Revision of the family Metarbelidae (Lepidoptera) of the Oriental Region. I. Introduction and genera Encaumaptera Hampson 1893, Orgyarbela gen. nov., and Hollowarbela gen. nov. Author Yakovlev, Roman V. Altai State University, pr. Lenina 61, Barnaul, 656049, Russia. E-mail: yakovlev _ asu @ mail. ru & Tomsk State University, Laboratory of Biodiversity and Ecology, Lenina pr. 36, 634050 Tomsk, Russia Author Zolotuhin, Vadim V. Ulyanovsk State Pedagogical University, pl. 100 - letia Lenina 4, RUS- 432700, Ulyanovsk, Russia. E-Mail: v. zolot @ mail. ru text Ecologica Montenegrina 2020 2020-12-07 38 84 101 http://dx.doi.org/10.37828/em.2020.38.11 journal article 10.37828/em.2020.38.11 2336-9744 13232753 urn:lsid:zoobank.org:pub:D378D47B-66B4-4DC0-9F52-C27614E0E523 Orgyarbela kerri sp. nov. Figs 15 , 24 Material . Holotype : male, Laos , Nam Guak [Yuak river Valley, Wiengchau], 300 m , 25.iv.1932 . French Ind. China , Dr. A. Kerr ( NHMUK , individual number 012832503; slide NHMUK 010315534 ). Description . Male. Length of fore wing 10 mm . Thorax and abdomen densely covered with brown scales, bunch of long dark-brown scales on tip of abdomen. Fore wing light-brown with dense spotty dark-brown pattern of strokes throughout all wing, fringe mottled: dark at veins, light between veins. Hind wing dark-brown with yellow costal edge and yellow fringe. Male genitalia. Uncus very robust, strongly extended from base to apex, with deep triangle incision (for half of uncus length); tegumen robust; gnathos arms of medium length; gnathos small; valve short, poorly sclerotized, lanceolate, costal edge almost smooth, abdominal edge hypertrophied, strongly sclerotized, small dentate harpe on abdominal edge (in medium third); juxta cup-like; saccus tiny; phallus short, curved in medium third, gradually narrowing from middle to top. Female unknown. Diagnosis . Externally, the new species is closer to O. millemaculata , from which it differs in the darker color, more split uncus and the harpe situated closer to the abdominal edge of the valve. Distribution . Northern Laos ( Kerr 1933 ; Jacobs 1962 ). Etymology . The new species is named after its collector – the most active researcher if the Indo-China fauna, the Irish doctor A.F.G. Kerr (1877–1942) ( Fig. 32 ), who made a trip to the highest point of Laos in 1932 and collected insects along the way.