Promalactis medilargissima Wang, 2020

Wang, Shuxia & Liu, Chen, 2020, Taxonomic study of the genus Promalactis Meyrick, 1908 (Lepidoptera: Oecophoridae) IX. The maculosa species-group, with descriptions of eighteen new species, Zootaxa 4890 (1), pp. 38-66 : 49-50

Promalactis medilargissima Wang , sp. nov.

( Figs 12 , 29 , 43 )

Type material. CHINA, Tibet: Holotype ♂ , Zhala Village (29.63°N, 97.42°E), Chayu County, 2266 m, 29. VI.2019, leg. MJ Qi & JQ Deng, slide No. LC19307 . Paratypes: 1♂, 2♀, same data as holotype, slide Nos. LC19429 ♀, LC19437 ♀, LC19446 ♂.

Diagnosis. This species can be distinguished from its congeners in the male genitalia by the valva with the middle lobe being the largest of the three apical lobes, and the aedeagus having a spine before apex. It is similar to P. tricuspidata Wang et Li, 2004 in the female genitalia by the shorter antrum less than 1/4 the length of the ductus bursae, and the ductus bursae posteriorly having two plates bearing dense spines oriented both leftward and rightward; in P. tricuspidata , the antrum is approximately half the length of the ductus bursae, and the ductus bursae has a cluster of heavy spines all inserted into a single plate and directed leftward.

Description. Adult ( Fig. 12 ). Wingspan 10.0–11.0 mm. Head with vertex dark brown, frons snowy white, occiput dark brown mottled with snowy white scales. Labial palpus with second segment black on outer surface, basal half dark grey and distal half black on inner surface; third segment black except white at base and apex. Antenna with scape white on dorsal surface, grey on ventral surface; flagellum black annulated with white on dorsal surface, blackish grey on ventral surface. Thorax and tegula dark brown on basal half, yellowish brown on distal half. Forewing yellowish brown; markings white edged with black scales: costal spot placed beyond basal 3/5, narrowed obliquely outward to above posterior angle of cell, sinuate on outer margin; cell with a longitudinal streak extending outward from basal 1/5; fold with a slim streak at base, second streak from middle extending inward to meeting streak in cell, third streak from distal 1/4 extending upward and arched to tornus; dorsum with a streak near base extending inward to below fold, second streak at basal 2/5 and third streak at distal 1/3 subparallelly extending obliquely outward to fold; apical spot oval; tornus with a white dot, surrounded by diffused black scales; cilia yellowish brown. Hindwing and cilia grey. Fore- and midlegs with femora black dorsally, pale brown ventrally, tibiae black, with a white spot at base and middle, with a tuft of white scales apically, tarsi black except white at apices of basal two tarsomeres; hindleg brown ventrally, grey dorsally except tarsus black dorsally, white at apices of basal two and fourth tarsomeres and on entire apical tarsomere.

Male genitalia ( Fig. 29 ). Uncus with basal half extremely dilated, distal half straight and slender. Gnathos shorter than uncus; mesial plate short, broad lingulate; basal arm longer than mesial plate. Tegumen divided from posterior 2/5; lateral arm distinctly narrowed to apex. Valva narrow at base, widened to apex, with three apical lobes: dorsal lobe slender, digitate, setose apically, with a sclerotized process from its base ventrally; middle lobe largest, from near base narrowed to rounded apex, setose ventrally; ventral lobe slightly longer than dorsal lobe, ridged and with fine spines along dorsal margin; costa extending to base of dorsal lobe; sacculus wide at base, narrowed to base of ventral lobe. Saccus shorter than uncus, wide at base, narrowed to pointed apex. Juxta fused basally, fused part narrowed anteriorly; lateral arm uniformly slender except narrowed to pointed apex distally, apically reaching posterior margin of tegumen. Saccus shorter than uncus, narrowed to apex. Aedeagus straight, about same length as valva, with a spine before apex; cornutus about 3/4 length of aedeagus, pointed at apex, with a bundle of short spicules at about distal 1/3.

Female genitalia ( Fig. 43 ). Apophyses anteriores about 2/3 length of apophyses posteriores. Eighth tergite rectangular, with setae on posterior margin; Eighth sternum deeply concave at middle, rounded posteriorly, setose. Lamella antevaginalis trapezoidal medially, with dense verrucous processes, extending outward anteriorly, then curved backward and extending obliquely inward, forming two digitate lateral arms. Antrum less than 1/4 length of ductus bursae, slightly widened posteriorly. Ductus bursae sclerotized, dilated and partly membranous posteriorly, narrowed anteriorly, with two plates posteriorly: a narrow plate bearing dense spines oriented leftward, a round plate bearing dense spines oriented rightward. Corpus bursae membranous, ovate, about half length of ductus bursae; signum absent.

Distribution. China (Tibet).

Etymology. The specific epithet of the new species is derived from the Latin medius and largissimus, referring to the middle distal lobe of the valva being the largest of the three.

Figures

FIGURES 7‒12.Adults of Promalactis spp. 7, P. plicata, holotype, ♂; 8, P. bomiensis, paratype, ♂; 9, P. fasciserrata, holotype, ♀; 10, P. brevipalpa, holotype, ♂; 11, P. libona, holotype, ♂; 12, P. medilargissima, holotype, ♂. Scales = 2 mm.

FIGURES 25‒30. Male genitalia of Promalactis spp. 25, P. plicata, holotype, slide No. JYY17788; 26, P. bomiensis, holotype, slide No. LC19226, 26a, enlarged cornutus; 27, P. brevipalpa, holotype, slide No. DZH12288, 27a, enlarged cornutus; 28, P. libona, holotype, slide No. JYY17787, 28a, enlarged cornutus; 29, P. medilargissima, holotype, slide No. LC19307, 29a, enlarged cornutus; 30, P. ramivalvata, paratype, slide No. DZH10184. Scales = 0.2 mm.

FIGURES 42‒48. Female genitalia of Promalactis spp. 42, P. libona, paratype, slide No. JYY17722, 42a, enlarged signa, slide No. JYY17723; 43, P. medilargissima, paratype, slide No. LC19429; 44, P. ramivalvata, paratype, slide No. LC19438, 44a, enlarged ductus bursae; 45, P. curvispinosa, paratype, slide No. DZH11037; 46, P. medimacularis, paratype, slide No. JYY17829; 47, P. serraticostalis, paratype, slide No. DZH12114; 48, P. tricuspidata Wang et Li, 2004, slide No. JYY17977. Scales = 0.2 mm.