Promalactis albimarginalis 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 : 310-311

Promalactis albimarginalis Wang , sp. nov.

( Figs 1 , 7 )

Type material. China, Guangxi: Holotype ♂, Huaping (23.97°N, 109.72°E), 950 m, 7.VIII.2016, leg. WC Li, slide No. DZH11068.

Diagnosis. The new species is similar to P. latuncata Wang, Du et Li 2013 in forewing pattern, but they have differently shaped male genitalia. It can be distinguished from other species of the rubra species-group by the costa with the distal 3/5 produced to a free process bent ventrad preapically, and the saccus with a short spine-shaped apical process.

Description. Adult ( Fig. 1 ). Forewing length 7.0 mm. Head with vertex and occiput dark brown, with metalic luster, frons yellow. Labial palpus: basal and second palpomeres yellow on inner surface, ochreous yellow on outer surface; third palpomere black except white apically, longer than 2/3 length of second palpomere. Antenna: scape white; flagellum with basal several flagellomeres white and rest of flagellomeres white alternated with black on dorsal surface, dark brown on ventral surface. Thorax and tegula bright dark brown. Forewing deep ochreous brown, with ochreous brown scales; greyish black along basal 1/4 of costal margin; two white streaks margined with black scales: antemedian streak from basal 1/3 of dorsum extending obliquely outward to basal 1/4 below anterior margin of cell, then indistinctly extending inward to below costal margin; dorsal streak from end of fold extending obliquely inward to distal 1/5 of posterior margin of cell; fringe dark ochreous brown, white from apex to about middle of termen distally, greyish black on posterior half of termen and around tornus. Hindwing and fringe dark grey. Foreleg black except femur white ventrally, tibia with a white spot at middle dorsally, with a tuft of white scales at apex, tarsus with basal two tarsomeres and apical tarsomere white at apex, third tarsomere white at base; midleg pale yellow ventrally, white dorsally except tarsus black, basal tarsomere white basally and apically, second and apical tarsomeres white at apex; hindleg yellow ventrally, black dorsally, tibia with a tuft of white scales at apex, tarsus with basal and apical tarsomeres white at end, second and third tarsomeres white entirely.

Male genitalia ( Fig. 7 ). Uncus broad at base, narrowed to basal 2/3, distal 1/3 clubbed, rounded apically. Gnathos slightly shorter than uncus; mesial plate lingulate, broad at base, narrowed to basal 2/5, distal 3/5 equally wide, with squamous protuberances, obtuse apically; lateral arm banded, slightly shorter than mesial plate. Tegumen narrow posteriorly, convex laterally; lateral arms narrowed to pointed apex. Valva wide at base, narrowed toward apex; costa with basal 2/5 extremely narrow, distal 3/5 wide and free, forming a sub-coracoid distal process, extending obliquely ventrad from preapex to pointed apex; sacculus broad at base, narrowed to basal 2/3, distal 1/3 free, uniform to before rounded apex, oblique upward, ending before apex of costal process. Saccus triangular, about 2/3 length of uncus, with a small pointed apical process. Juxta with lateral lobes heavily sclerotized, asymmetrical: left lateral lobe with basal 3/5 slightly wide, inner margin serrate, with a large denticle at basal 3/5, narrowed from basal 3/5 to pointed apex, curved outward distally, reaching posterior 1/3 of tegumen; right lateral lobe bifurcate, about 2/3 length of left lateral lobe, extending obliquely outward, pointed at apex; basal lobe tear-shaped. Aedeagus straight, slightly longer than valva, basal 1/4 slender, uniformly thick from basal 1/4 to 3/4, distal 1/4 broadest, with tiny dense spines; cornutus spine-shaped, placed distally.

Female unknown.

Distribution. China (Guangxi).

Etymology. The specific epithet of the new species is derived from the Latin albus and marginalis, referring to the fringe of the forewing which is white from apex to middle of the termen distally.

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.