Promalactis equisaccula Wang, 2019

Wang, Shuxia & Liu, Chen, 2019, Taxonomic study of the genus Promalactis Meyrick, 1908 (Lepidoptera Oecophoridae) V. The unistriatella species group, with descriptions of seven new species, Zootaxa 4668 (4), pp. 588-598 : 592-593

Promalactis equisaccula Wang , sp. nov.

(Figs 3, 10, 17)

Type material. THAILAND: Holotype ³, Khao Yai (12.8167° N, 99.933° E), 720 m, 21.II.1988, coll. Allen, slide No. BMNH-33559 ( NHMUK) . Paratype: 1♀, same data as holotype, slide No. BMNH-33558 ( NHMUK) .

Diagnosis. This new species can be easily distinguished from its congeners by the tegumen with a large thumbshaped process posterolaterally, the valva produced to a spinous oval process ventroapically, and the sacculus with a straight thumb-shaped process dorsoapically.

Description. Adult (Fig. 3). Wingspan 8.0‾9.0 mm. Head with vertex snowy white, frons brown, occiput dark brown. Labial palpus with second segment yellow on inner surface, dark brown on outer surface; third segment white except black apically, stout, shorter than second segment. Antenna with scape white; flagellum with basal 1/3 thick, distal 2/3 slender, dorsal surface with basal 2/3 white, distal 1/3 white and dark brown, ventral surface brown. Thorax and tegula dark brown. Forewing with basal 1/3 blackish brown, distal 2/3 blackish brown with ocherous brown scales; antemedian fascia white, from basal 1/4 of costal margin extending obliquely outward to distal 1/4 of dorsum, anterior 1/4 widened, posterior 3/4 very narrow, edged with a wide faint ochreous yellow band; with a triangular ochreous brown patch at distal 1/6; cilia yellow, distal part of costal and ventral margins deep greyish brown. Hindwing and cilia grey. Foreleg blackish brown, tarsus white at apex of each tarsomere dorsally; midleg blackish brown, tibia with a tuft of long white scales at apex dorsally, tarsus white at apex of each tarsomere; hindleg yellowish grey ventrally, deep grey dorsally, tarsus pale yellow.

Male genitalia (Fig. 10). Uncus wide, sub-rectangular basally, sharply narrowed to a curved hook, pointed at apex. Tegumen widened posteriorly, narrowed anteriorly; posterior margin produced to large thumb-shaped process laterally. Valva broad at base, narrowed to middle, distal half sub-quadrate, nearly straight apically; ventroapical corner produced to a spinous oval process; costa with basal half concave semicircularly, distal half straight. Sacculus broad, straight, parallel, produced to a thumb-shaped long process dorsoapically. Saccus short, nearly semielliptical, narrowly rounded anteriorly. Juxta weakly sclerotized, sub-cylindrical, with a small slender anterior lobe. Aedeagus broad basally, slenderer and more sclerotized distally, curved before apex, with an irregular quadrate plate at distal 1/4; cornutus absent.

Female genitalia (Fig. 17). Apophyses anteriores about 1/3 as long as apophyses posteriores, 8 th sternum narrow, with spinules and sparse setae posteriorly. Lamella postvaginalis sclerotized, triangular, with large sclerotized process arising from its anterolateral corner, which extended and narrowed to both pointed posterior and anterior ends, arched inward. Ostium bursa large. Ductus bursae heavily sclerotized and narrowed to 3/5, largely dilated and coiled at 2/3, within dilated part set a sub-triangular plate edged with three short spines; distal 1/3 membranous. Corpus bursae sub-pyriform, densely verrucous; accessory bursae ovate, extending from anterior margin; signum rhomboid, with small denticles, placed anteriorly.

Distribution. Thailand.

Etymology. The specific epithet is derived from the Latin prefix equi - and the Latin word sacculus, referring to the parallel sacculus.