Promalactis bitriangula Wang, 2017

Hu, Sha & Wang, Shuxia, 2017, Taxonomic study of the genus Promalactis Meyrick (Lepidoptera, Oecophoridae) from Hainan Island, China (III), Zootaxa 4303 (4), pp. 590-600 : 591-593

Promalactis bitriangula Wang , sp. nov.

( Figs. 2 , 10 )

Type material. CHINA, Hainan Island: Holotype ♂, Diaoluoshan Nature Reserves (18.725°N, 109.868°E), 980 m, 23.IV.2014, coll. Tengteng Liu, Wei Guan & Xuemei Hu, slide No. HS 15076. Paratype: 1♂, same data as holotype, slide No. HS 15067 ♂.

Diagnosis. This new species is superficially similar to P. multimaculella Lvovsky, 2000 . It can be distinguished from the latter by the distinctly different male genitalia. In P. bitriangula sp. nov., the broad valva has its maximum width about half of its length, the costa is produced to a small triangular process, and the two short cornuti are less than half the length of the aedeagus. In P. multimaculella , the elongate valva has its maximum width approximately 1/4 of its length, the costa of the valva is not produced to a triangular process, and the single cornutus is slightly shorter than the aedeagus.

Description. Adult ( Fig. 2 ) wingspan 7.5 mm. Head with frons shining white, vertex ochreous brown, occiput brown mixed with white. Labial palpus with second segment blackish brown except distal 1/3 white on inner surface and black at apex; third segment with basal 1/3 white, median 1/3 brown, distal 1/3 pale brown on outer surface and white on inner surface. Antenna with scape blackish brown mixed with white; flagellum black ventrally, black alternated with white dorsally. Thorax and tegula ochreous yellow, mottled black scales. Forewing ochreous yellow, with scattered black scales basally and distally; costal margin with a large blackish brown semiovate patch at middle, across upper margin of cell ventrally, with a second large blackish brown diffusion just before apex; 13 white speckles edged with sporadic black scales: curved white streak beyond costal 2/3; fold with white spot above and below base; cell with white spot at basal 1/3 and end as well as at 2/5 and 4/5 on lower margin; dorsum with a white spot at base, with fine white short streak at basal 1/5 and 2/5 reaching fold; three white spots evenly spaced from apex along termen to end of fold; tornal spot black, diffused; cilia yellow. Hindwing and cilia brown. Foreleg blackish brown, tibia and tarsus with white markings on dorsal surface; midleg with femur gray, tibia grayish brown ventrally, blackish brown dorsally, tarsus blackish brown, marked with white dorsally; hindleg grayish brown, tarsus ringed with black dorsally.

Male genitalia ( Fig. 10 ). Uncus broad at base, narrowed to 4/5; distal 1/5 digitiform, curved ventrad. Gnathos quadrate, granulate, with a membranous process anteriorly. Tegumen branched from anterior 1/3, thereafter narrowed triangularly. Valva broad, with maximum width approximately half of its length; costa convex at middle, with sparse setae, distally produced to a small free triangular process with pointed apex, not exceeding apex of valva; sacculus broad in basal 1/3, narrowed from 1/3 to rounded apex, setose distally, with a sclerotized triangular dorsoapical process slightly directing inward. Saccus about same length as uncus, slightly narrowed from anterior 2/5 to narrowly rounded apex. Juxta V-shaped; lateral lobes slender in basal 1/3, widened quadrangularly in distal 2/3, pointed apically; basal lobe narrowed anteriorly, reaching anterior 1/3 of saccus. Aedeagus slightly shorter than valva, stout, narrow at base, thickened to 4/5, distal 1/5 produced triangularly and curved ventrad; with two cornuti: one curved, thickened before pointed distal spine, another slender, straight, with three distal spines closely appressed to each other.

Female unknown.

Distribution. China (Hainan).

Etymology. The specific epithet is derived from the Latin bi - and triangulus, referring to the distal process of the costa and the dorsoapical process of the sacculus.

Figures

FIGURES 1 – 8. Adults of Promalactis spp. 1, P. anterodilata sp. nov., paratype, male; 2, P. bitriangula sp. nov., holotype, male; 3, P. longiprocessa sp. nov., holotype, male; 4, P. tenuivalvata sp. nov., holotype, male; 5, P. unifurcata sp. nov., holotype, male; 6, P. apicifurcata sp. nov., holotype, male; 7, P. longimaculata sp. nov., holotype, male; 8, P. serrata, Du, Li & Wang, male. Scale bars: 1.0 mm.

FIGURES 9 – 12. Male genitalia of Promalactis spp. 9, P. anterodilata sp. nov., paratype, slide No. HS 16019; 10, P. bitriangula sp. nov., paratype, slide No. HS 15067; 11, P. longiprocessa sp. nov., paratype, slide No. HS 14160; 12, P. tenuivalvata sp. nov., holotype, slide No. HS 15192. Scale bars: 0.2 mm.