Promalactis tenuiclavifera Wang, 2020

Liu, Chen & Wang, Shuxia, 2020, Genus Promalactis Meyrick, 1908 (Lepidoptera: Oecophoridae) from Laos, with descriptions of five new species, Zootaxa 4755 (2), pp. 390-398 : 392

Promalactis tenuiclavifera Wang , sp. nov.

( Figs. 2 , 10 )

Type material. Holotype ♂, Dong Hua Sao National Biodiversity Conservation Area (15.18°N, 106.13°E), Cham- pasak, Laos, 958 m, 29.VII.2019, coll. YS Bae, MJ Qi & DJ Lee et al., slide No. LC 19241.

Paratype: 1♂, same data as holotype.

Diagnosis. This new species is similar to P. caperatiella Kim & Park, 2014 in the male genitalia. It can be distinguished from the latter by the valva produced to a rectangular process in distal 1/6 and the two equally sized cornuti; whereas in P. caperatiella , the distal 1/5 of the valva is produced to a sub-crescent process and the two cornuti are unequally sized.

Description. Adult ( Fig. 2 ). Wingspan 10.0‒11.0 mm.

Head with vertex and frons yellow, tinged with pale brownish yellow laterally. Labial palpus with second segment dim ochreous yellow on outer surface, orange yellow on inner surface; third segment with basal 1/3 whitish yellow, distal 2/3 dark ochreous brown mixed with black scales. Antenna with scape white, black at apex; flagellum black annulated with yellow on dorsal surface.

Thorax and tegula pale rust brown. Forewing with basal 3/4 dark yellowish brown, distal 1/4 greyish yellow; costal spot large, rounded, cream white, with pale ochreous yellow scales on outer 1/3, with dense black scales on inner and posterior margins, extending from beyond distal 1/3 to above lower angle of cell; basal fascia slender, edged with black scales along inner margin; antemedian fascia from basal 1/4 of costal margin sinuate to distal 1/4 on dorsum, parallel with basal fascia, widened anteriorly, edged with black scales on inner margin, with orange yellow on outer margin; ill-defined blackish brown band from before end of fold to below costal spot, not diffused to tornus; apex with dense blackish brown scales; cilia orange yellow, grey along distal part of costal margin, mixed with greyish brown around tornus distally. Hindwing and cilia brown.

Male genitalia ( Fig. 10 ). Uncus wide at base, narrowed to basal 3/5, distinctly narrowed from distal 2/5 to apex. Gnathos almost as long as uncus; gnathos plate short, uniformly narrow, rounded at apex; lateral arm wide, bandshaped, longer than gnathos plate. Tegumen bifurcate from posterior 1/3; lateral arm narrowed anteriorly. Valva with basal 2/3 rectangular, then abruptly narrowed to distal 1/6, distal 1/6 produced to a rectangular process, serrate on edges, straight at apex; costa very narrow, reaching basal 2/3; sacculus slightly wide at base, concave at dorsal 2/5, distal 1/3 produced to a free clavate process, setose distally. Saccus clubbed, as long as valva, narrowly rounded apically. Juxta being a large irregular plate. Aedeagus strong, straight, longer than valva; two cornuti equally sized, strong, spine-shaped.

Female unknown.

Distribution. Laos (Champasak).

Etymology. The epithet of this new species is derived the Latin tenui- and clavifera, referring to the clavate distal process of the sacculus.

Figures

FIGURES 1‒8. Adults of Promalactis spp. 1, P. unidentalis, holotype ♂; 2, P. tenuiclavifera, holotype ♂; 3, P. introflexa, holotype ♂; 4, P. bolikhamsaiana, holotype ♂; 5, P. serrulata, holotype ♂; 6, P. carinata Du, Li et Wang, 2011; 7, P. flavidia Kim, 2018; 8, P. apicuncata Wang, 2018. Scales=2 mm.

FIGURES 9‒14. Genitalia of Promalactis spp. 9, P. unidentalis, holotype ♂, slide No. LC19247; 10, P. tenuiclavifera, holotype ♂, slide No. LC19241; 11, P. introflexa, holotype ♂, slide No. LC19242; 12a, P. introflexa, paratype ♀, slide No. LC19302, 12b, enlarged signum, slide No. LC19246; 13, P. bolikhamsaiana, holotype ♂, slide No. LC19262; 14, P. serrulata, holotype ♂, slide No. LC19250. Scales=0.2 mm.