Promalactis bicornea Wang, 2019

Wang, Shuxia & Jia, Yanyan, 2019, Taxonomic study of the genus Promalactis Meyrick, 1908 (Lepidoptera: Oecophoridae) IV. The sakaiella species group, with descriptions of fifteen new species, Zootaxa 4563 (3), pp. 491-515 : 501-502

Promalactis bicornea Wang , sp. nov.

( Figs 3 , 25 , 37 )

Type material. CHINA, Hainan Province: Holotype ♂, Gaoshanling (19.93°N, 109.64°E), Lingao County, 171 m, 18.VIII.2017, slide No. JYY17533 . Paratypes (6♂, 2♀): 5♂, 1♀, 18–19.VIII.2017, same data as holotype, slide No. JYY17547 ♀ ; 1♂, 1♀ , Bawangling , Changjiang County, 146 m, 13.VIII.2017, coll. Xia Bai, Ping Liu and Shuai Yu, slide No. JYY17550 ♀ .

Diagnosis. This species is close to P. lobatifera Wang, Kendrick et Sterling, 2009 , P. spinifasciaria sp. nov. and P. spiniflagellata sp. nov. in the forewing pattern and in the juxta having a spinous flagellate lateral process in the male genitalia. It can be distinguished from P. lobatifera and P. spinifasciaria sp. nov. by the uncus and the gnathos not concave apically, and from P. spiniflagellata sp. nov. by the uncus with distal half sharply narrowed to a digitate form, the gnathos narrowed to a narrowly rounded apex, and the bilobed cornate juxta. In P. spiniflagellata sp. nov. the uncus is only slightly narrower distally, the gnathos is uniform and rounded at apex, and the juxta is complete.

Description. Adult ( Fig. 3 ) wingspan 5.5 mm. Head creamy white, mixed with greyish brown scales on frons and occiput. Labial palpus with first and second segments dark brown except white at apex of second segment; third segment yellowish white except black at base and before apex, approximately 2/3 length of second segment, pointed at apex. Antenna with scape white on ventral surface, blackish brown on dorsal surface; flagellum black on ventral surface, white and black on dorsal surface. Thorax and tegula blackish brown mixed with creamy white. Forewing ground color golden yellow, with blackish brown scales basally; costal margin with a wide black streak extending from base to antemedian fascia; with two blackish brown fasciae mottled white scales: antemedian fascia narrower, from basal 1/4 of costal margin straightly to dorsum, its outer margin edged with sparse white scales; postmedian fascia broad, from basal 2/3 of costal margin straight to end of fold; distal patch widened at apex, narrowed along termen to meet postmedian fascia; cilia with basal half white mixed with black, distal half golden yellow. Hindwing and cilia grey. Fore- and midlegs black ventrally except whitish yellow at apices of tibiae and each tarsomere, yellowish white dorsally; hindleg greyish yellow except blackish brown at apices of tibia and each tarsomere.

Male genitalia ( Fig. 25 ). Uncus with basal half wide and parallel, distal half digitate, sparsely setose. Gnathos triangular, heavily sclerotized, narrowly rounded at apex; lateral arms extremely wide, slightly narrowed toward gnathos. Tegumen divided from posterior 2/5, anterior 3/5 elongate triangular, rounded apically. Valva subrectangular, setose distally; apex obtuse, produced dorsoapiccally to a triangular process bearing a few spines; costa with a large elliptical process arising from beyond middle, concave in distal 1/3. Sacculus broad, more than half width of valva, slightly narrowed and fused with valva distally, with a spinous area dorsomedially. Saccus triangular, almost as long as uncus, narrowly rounded apically. Juxta fused and weakly sclerotized basally, bilobed distally; each lobe cornate, wide basally, narrowed and produced to a spine distally, reaching posterior 2/5 of tegumen; lateral process arising from middle, flagellate, spinous, first extending to base of costal process where it is curved, then extending outward to beyond apex of valva; basal lobe conic, slender, nearly reaching middle of saccus. Aedeagus slender, narrowly rounded at apex, slightly longer than valva; cornutus absent.

Female genitalia ( Fig. 37 ): Apophyses anteriores stronger and longer than apophyses posteriores. Eighth tergum concave at middle on posterior margin, with wrinkles. Ostium bursae large, round; antrum short, almost parallel laterally. Ductus bursae membranous, almost as long as corpus bursae. Corpus bursae elliptical; signa very large, elongate elliptical, with dense denticles.

Distribution. China (Hainan).

Etymology. This epithet is derived from the Latin bi- and corneus, referring to the shape of the two juxta lobes.

Figures

FIGURES 1–4. Adults of Promalactis spp. 1. P. apicidigitata sp. nov., holotype, ♂; 2. P. biprocessa sp. nov., holotype, ♂; 3. P. bicornea sp. nov., holotype, ♂; 4. P. cribrata sp. nov., holotype, ♂. Scales =1.0 mm

FIGURES 21–26. Male genitalia of Promalactis spp. 21. P. auremacularis sp. nov., holotype, slide No. MNHU-NK036; 22. P. biprocessa sp. nov., paratype, slide No. JYY17670; 23. P. curvitaeniata sp. nov., holotype, slide No. DZH11058; 24. P. lvovskyi sp. nov., holotype, slide No. TLMF-NK001; 25. P. bicornea sp. nov., holotype, slide No. JYY17533; 26. P. spiniflagellata sp. nov., holotype, slide No. JYY17526. Scales =0.2 mm (not available for No. 21).

FIGURES 37‒40. Female genitalia of Promalactis spp. 37. P. bicornea sp. nov., paratype, slide No. JYY17547; 38. P. arciformis sp. nov., paratype, slide No. JYY17635; 39. P. cribrata sp. nov., paratype, slide No. JYY17665; 40. P. bornensis sp. nov., paratype, slide No. MNHU-NK009. Scales =0.2 mm (not available for No. 40).