Masaakia nema Thapa, 1989, by original designation.

Generic characteristics according to Thapa (1989), Song and Li (2009), and Cao et al. (2019).

Body yellow or white, with dorsal patterns usually in red, orange, or brown. Head with anterior margin medially produced, slightly narrower than pronotum, or subequal to or broader than pronotum. Known species of this genus with vertex bearing a pair of dark preapical spots and a pair of dark brown spots arising downward from posterior margin; these serve as taxonomic diagnostic characters. Coronal suture distinct or indistinct. Junction of vertex and pronotum dark-colored. Face broadened, with anteclypeus almost black or brownish black, nearly pentagonal. Eyes black. Pronotum broad, often with obvious dark patterns. Scutellum yellow or orange, with basal triangles and apex black; transverse impression distinct, with two small, rounded spots above it. Forewing with large, dark patterns in bright ochre-yellow or dirty-brown, with special venation for Erythroneurini, CuA′ fused with MP proximal to MP bifurcation, leading to petiolate shape of second apical cell; MP″+CuA′ curved basally; AA fused with AP. Hind wing with RA absent.

Abdominal apodemes not reaching or exceeding 3^rd sternite.

Male genitalia. Anal tube often with pair of basal processes, distal area near ventral side with good sclerotization. Pygofer with dorsal appendages, firmly fused to the pygofer lobe at basal margins. Pygofer lobe hind margin acutely produced, often with small group of microsetae around it; several long and rigid setae, or long and slender cilia, scattered on surface of pygofer lobe. Subgenital plate expanded at base, with 4 or 5 macrosetae on lateral surface, apex bending towards internal margin, dentiform, or rounded without curve. Style apex slender or with a second end point, preapical lobe small but prominent or broad and distinct. Aedeagal shaft tubular; preatrium length variable, with or without processes; dorsal apodeme swollen slightly. Connective with distinctly developed lateral arms, central lobe distinct or vestigial, stem short or absent.

Oriental and eastern Palaearctic Regions: China (Henan, Guizhou, Sichuan, Tibet), India (Sikkim), and Nepal (Kathmandu).

Body light brown. Vertex and pronotum light brownish yellow (Fig. 1A, D). Vertex anterior margin protruding medially, with 4 dark brown spots (Figs 1A, D, 2C). Coronal suture distinct, with dark brown patch along midline and vertex–pronotum junction. Face brownish yellow, with dark brown anteclypeus (Fig. 1B, E). Pronotum yellowish, with large, dark-brown to black markings. Scutellum yellow or orange (Figs 1A, D, 2C). Forewing brownish white, with numerous large brown or orangish-brown markings; brochosome brightly ochre-yellow; 1^st apical cell with oblique base, 2^nd apical cell petiolate basally, 4^th apical cell very small (Fig. 2K). Hind wing without RA (Fig. 2M).

Abdominal apodemes broad, extending to middle area of 5^th sternite (Fig. 2F).

Male genitalia. Pygofer (Fig. 2A) broad, with long, fine setae near caudo-ventral margin; lobe near tail tip almost transparent; dorsal pygofer appendage fused to lobe (Fig. 2D). Anal tube with pair of basal processes (Fig. 2B). Subgenital plate (Fig. 2E) with base twice as wide as apex, numerous stout setae from middle to tip, and five macrosetae at concave area subbasally. Style (Fig. 2J) slender, apically elongate. Aedeagal shaft (Fig. 2G−I) curved dorsally in lateral view, several short, fine setae located at base of shaft and separately near gonopore; preatrium as long as dorsal apodeme. Connective (Fig. 2L) with lateral arms long and central lobe large.

Body length in males 3.3–3.5 mm, in females 3.2–3.5 mm.

Holotype male: China, • Guizhou Prov. Maling River Canyon, 700–800 m, 25.1345°N, 104.9733°E, 26 Jan. 2025, coll. Wenming Xu (specimen no. MLH2X-1; deposited in the School of Karst Science, Guizhou Normal University, Guiyang, China [GZNU]). Paratypes: • one male, seven females, same data as holotype (specimen no. MLH2X-2, MLH2C-1−MLH2C-7; deposited as above).

The new species can be distinguished from other species by the following characteristics: aedeagal shaft without any processes (Fig. 2G−I); abdominal apodemes extending to 5^th sternite (Fig. 2F); subgenital plate with 5 macrosetae subbasally at concave aera (Fig. 2E); and style with pointed apex and a secondary dentate-like extension (Fig. 2J).

The specific name refers to its type locality from Maling River Canyon, Guizhou.