Promalactis bacilliforma Wang, 2024

Wang, Shuxia, Liu, Chen & David, Lees, 2024, Partial revision of Promalactis Meyrick (Lepidoptera: Oecophoridae), based on specimens deposited in the Natural History Museum, London, Zootaxa 5536 (1), pp. 1-58 : 21-22

Promalactis bacilliforma Wang , sp. nov.

( Figs 20 , 53 )

Type material. Thailand: Holotype ♂, Khao Yai NPHQ , 850 m, 10–13.VII.1989, leg. J.D. & D.J. Bradley & Angoon Lewvanich, slide No. NHMUK010317021 .

Paratypes. Thailand: 1♂, Mt. Khiew , Khao Yai NP, 1200 m, leg. J.D. & D.J. Bradley & Angoon Lewvanich, slide No. NHMUK010317015 ; 1♂, Khao Yai NPHQ , 750 m, 26.II.–2.III.1990, leg. J.D. Bradley, D.S. Fletcher & Angoon Lewvanich, slide No. NHMUK010317020 .

Diagnosis. The new species can be distinguished from other known species of the group in the male genitalia by the rectangular uncus with a small auriculate lateral process near the base, the valva with a tuft of fine setae on the ventral surface distally, and the free saccular process ovately dilated distally and far exceeding apex of the costal portion of valva.

Description. Adult ( Fig. 20 ). Forewing length 4.0– 4.5 mm.

Head. Vertex snowy white, frons deep greyish brown, occiput ochreous brown. Labial palpus with second segment dark brown on outer surface, ochreous yellow on inner surface; third segment black except white at apex. Antennal scape snowy white dorsally, grey ventrally; flagellum black, annulated with white dorsally except basal five flagellomeres entirely white.

Thorax. Mesonotum black, tegula deep rust brown. Forewing ochreous yellow, dark ochreous brown between fold and dorsum; markings white edged with black scales: costal spot sub-triangular, from distal 1/3 to above posterior angle of cell; basal streak from dorsum oblique inward to base of fold; antemedian streak from basal 2/5 of dorsum to basal 2/5 of anterior margin of cell, uniformly wide, parallel with basal streak; tornal spot sub-triangular, extending to posterior angle of cell, right below costal spot; apical spot rounded; termen with a white dot below costal spot; fringe orange yellow except greyish black on distal part of costal margin apically and beyond tornus. Hindwing and fringe grey. Foreleg black, tibia with a white dot at middle, with a tuft of white scales at apex, tarsus white at apices of basal two tarsomeres; midleg brown ventrally, black dorsally, tibia with a tuft of white scales apically, tarsus white at apices of basal two and apical tarsomeres; hindleg yellowish brown ventrally, black dorsally, tarsus white at apices of basal three tarsomeres and on entire distal two tarsomeres.

Male genitalia ( Fig. 53 ). Uncus elongate rectangular except slightly wide at base, with a small auriculate process near base laterally. Gnathos shorter than uncus; mesial plate sub-digitate, with squamous protuberances distally; basal arm with a ring at base. Tegumen furcate from posterior 1/3; lateral arm slightly narrowed to rounded anterior end. Valva subparallel basally, furcate distally: costal part produced into an elongate thumb-shaped process, with a tuft of fine setae on ventral surface distally; sacculus wide at base, narrowed to a free distal process, distal process clubbed, dilated and setose in distal 1/2, far exceeding apex of costal portion. Saccus triangular, narrowed to rounded apex. Juxta rectangular, weakly sclerotized; basal lobe slender, narrowed to pointed apex. Phallus slightly longer than valva, tapered from near apex to pointed apex; cornutus absent.

Female unknown.

Distribution. Thailand.

Etymology. The specific epithet is derived from the Latin bacillus and forma, referring to the shape of the free distal process of the sacculus in the male genitalia.

Figures

FIGURES 17–23. Adults of Promalactis spp. 17. P. vulgaris sp. nov.; 18. P. apicibilobata sp. nov.; 19. P. apiciserrulata sp. nov.; 20. P. bacilliforma sp. nov.; 21. campanimorpha sp. nov.; 22. P. ciliavalva sp. nov.; 23. P. abortiva sp. nov. All males and holotypes. Scale bar = 1.0 mm.

FIGURES 52–57. Male genitalia of Promalactis spp. 52. P. apiciserrulata sp. nov.; 53. P. bacilliforma sp. nov.; 54. P. campanimorpha sp. nov.; 55. P. ciliavalva sp. nov.; 56. P. abortiva sp. nov.; 57. P. magnisaccata sp. nov. All holotypes. Scale bar: 52–53, 55–57 = 0.2 mm; 54 = 0.5 mm.