Promalactis serrulata 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 : 394

Promalactis serrulata Wang , sp. nov.

( Figs. 5 , 14 )

Type material. Holotype ♂, Phou Khao Khouay National Protected Area (18.40°N, 103.09°E), Bolikhamsai, Laos, 272 m, 3.VIII.2019, coll. YS Bae, MJ Qi & DJ Lee et al., slide No. LC 19250.

Diagnosis. This new species is similar to P. folivalva Wang, 2018 in the male genitalia. It can be distinguished from P. folivalva by the costa of the valva serrate distally, the juxta without distinct lateral arms and the aedeagus with a nail-like cornutus; whereas in P. folivalva , the costa of the valva is smooth, the juxta has long lateral arms, and the aedeagus has a long cornutus bearing 3‒4 apical spines ( Jia & Wang 2018).

Description. Adult ( Fig. 5 ). Wingspan 10.0 mm.

Head with vertex cream white, frons silvery grey, occiput rust brown. Labial palpus with second segment pale ochreous yellow on outer surface, orange yellow on inner surface, with a white dot before apex; third segment black tinged with pale ochreous yellow, white at apex. Antenna with scape cream white; flagellum black annulated with cream white on dorsal surface.

Thorax and tegula rust brown, thorax with cream white spot distally. Forewing rust brown, darker between basal and antemedian fasciae; markings white edged with black scales: costal spot at distal 1/3, inverted sub-triangular, extending to above lower margin of cell before lower angle; basal fascia slender, from above base of fold oblique outwardly to dorsum; antemedian fascia from before basal 1/4 of costal margin to basal 3/5 of dorsum, oblique outward, parallel with basal fascia, evenly wide; dorsal streak from before end of fold oblique outward to below costal spot, straight; apical spot ovate, with dense black scales on inner margin; cilia greyish brown mixed with yellowish brown except white on extension of apical spot. Hindwing and cilia brown.

Male genitalia ( Fig. 14 ). Uncus wide at base, narrowed to pointed apex, with sparse setae laterally. Gnathos shorter than uncus; gnathos plate sub-triangular, narrowed to rounded apex; lateral arm shorter, wide. Tegumen bifurcate from posterior 1/3; lateral arm narrowed anteriorly. Valva foliate, widened medially, narrowed from middle to rounded apex, with a short strong apical spine; costa arched, serrate distally; sacculus narrow, setose distally. Saccus shorter than uncus, straight on posterior margin, wide at base, narrowed to posterior 1/3, then abruptly narrowed to pointed apex. Juxta sub-rectangular, concave at middle on posterior margin, forming two triangular posterolateral lobes pointed at apex; basal lobe inverted sub-triangular, small, less than 1/3 length of saccus. Aedeagus slightly longer than valva, uniformly strong; cornutus strong, nail-like, about 1/6 length of aedeagus.

Female unknown.

Distribution. Laos (Bolikhamsai).

Etymology. The epithet of this new species is derived from the Latin serrulatus, referring to the costa of the valva serrate distally.

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.