Promalactis serraticostalis 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 : 61-62

Promalactis serraticostalis Wang , sp. nov.

( Figs 18 , 35 , 47 )

Type material. CHINA, Zhejiang: Holotype ♂, Wuyanling (27.72°N, 119.65°E), 680 m, 28.VII.2005, leg. YL Xiao, slide No. DZH12115 . Paratypes: 2♂, 2♀, 2.VIII.2005, other data same as holotype, slide Nos. DZH12114 ♀, DZH12371 ♂, W05025 ♂.

Diagnosis. The new species can be distinguished from its congeners in the male genitalia by the basal half of the costa heavily sclerotized and serrate, the lateral arms of the juxta with a large triangular process on the outer margin distally, and the cornutus with a dense cluster of spines distally; in the female genitalia by the very short lamella postvaginalis narrowly extended horizontally.

Description. Adult ( Fig. 18 ). Wingspan 8.0–9.0 mm. Head ochreous black, white laterally. Labial palpus with basal segment white; second segment grey mottled with dark brown scales; third segment dark brown, white basally and distally, slightly shorter than second segment. Antenna with scape white, dark brown terminally and on anterior and posterior margins; flagellum black alternated with white dorsally, dark brown ventrally. Thorax and tegula rust ochreous. Forewing dark rust ochreous, mottled with black scales; costal spot black, quadrate, from basal 2/5 oblique outward to anterior angle of cell, with a silvery white dot on outer margin anteriorly; distal patch black, wedge-shaped, extending from apex along termen to tornus; other markings silvery white margined with black scales: cell with a spot at basal 1/3 and at posterior angle; fold with a short streak at base, at basal 2/5 and 4/5 respectively; dorsum with three short streaks: first streak from basal 1/6 directly reaching base of fold, second streak from before middle and third streak from distal 1/5 oblique outward meeting two streaks at fold respectively; apical spot small, round; termen with two silvery white dots; tornus with diffused black scales, with a silvery white dot set before tornus; cilia yellowish brown except black on costal margin distally and around tornus. Hindwing and cilia dark ochreous grey. Legs black, mid and hindlegs dark grey ventrally; fore tibia with a small white spot at base and middle, with a tuft of white scales at apex, mid tibia with a small white spot at base dorsally, with a tuft of white scales at middle and apex, all tarsi white at apices of basal two tarsomeres.

Male genitalia ( Fig. 35 ). Uncus weakly sclerotized, broad at base, narrowed to 2/5, distal 3/5 curved ventrad, lanceolate, rounded at apex. Gnathos about 2/5 length of uncus; mesial plate lingulate, weakly sclerotized, rounded apically; lateral arm narrow and short, band-like. Tegumen divided from posterior 2/3, thereafter narrowed to obtuse apex. Valva with basal 2/3 subparallel, distal 1/3 narrowed to rounded apex; costa with basal 3/5 widened, heavily sclerotized, serrate, excavate beyond basal 2/3; sacculus narrow, setose distally, produced to an apical spine directed dorsad. Saccus about half length of uncus, broad at base, narrowed to apex. Lateral arm of juxta heavily sclerotized, pointed at apex, straight on inner margin, with a large triangular process on outer margin near apex; basal lobe finger-like, reaching half length of saccus. Aedeagus stout, slightly shorter than valva, sclerotized ventrodistally; cornutus short, located at basal 3/5, less than 1/3 length of aedeagus, with a dense cluster of short and fine spines apically.

Female genitalia ( Fig. 47 ). Apophyses anteriores about half length of apophyses posteriores. Eighth sternum weakly sclerotized, short, with dense spicules, obtusely rounded on posterior margin. Ostium bursae very large. Lamella postvaginalis narrowly and horizontally banded, sclerotized. Antrum funnel-shaped, short, membranous. Ductus bursae membranous, about 1.3 times length of corpus bursae, narrowed anteriorly, with two irregular sclerotized narrow transverse bands posteriorly, margined with spines. Corpus bursae membranous, sub-elliptical; signum absent.

Distribution. China (Zhejiang).

Etymology. The specific epithet of this species is derived from the Latin serratus and costalis, referring to the serrate costa in the male genitalia.

Figures

FIGURES 13‒18. Adults of Promalactis spp. 13, P. ramivalvata, holotype, ♂; 14, P. aculeiformis, holotype, ♂; 15, P. apicitriangula, paratype, ♂; 16, P. curvispinosa, paratype, ♂; 17, P. medimacularis, holotype, ♂; 18, P. serraticostalis, holotype, ♂. Scales = 2 mm, except 15 scale = 1 mm.

FIGURES 31‒35. Male genitalia of Promalactis spp. 31, P. aculeiformis, holotype, slide No. DZH11036; 32, P. apicitriangula, holotype, slide No. JYY17715, 32a, enlarged cornutus, slide No. JYY17714; 33, P. curvispinosa, holotype, slide No. DZH11035; 34, P. medimacularis, holotype, slide No. JYY17800; 35, P. serraticostalis, holotype, slide No. DZH12115, 35a, enlarged cornutus. 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.