Promalactis oliviformis Wang, 2019

Wang, Shuxia & Jia, Yanyan, 2019, Taxonomic study of the genus Promalactis Meyrick, 1908 (Lepidoptera: Oecophoridae) IV. The sakaiella species group, with descriptions of fifteen new species, Zootaxa 4563 (3), pp. 491-515 : 507

Promalactis oliviformis Wang , sp. nov.

( Figs 15 , 31 )

Type material. BRUNEI: Holotype ♂, Bukit Retak (4.35°N, 115.30°E), 1365 m, 1¯ 4.V.1989, coll. M. G. Allen and K. R. Tuck, slide No. BMNH-33555 (BMNH).

Diagnosis. This species is similar to P. cribrata sp. nov., and the diagnosis can be found in the latter species.

Description. Adult ( Fig. 15 ) wingspan 12.5 mm. Head with vertex greyish white, frons brown, occiput blackish brown. Labial palpus with second segment deep ocherous yellow on inner surface, deep ocherous brown on outer surface; third segment with basal 1/3 white, distal 2/3 ocherous brown. Antenna with scape white; flagellum with basal 1/3 white and distal 2/3 white annulated with dark brown on dorsal surface, dark brown on ventral surface. Thorax and tegula shinning blackish brown. Forewing pale ocherous yellow, black along basal 3/5 of costal margin; dorsum with two spots: basal spot sub-elliptical, black, edged with a white stripe along outer margin; distal spot sub-triangular, grey, from about distal 1/4 reaching basal 3/5 of cell, edged with a white stripe on inner margin; postmedian fascia deep grey, from basal 3/5 of costal margin extending to tornus, narrowed posteriorly, its inner margin edged with black scales, outer margin with a white spot anteriorly, beyond white spot set an ill-defined yellow patch; distal patch grey mixed with black, extending along termen and meeting postmedian fascia; cilia ocherous yellow, deep grey along distal part of costal margin and around tornus. Hindwing and cilia grey.

Male genitalia ( Fig. 31 ): Uncus broad U-shaped, joined basally by a wide transverse band; lateral arms slender, curved and narrowed to pointed apex. Gnathos with lateral arms slender, curved, rounded at apex; median process cylindrical, thick and straight, as long as lateral arms. Tegumen broad, sclerotized along anterior margin, concave in triangle at middle anteriorly. Valva wide at base, slightly narrowed to basal 2/3, distal 1/3 produced triangularly to a rounded apex, with dense spines distally; costa with a large sub-triangular basal process extending obliquely inward toward base of vinculum, with a small rounded preapical process bearing a tuft of fine spines; ventral margin straight in basal 2/3, obliquely truncate in distal 1/3. Sacculus broad, slightly narrowed distally, as long as half length of ventral margin of valva. Saccus wide at base, narrowed to basal 3/4, distal 1/4 subparallel, rounded at apex. Juxta Y shaped; lateral arms slender, ribbon-like, weakly sclerotized, with three apical spines, longest spine reaching 3/5 length of valva; basal lobe olive-like. Aedeagus slender, slightly curved, pointed at apex, approximately as long as valva; cornutus absent.

Female unknown.

Distribution: Brunei.

Etymology. This epithet refers to the olive-like basal lobe of the juxta.

Figures

FIGURES 11–16. Adults of Promalactis spp. 11. P. spiniflagellata sp. nov., holotype, ♂; 12. P. grandilobata sp. nov., holotype, ♂; 13. P. arciformis sp. nov., holotype, ♂; 14. P. bornensis sp. nov., holotype, ♂; 15. P. oliviformis sp. nov., holotype, ♂; 16. Head of P. apicidigitata sp. nov. Scales: 9–15 =1.0 mm, 16 =0.5 mm.

FIGURES 27–31. Male genitalia of Promalactis spp. 27. P. grandilobata sp. nov., holotype, slide No. DZH12117; 28. P. arciformis sp. nov., holotype, slide No. JYY17636; 29. P. cribrata sp. nov., paratype, slide No. BMNH-33577; 30. P. bornensis sp. nov., holotype, slide No. MNHU-NK011; 31. P. oliviformis sp. nov., holotype, slide No. BMNH-33555. Scales =0.2 mm, 29a, b =0.1mm (not available for No. 30).