-shaped mark” ( Fig. 18 View FIGURES 11–18 ).

Female. Unknown.

Larva. Unknown.

Type material. Holotype male ( HIST), CHINA: Shaanxi, Qinling Mountain, Pinglianghe Forestry Station at Ningshan County, 18.7070 N, 108.8247 E, 2012. VII.13, light trap, Weihai Li GoogleMaps . Paratypes: 2 males, same data as holotype ( HIST) GoogleMaps .

Etymology. The specific name refers to the shape of marking on the head. “Tri” in Latin means three and “angulus” means an angle.

Distribution. China ( Shaanxi).

Remarks. See above.