Promalactis trimaculata, Wang & Liu, 2020

Wang, Shuxia & Liu, Chen, 2020, Taxonomic study of the genus Promalactis Meyrick, 1908 (Lepidoptera: Oecophoridae) VIII. The densimacularis species group, with descriptions of four new species, Zootaxa 4748 (1), pp. 78-86 : 78-86

Promalactis trimaculata sp. nov.

( Figs. 3 , 7 , 10 )

Type material. CHINA, Guangdong: Holotype ♂, Dawuling (22.35°N, 110.95°E), Xinyi, 1000 m, 7‒13.VIII.2003, coll. DD Zhang, slide No. DZH12109 . Paratype: 1♀, same data as holotype, slide No. DZH12120 .

Diagnosis. This new species can be distinguished from other species of the densimacularis group in the male genitalia by the gnathos plate having the distal half broadened to a rounded apex, and by the valva being distally bilobed, with the ventral lobe much wider than the dorsal lobe and produced to a small mastoid process dorsoapically.

Description. Adult ( Fig. 3 ). Forewing length 4.0‒ 4.5 mm. Head deep yellow, occiput tuft dark brown. Labial palpus with basal and second segments yellow on inner surface, yellow mottled with black on outer surface; third segment black, yellow at base and apex. Thorax and tegula black, yellow apically. Forewing ochreous yellow; costal margin with three black patches: basal patch narrow rectangular, obliquely outward to middle of cell above fold, outer margin with a white line extending to before lower angle of cell; median patch sub-quadrate, extending obliquely outward and across upper angle of cell, outer margin with a white line reaching lower angle of cell; distal patch broadly triangular, not across midwidth of wing; apex with a white dot; dorsum with a black spot at base, reaching fold, edged with a white line on outer margin, with white streaks running respectively from basal 2/5 and distal 1/4 obliquely and parallelly outward to fold, joining white line running from outer margin of basal patch, with black scales along inner margin of both white streaks and on dorsum between white streaks; tornal spot black, diffused to lower angle of cell; termen with dense black scales, forming a narrow black band, with a white dot beyond tornus; cilia ochreous yellow, black along distal part of costal margin. Foreleg black, tibia with a small yellow spot at middle on dorsal surface; midleg yellow on dorsal surface, black on dorsal surface, tibia yellow at base on dorsal surface, with tuft of yellow scales at middle and apex; hindleg yellow on ventral surface, black on dorsal surface; all tarsi annulated with yellow on dorsal surface.

Male genitalia ( Fig. 7 ). Uncus campaniform, wide at base, slightly narrowed to 2/3, distal 1/3 digitate, rounded apically. Gnathos approximately as long as uncus; gnathos plate with basal half smooth, distal half scaly, broadened to rounded apex; lateral arm wide, band-like, about 2/5 length of gnathos. Tegumen bifurcate from near posterior margin, slightly narrowed anteriorly. Valva wide at base, slightly narrowed to about middle, distal half uniformly wide; distal 1/4 bilobed: dorsal lobe knife-like, arched and with setae on dorsal margin, pointed at apex; ventral lobe about two times as wide as dorsal lobe, obtuse apically, with a small mastoid dorsoapical process; costa concave medially. Sacculus broad at base, slightly narrowed to middle, notched at middle dorsally, distal half uniformly wide, densely setose. Saccus long, about two times length of uncus, broad at base, slightly narrowed to rounded apex. Juxta with lateral arms slightly broad basally, narrowed to pointed apex distally, reaching posterior 1/4 of tegumen apically; basal lobe slender, reaching 3/5 length of saccus. Aedeagus about two times length of valva, straight, slen- der, broad at base; cornuti being a long spine, about 2/5 length of aedeagus, and a fine spine in vesica.

Female genitalia ( Fig. 10 ). Apophyses anteriores about half length of apophyses posteriores. Eighth sternum large, sub-semicircular, with sparse setae on posterior margin. Antrum sub-trapezoidal, concave medially on posterior margin, forming two small lobes laterally. Ductus bursae long, about three times length of corpus bursae, posterior half slender, anterior half inflated, curved at anterior 1/8, with six short spines scattered from anterior 2/5 to 3/5. Corpus bursae membranous, elliptical; signum absent.

Distribution. China (Guangdong).

Etymology. The specific epithet of this new species is derived from the Latin trimaculatus, referring to the adult having three black patches on the costal margin of the forewing.

Figures

FIGURES 1‒4. Adults of Promalactis spp. 1, P. simingshana, holotype, ♂; 2, P. costispinata, holotype, ♂; 3, P. trimaculata, holotype, ♂; 4, P. yongjiana, holotype, ♂. Scales=2 mm.

FIGURES 5‒8. Male genitalia of Promalactis spp. 5, P. simingshana, holotype, slide No. JYY17798; 6, P. costispinata, holotype, slide No. JYY17794; 7, P. trimaculata, holotype, slide No. DZH12109; 8, P. yongjiana, holotype, slide No. LC19159. Scales=0.2 mm.

FIGURES 9‒10. Female genitalia of Promalactis spp. 9, P. simingshana, paratype, slide No. JYY17833; 10, P. trimaculata, paratype, slide No. DZH12120. Scales=0.2 mm.