Ommatidiotus koreanus Matsumura, 1915

(Figs 5A–B, 6A–E, 7A–F)

Ommatidiotus koreanus Matsumura, 1915: 176; Metcalf, 1958: 104.

Diagnostic characters. Recognized by body generally above whitish, below black. Coryphe about 2 1/2 times as long as between eyes, concave lengthwise, with a longitudinal crimson line in the middle not quite reaching the tip. Metope black. Clypeus whitish at base and sides. Antennae black, lighter at tip, whitish granular. with light brownish bristle. Pronotum about half as long as mesonotum, in middle with a longitudinal carmine-reddish line continuing the scutellum spines, elytra longer than abdomen. Subhyaline, whitish-yellow tinged, on costa black, corium with two yellowish longitudinal lines. Clavus on posterior margin reddish yellow. Legs black, tip of femur, tibiae (dark base) and tarsi whitish, claws dark brownish (Figs 6A–E) (Matsumura, 1915).

Redescription. Male. COLORATION: General coloration of body whitish gray. Ventral parts of body fuscous, contrast with background distinctly. Coryphe concolorous but slightly fuscous at anteriorly, with indistinct longitudinal dark stripes with reddish stripe strongly developed medially, contrasted unicolored, surpassing pronotum and reaching posterior margins of mesonotum and almost reaching posterior portions of forewing. Paranotal lobes fuscous. Forewings with narrow reddish stripes medially, with strong fuscous markings on margins of costal area reaching posterior margins, yellowish stripes weakly developed between cubital and median cells, not reaching posterior margins. Abdominal sternites concolorous, posterior margins light yellowish. Femur fuscous, apices light brown. Tibiae and tarsus concolorous with background but apices fuscous. Apices of leg spines black (Figs 6A–E). SURFACE AND VESTITURE: Head with several coarse setae, body and forewings with sparse setae, rough. STRUCTURE: Head. Coryphe elongated visibly, almost two times longer than width without carinae, anterior margins round, posterior slightly concave (Figs 6C–D). Metope ventrally convex in lateral view, lateral keels converging narrower to apical, median carinae visible (Fig. 6E). Thorax. Pronotum distinctly shorter than coryphe, without median carinae. Paradiscal fields of pronotum narrower behind eyes. Paranotal lobes of pronotum ovate, protruding ventrally. Posterior margin of pronotum concave. Mesonotum large, almost two times longer than pronotum, anterior margin convex, with lateral carinae reaching posterior margin (Figs 6C–D). Forewings elongated, surpassing posterior margin of abdomen (Figs 6A–B). Abdomen. In lateral view, almost flat; length of each tergites almost similar (Fig. 6B). Genitalia. Genital block in lateral view slightly wide basally, apical to posterior margins irregularly concaved (Fig. 7E). Aedeagus long and asymmetrical, complex endosome ovovate ventroapically (Fig. 7C). In dorsocaudal view, apical of complex shaped irregular star-like, upper three processes long, protruding upward, lower two processes protruding ventrally and left process curved to upward (Fig. 7D). In lateral view, a pair of ventral aedeagal hooks asymmetrical, left hook parallel with complex and slightly curved, right hook vertical with complex and slightly curved, widest at middle; a pair of subapical processes strongly developed at middle, not reaching posterior margins and branched at apical (Fig. 7C); genital style roundly widest at basal, pointed at apical and strongly curved; capitulum of style spinous (Fig. 7E); Anal tube in dorsal view, ovate and convex apically; anal column placed at middle and small, not reaching the posterior margin (Fig. 7F). See Matsumura (1915) for original description also.

Measurements (in mm). Male(n=1). Body length (including forewing): 5.93; body length (excluding forewing): 5.34; body width (including forewing): 1.66; head length: 1.73; head width (including eyes): 1.30; coryphe length: 1.38; coryphe width: 0.64; metope length: 1.93; metope width: 0.79; pronotum length: 0.43; pronotum width: 0.95; mesonotum length: 0.80; mesonotum width: 1.02; forewing length: 3.91.

Material examined. Holotype: 1♂, Mt. Kumgang, Joseon; late. X.1914, Yoichiro Ikuma leg. (SEHU).

Distribution. North Korea (Mt. Kumgang) (Matsumura, 1915).

Hosts. Unknown.

Ecology. In moist and swamp meadows, more often in flood plains of rivers. Mid-July to mid-August (Anufriev & Emeljanov, 1988).

Remarks. Matsumura (1915) indicated that the holotype specimen was female, but Liang and Suwa (1998) corrected this error.