Promalactis introextensa Wang, 2021

Wang, Shuxia & Liu, Chen, 2021, Taxonomic study of the genus Promalactis Meyrick, 1908 (Lepidoptera Oecophoridae) XI. The rubra species-group and the fuscimacularis species-group with descriptions of six new species, Zootaxa 4996 (2), pp. 309-321 : 311-312

Promalactis introextensa Wang , sp. nov.

( Figs 2 , 8 )

Type material ( SCAU). China, Sichuan: Holotype ♂, Yuanfangdejia, Longcanggou, Yingjing, 2.VII.2016, slide No. SCAU-NK-003 . Paratype: 1♂, 5.VII.2016, otherwise same data as for holotype .

Diagnosis. The new species is similar to P. uncinata Wang, 2006 in forewing pattern and in male genitalia. It can be distinguished in the male genitalia by the mesial plate of the gnathos widened before the rounded apex, and the distal process of the sacculus obtusely angled ventrally. In P. uncinata , the mesial plate of the gnathos is uniform distally, and the distal process of the sacculus is right-angled ventrally.

Description. Adult ( Fig. 2 ). Forewing length 6.5‒7.0 mm. Head with frons whitish yellow, vertex and occiput bronzy. Labial palpus: second palpomere orange yellow; third palpomere ochreous brown mixed with blackish except white at tip. Antenna: scape white except brown along anterior margin; flagellum with ventral surface brown, ciliate; dorsal surface white annulated with brown except basal a few flagellomeres entirely white. Thorax and tegula bronzy. Forewing yellowish brown, darkened between fold and dorsum; markings white edged with blackish brown scales: antemedian fascia from basal 1/3 of dorsum oblique outward to before basal 1/3 of costal margin; dorsal streak from before tornus extending inward to basal 2/3 of cell and crossing middle width of wing; costal spot elongate sub-triangular, from before distal 1/4 of costal margin narrowed obliquely inward to outer margin of cell, orange yellow on its anterior margin; fringe brown. Hindwing and fringe greyish brown. Foreleg blackish brown, tibia white at base, middle and apex on dorsal surface; midleg white, tibia greyish brown on basal half and tinged with brown distally on dorsal surface; hindleg white, tibia greyish brown on dorsal surface; all tarsi on dorsal surface with first tarsomere brown distally, second and third tarsomeres brown distally, fourth and fifth tarsomeres brown entirely, apex white.

Male genitalia ( Fig. 8 ). Uncus broad at base, narrowed to pointed apex, with long setae laterally. Gnathos shorter than uncus; mesial plate broad lingulate, with scale-like protuberances on distal 1/4, widened before rounded apex; basal arm shorter than mesial plate. Tegumen with lateral arm narrowed anteriorly. Valva sub-rectangular, with a sclerotized, densely setose, semicircular area distally, oblique at apex; costa straight, papillarily produced apically. Sacculus wide and sclerotized, slightly less than half width of valva; distal 3/5 setose, narrowed to apex, produced to a spine-shaped distal process directed dorsad, touching tip of costal margin. Saccus shorter than uncus. Juxta a weakly sclerotized conical plate, slightly narrowed posteriorly, shorter than uncus. Aedeagus nearly same length as valva, bar-shaped basally, partly sclerotized distally, distally produced to a spine; without distinct cornutus.

Female unknown.

Distribution. China (Sichuan).

Etymology. The specific epithet of the new species is from the Latin intro - and extensus, referring to the dorsal streak inwardly oblique from the dorsum.

Figures

FIGURES 1‒6. Adults of Promalactis spp. 1, P. albimarginalis, holotype ♂, 1a, ditto, showing white distal fringe; 2, P. introextensa, paratype ♂; 3, P. magnistica, holotype ♂; 4, P. anteromacularis, holotype ♂; 5, P. fuscimacularis, holotype ♂; 6, P. folivalvaris, holotype ♂. Scales=2 mm.

FIGURES 7‒10. Genitalia of Promalactis spp. 7, P. albimarginalis, holotype ♂, slide No. DZH11068; 8, P. introextensa, holotype ♂, slide No. SCAU-NK-003; 9, P. magnistica, holotype ♂, slide No. LC19588; 10, P. magnistica, paratype ♀, slide No. LC19596. Scales=0.2 mm.