Promalactis magnisaccata 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 : 24-25

Promalactis magnisaccata Wang , sp. nov.

( Figs 24 , 57 )

Type material. Thailand: Holotype ♂, Khao Yai NP , Park HQ, 720 m, 2–4.XI.1988, leg. J.D. Bradley, Angoon Lewvanich & D.S. Fletcher, slide No. NHMUK010317008 .

Diagnosis. The new species can be distinguished from the other species of the group by the strong thumb-shaped mesial plate of the gnathos, the valva densely setose in distal 3/5 and without distinct sacculus, and the large broad saccus basally wider than the maximum width of the valva.

Description. Adult ( Fig. 24 ). Forewing length 4.0 mm.

Head. Vertex snowy white, frons dark grey, occiput black. Labial palpus with second segment black on outer surface, greyish brown on inner surface; third segment black, except white at apex on inner surface. Antennal scape snowy white dorsally, pale grey ventrally; flagellum black, alternating with white dorsally except basal three flagellomeres white.

Thorax. Mesonotum and tegula rust brown. Forewing brownish yellow; markings white edged with black scales: costal spot sub-ovate, extending from distal 2/5 obliquely outward and crossing anterior angle of cell; basal streak from dorsum oblique inward to above base of fold; antemedian streak from basal 3/5 of dorsum to basal 2/5 of anterior margin of cell, parallel with basal streak; dorsal streak from distal 1/5 of dorsum oblique outward to posterior angle of cell; tornal streak oblique inward, meeting dorsal streak, forming an arched speckle; apical spot rounded; termen with indistinct small dot below apical spot, with denser black scales; fringe orange yellow except grey around tornus. Hindwing and fringe grey. Foreleg black except femur white dorsally, tibia with white spot at base and middle, with a tuft of white scales apically, tarsus white at apices of basal two tarsomeres; midleg black except femur brown, tibia with a white spot at base, with a tuft of white scales at apex, tarsus white at apices of basal two and apical tarsomeres; hindleg yellow ventrally, black dorsally, tarsus white at apices of basal four tarsomeres and on entire apical tarsomere.

Male genitalia ( Fig. 57 ). Uncus represented by two small setose lobes. Gnathos with mesial plate elongate, strongly thumb-shaped, slightly dilated before rounded apex; basal arm longer than mesial plate. Tegumen arched mediolaterally, with a shallow anterior emargination. Valva narrow at base, slightly widened to obtusely rounded apex, densely setose in distal 3/5. Saccus large, broad triangular, narrowed to rounded apex, basal width wider than maximum width of valva. Juxta short, narrowly clubbed, with three short apical spines. Phallus slender, about 3 times length of valva; cornutus slender, approx. 1/4 length of phallus, placed distally.

Female unknown.

Distribution. Thailand.

Etymology. The specific epithet is derived from the Latin magni- and saccatus, referring to the large saccus of the male genitalia.

Figures

FIGURES 24–29. Adults of Promalactis spp. 24. P. magnisaccata sp. nov.; 25. P. minuticornuta sp. nov.; 26. P. parvissima sp. nov. (female and paratype); 27. P. polyptycha sp. nov.; 28. P. indica sp. nov.; 29. P. similidierli sp. nov. 24–25, 27–29: Males and holotypes; 26: Male and paratype. 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.