Promalactis flagellaris Wang, Du & Li 2013, sp. nov.

(Figs 9, 43)

Type material: Holotype ♂, THAILAND, Phu Luang Wildlife Sanctuary (17°08'N, 101°40'E), Loei Province, 700−900 m, 8−14.x.1984, leg. Karsholt, Lomholdt & Nielsen, genitalia slide No. ZMUC-NK017 (ZMUC).

Description. Imago (Fig. 9) with wingspan 9.0 mm. Head with vertex shining silvery white, frons brown, occiput dark brown. Labial palpus with basal and second segments yellow on inner surface, ochreous yellow on outer surface; third segment dark ochreous brown except white at base, about same length as second. Antenna with scape white; flagellum with basal several flagellomeres white, remaining ones white and dark brown on dorsal surface, dark brown on ventral surface. Thorax dark ochreous brown, tegula dark brown. Forewing yellow; white streak from base of fold to basal 1/5 of dorsum, edged with ochreous brown on inner margin; broad ochreousbrown fascia from between basal 3/8 and 5/8 of costal margin to dorsum, almost straight, with a white streak on inner margin posteriorly, which extends to near upper margin of cell and is edged with black scales, with a triangular white spot on outside anteriorly, which extends down to midwing; tornus with an indistinct, triangular dark-gray spot; apex dark gray mixed with ochreous-brown scales; cilia yellow, dark gray along distal part of costal and dorsal margins. Hindwing and cilia gray. Foreleg black, tarsus with white spots on dorsal surface; midleg black, tibia with a few white scales at middle on dorsal surface, tarsus with white spots on dorsal surface; hindleg yellow on ventral surface, grayish yellow on dorsal surface, tarsus with white spots on dorsal surface.

Male genitalia (Fig. 43). Uncus heavily sclerotized, broad U shaped, with two lateral lobes: thin at base, broadened to obliquely truncate apex, with a curved fold from middle to near apex. Gnathos heavily sclerotized, small, about 1/2 length of uncus, narrowly triangular, rounded at apex; lateral arms very narrow, sclerotized, band shaped, about same length as gnathos. Tegumen branched from posterior 2/5, roundly projected postero-laterally, triangularly narrowed anteriorly. Valva nearly almond shaped, broad and rounded basally, gradually narrowed to apex; costa broadly convex; ventral margin straight. Sacculus well defined, almost same width, produced to an enlarged and free, setose, nearly fan-shaped apical process, with a long flagelliform ventro-apical process curved back to base of valva, broad at base, tapering to acute apex. Saccus elongate and slender, almost same length as valva, pointed at apex. Juxta a weakly sclerotized, triangular plate, with a tubular basal process reaching 1/5 length of saccus. Aedeagus thin, slightly curved, about twice length as saccus, pointed at apex; cornutus absent.

Female unknown.

Diagnosis. This new species is similar to P. peculiaris Wang & Li, 2004. It can be distinguished by the narrowly triangular gnathos, the costa without process, the sacculus with a flagelliform ventro-apical process and the saccus almost same length as the valva in the male genitalia. In P. peculiaris, the gnathos is club shaped, the costa has a long leaf-like process arising from the base, the sacculus has no ventro-apical process and the saccus is about 2/5 length of the valva.

Distribution. Thailand (Loei).

Etymology. The specific name is derived from the Latin flagellaris (= flagellum shaped), referring to the shape of the ventro-apical process of the sacculus in the male genitalia.