Stenoloba mediana, Han & Kononenko, 2021

Han, Hui Lin & Kononenko, Vladimir S., 2021, Two new species of Stenoloba Staudinger, 1892 and one Victrix Staudinger, 1879 from East Asia and China (Lepidoptera, Noctuidae, Bryophlilinae), Zootaxa 4951 (2), pp. 342-352 : 343-344

Stenoloba mediana , sp. n.

( Figs 1 , 9 , 16 )

Type material. Holotype: male, Cambodia, Phnom Samkos Wildlife Sanctuary , N12º12 ′45.6′′ E102º53 º19.2′′, Alt. 839 m, 16.ii.2013, Bae Y.S., Ju Y.D, Park B.S., Lee H.J., genit. prep. hhl-3523-1 . Paratype: female, same locality and collectors as the holotype, 17.ii.2013, genit. prep. hhl-3524-2 ( NEFU) .

Diagnosis. The new species belongs to the S. futii species - group, which was not previously recorded in the continental part of the Southeast Asia. Stenoloba mediana is most similar to S. benjamini Behounek & Kononenko, 2010 ( Figs 2 , 10 , 17 ), but differs from it by the more acute forewing shape, paler wings colouration with distinct, rather contrasting pattern formed by thin black crosslines, a double antemedial line with prominent blackish suffusion; the thorax bears a crest formed by brown and red scales, and the patch of reddish scales on tornal edge of the wing in subbasal field. In these characters it also differs from other Indonesian species of the S. futii species group. In the male genitalia, S. mediana differs from S. benjamini and other related species by the more massive, broader, short uncus, and the somewhat broader and more massive valva; the less elongate sacculus, which is more quadrangular and massive compared with S. benjamini and other species of S. futti- group; in the aedeagus the vesica broadly tubular, curved ventrally, much wider and stronger than in S. benjamini . In the female genitalia S. mediana differs fom S. benjamini by somewhat broader and shorter antrum and more circulate corpus bursae (elongate in S. benjamini ).

Description. Adult ( Fig. 1 ). Wingspan: male, 20 mm, female 22 mm. Head and thorax pale greenish; thoracic crest expressed, brown, surrounded with reddish scales; ground colour of forewing pale olive-grey suffused with ash; costal area from base of wing to subapical mark pale salad-green; basal field pale-greenish in costal area, white bordered with black line in medial area; subbasal field whitish with red scales along in tornal margin of wing; antemedial line twin, black, suffused with blackish scales; submedial line marked on costal area and joined with antemedial line; medial field behind antemedial line whitish, suffused with reddish-grey scales around reniform; orbicular spot not expressed, reniform, B-shaped, weakly expressed in blackish scales; postmedial line thin, black, twin in costal field, bordered outside by white line or suffusion; subterminal and terminal fields weakly separated by diffused whitish line and grey dashes; subterminal streak prominent, black; subterminal area suffused with pale ash-grey scales; terminal line expressed as broken row of small black streaks; cilia grey terminally, whitish basally. Hindwing grey-brown, darker towards apex, paler grey, basally and around ventral margin; discal spot and transversal line grey, traceable; cilia grey and whitish.

Male genitalia. ( Fig. 9 ). Uncus vestigial, short, more massive and, broader than in S. benjamini ( Fig. 10 ) tegumen and vinculum thin, length of tegumen about 2X higher than that of vinculum; juxta shield-like, transtilla with weakly sclerotized plates; valva massive, somewhat broader and less curved compared with S. benjamini , with almost parallel margins from mid toward apex and quadrangular-rounded on apical margin, bearing one strong spine on apex; saccular plate slightly extending above edge of valva; aedeagus rather short and massive; vesica broadly tubular, curved ventrally, wide, without additional diverticula or scobination.

Female genitalia. ( Fig. 16 ). Papillae anales small, rather weak, apophyses posterior slightly shorter than apophyses anterior, antrum rather large and broad. ( Fig. 17 ), ductus bursae broad and short; corpus bursae rounded, with prominent lateral appendix bursae.

Etymology. The species name refers to characteristic feature of its forewing pattern—broad, distinct, oblique medial fascia.

Distribution. The species is known only from its type locality Phnom Samkos Wildlife Sanctuary, Cambodia. Two specimens were collected in mid-February from the montane tropical forest at altitude 839 m.

Figures

FIGURES 1–8. Stenoloba spp. (1–5) and Victrix spp. (6–8), adults. 1. S. mediana sp. n., male holotype, Cambodia, genit. prep. hhl-3523-1; 2. S. benjamini, male, Malaysia, Borneo, genit. prep. hhl-3842-1; 3. S. fuscobrunnea sp. n., male, holotype, Laos, genit. prep. hhl-3844-1; 4. S. chlorographa, male, China, genit. prep. hhl-3851-1; 5. S. viridimicta, male, China, Yunnan, genit. prep. hhl-1330-1; 6. V. noloides sp. n., male, holotype, China, genit. prep. hhl-4070-1; 7. Ditto, female, paratype, genit. prep. hhl-4071-2; 8. V. sinensis, male, holotype, China (ZFMK).

FIGURES 9–13. Stenoloba spp., male genitalia. 9. S. mediana sp. n., male, holotype, Cambodia, genit. prep. hhl-3523-1; 10. S. benjamini, male, Malaysia, Borneo, genit. prep. hhl-3842-1; 11. S. fuscobrunnea sp. n., male, holotype, Laos, genit. prep. hhl-3844-1; 12. S. chlorographa, male, China, Xizang, genit. prep. hhl-3851-1; 13. S. viridimicta, male, China, Yunnan, genit. prep. hhl-1330-1.

FIGURES 14–19. Stenoloba spp. (16–17) and Victrix spp. (14, 15, 18, 19), male and female genitalia. 14. V. noloides sp. n., male, holotype, China, genit. prep. hhl-4070-1; 15. V. sinensis, male, paratype, China, 1927VK (ZFMK); 16. S. mediana sp. n., female, paratype, Cambodia, genit. prep. hhl-3524-2; 17. S. benjamini, female, Malaysia, genit. prep. hhl -3570-2; 18. V. noloides sp. n., female, paratype, China, genit. prep. hhl-4071-2; 19. V. sinensis, female, paratype, China, 2016VK (ZFMK).