Promalactis costispinata, 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 costispinata sp. nov.

( Figs. 2 , 6 )

Type material. CHINA, Zhejiang: Holotype ♂, Baiyun, Linqu , Jingning County, 1102 m, 10.VII.2017, coll. ZG Zhang, YY Jia and J Li, slide No. JYY17794.

Diagnosis. The species is similar to P. tenuivalvata Wang, 2017 by having a narrow valva with the costa being produced to a short strong apical spine in the male genitalia. It can be distinguished by the apically-rounded uncus, the lateral arms of the juxta being widest at distal 1/3 and then narrowed to the apex, and the aedeagus lacking an apical cornutus in the vesica. In P. tenuivalvata , the uncus is truncate apically, the lateral arms of the juxta are evenly slender, and the aedeagus has an apical cornutus in the vesica.

Description. Adult ( Fig. 2 ). Forewing length 5.5 mm. Head with frons cream white, vertex brown, occiput tuft black. Labial palpus whitish yellow, second segment covered with black scales on ventral surface, third segment with dense black scales on outer surface. Antenna with scape dull yellow except blackish brown apically; flagellum black, ringed with yellow dorsally. Thorax and tegula brown, with black scales. Forewing pale ochreous yellow; costal margin with three large black patches: basal patch sub-rectangular, reaching above fold ventrally, oblique outwardly to basal 2/5 of cell on lower margin, edged with a white line on outer margin; median patch sub-quadrangular, across upper margin of cell, sparsely diffused to lower angle of cell, bordered by an irregular white streak on outer margin; distal patch extending triangularly to apex; dorsum with a large quadrate, ochreous brown spot obliquely outward to lower margin of cell, its inner and outer margins bordered by white streaks, outer streak discontinuously extending to white streak running from outer margin of median patch; tornal spot large, diffused; apex with a white dot; termen with black scales and two ill-defined white dots; cilia brownish grey along distal part of costal margin, remaining cilia dull yellow. Hindwing and cilia brown. Fore- and midlegs black, tibiae with yellow spot at base and middle as well as at apex on ventral surface, tarsi yellow at base and apex of basal tarsomere as well as at apices of second and apical tarsomeres; hindleg yellow on inner surface, femur and tibia greyish brown, tarsus blackish brown except yellowish white at apex of each tarsomere on dorsal surface.

Male genitalia ( Fig. 6 ). Uncus sub-campaniform, wide at base, slightly narrowed to about middle, then distinctly narrowed to rounded apex, with setae laterally. Gnathos approximately as long as uncus; gnathos plate lingulate, scaly on distal half, rounded apically; lateral arm relatively wide, slightly shorter than gnathos plate. Tegumen bifurcate from about middle, narrowed to obtusely truncate apex. Valva elongate narrow, length about four times median width, rounded at apex; costa obviously concave, extended to a spiniform apical process not exceeding apex of valva. Sacculus broad basally, slightly narrowed distally, setose on distal 2/5. Saccus longer than uncus, uniformly wide to before rounded apex. Juxta short; lateral arm just reaching tegumen, basal half slender, slightly widened from middle to basal 2/3, then triangularly narrowed to pointed apex; basal lobe slender, same length as lateral arm, exceeding anterior 2/3 of saccus. Aedeagus longer than valva, nearly uniform from slightly broadened base to apex; cornutus spiniform, curved, approximately half length of aedeagus.

Female unknown.

Distribution. China (Zhejiang).

Etymology. The specific epithet of this new species is derived from the Latin cost- and spinatus, referring to the costa being extended to an apical spine in the male genitalia.

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.