Holotype male (HNHM, right fore leg lost, abdomen with genitalia in a plastic microvial with glycerol): THAILAND: 8 km E of Doi Anh Kang, over a rocky brook, Nov 2, 2004, No. 17, leg. L. PAPP & M. FÖLDVÁRI. Its body length was measured before making genitalia preparation and b. l. is described on pin card under the specimen.

Measurements in mm: body length 6.60, wing length 3.64, wing breadth 1.63.

Head black but occiput so strongly microtomentose that looks grey. Antenna black, dorsal 1/5 of flagellomeres 7 and 8 whitish yellow, four apical (10th–14th) flagellomeres whitish yellow but lateral and medial sides of flagellomere 10 with diffuse brown spot subventrally. Tip of apical flagellomere also diffuse brown. Medial flagellomeres 5 times broader than long. Face linear at middle. Proboscis and palpi black, latters minute, hardly longer than 0.05 mm.

Scutum brown with a pair of transverse postalar yellow spots and 2 pairs of diffusely bordered ochre longitudinal bands: lateral ones from anterior parapsidal suture to scutellum, medial ones from antepronotum slightly posteriorly to the level of wing base, separated from each other by a sagittal brown line and from the lateral ones by a pair of thin brown oblique bands. Prosternum yellow, dorsal part dark brown, with some short black setae. Pleura dark brown but katepisternum dorsally with a broad light band. Laterotergite bare. Scutellum blackish brown. Subscutellar membranous area large in form of a triangle, which is slightly higher than its basal side.

Basic colour of wing light brown, all apex infuscated. Upper (costal) marginal parts to the level of Rs (i.e. also 2/3 of cell r5) dark brown with 2 quadratic “windows”: 1) from apex of Sc down to R4–5, 0.25–0.27 mm long, 2) distally to R4, down to middle of cell r5, 0.20–0.25 mm long. Costa continued to the 1/3 of R5-M1 costal section (0.195 mm), ends abruptly. Costal ratios: 0.87 mm: 0.12 mm: 0.77 mm, R4 0.205 mm. M1–2 stalk 0.43 mm, M1 1.87 mm. Knob of haltere black, stalk white.

Coxae black, for and mid femora dark brown, hind femur yellow with brown base and apical part. Fore tibia and all fore and mid tarsi yellow, mid tibia ochre, hind tibia and metatarsus dark brown, less thickened than in H. oroszi. Tibia spurs: 1 (light brown): 2: 2(white). Claws short thick with ventral comb-like dentation.

Basal abdominal sclerites dark brown, tergites 2–6 yellow with brown lateral and caudal margins, which are gradually larger on more caudal segments. Sternite 2 with broad brown lateral rim, cranial part with a 6-gonal brown spot to its 2/5; sternite 3 with brown lateral rim in its caudal ľ and with a diffuse brown spot centrally; both S4 and S5 yellow in their cranial 1/3, brown posteriorly with a pair of quadrate yellow spots. Tergite without a pair of laterocaudal processes (as in H. oroszi). Cerci perpendicular to the tergite 9 (Fig. 28) and so not reliably depicted in a single view. Caudal lateral process of tergite 9 rather long (Fig. 28). Medial incision of gonocoxite (Fig. 26) medium long and narrow, medial caudal pair of gonocoxal processes broad apically and with a row of short sharp black thornlike setae. Basal lobe of gonostylus (Fig. 27) large, broad, gonostylus much narrowing in lateral view. No long setae on basal process but medial surface with numerous short black setae; lateral lobe covered with medium-long setae only.

This species keys to H. septentrionalis OKADA (Japan) in MATILE’ s (1990) key. Also its wing pattern resembles to that of H. septentrionalis. However, male genitalia are strongly different: shape and armature of gonocoxite and particularly gonostylus are very different (Figs 26–27, cf. figs 587–8 of MATILE 1990).

Keroplatus sp. 1 f: PF04/11. This is also a new species. However, since it is a female, it is advisable to wait until male material is available.