Stenoloba fuscobrunnea, 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 : 344-345

Stenoloba fuscobrunnea , sp. n.

( Figs 3 , 11 )

Type material. Holotype: male, Laos, Namha , 22.iii.2016. Xing Yue, Liu, genit. prep. hhl-3844-1 ( NEFU) . Paratype: 1 male (in worn condition) same locality, data and collector .

Diagnosis. Judging by wing pattern and the characteristic structure of the male genitalia this new species belongs to the Stenoloba futti species-group, althouth it has no closely related species and occupies a special place in the group. It is the second species of the S. futti species–group in continental Southeast Asia. Externally it differs from other species in the S. futti –group by its somewhat larger size (27 mm vs 20-22), brown or olive brown ground colour of forewing with intensive ash-grey dusting in medial, subterminal and terminal areas, and elements of the wing pattern formed by thin black lines. In the male genitalia it differs in the presence of a very large spatulate subscaphium and the vesica armed with two robust short cornuti on broad base (these characters are not recorded in any other species of the group). The other male genitalic characters (shape and arming of valva, vestigial uncus, thin tegumen and vinculum) correspond to the ground plan of male genitalia in the S. futti species–group ( Behounek & Kononenko 2010).

Description. Adult ( Fig. 3 ). Wingspan: male, 27 mm. Head and thorax brown-grey, patagia bordered by darkbrown; thoracic crest expressed, dark reddish-brown. Ground colour of forewing dark brown with olive-grey suffusion in costal and tornal areas and light ash-grey dusting in medial, subterminal and terminal areas; basal field olive-grey, bordered with thin black mark; subbasal field pale olive-grey bordered with thin w-like subbasal line; antemedial line double, black, bordered inside by a diffused brown line; in the costal area it is weakly expressed and joined with subbasal line by black streak; medial line marked in costal and ventral areas by black streaks; medial field behind antemedial line olive-grey in costal and central areas, suffused with whitish and grey scales around reniform to apical angle; orbicular and reniform spots faint; orbicular rounded, reniform very faint, marked by blackish and whitish scales; postmedial line thin, black; subterminal and terminal fields in costal area weakly separated by diffuse grey line, in rest of wing by brown band; subterminal streak prominent, contrasting, black; subterminal area whitish in costal area, suffused with whitish and grey scales; terminal line expressed as broken row of small blackish streaks; cilia grey-brown, basally whitish. Hindwing pale yellowish-grey, paler basally and around ventral margin, darker grey-browntoward outer margin; discal spot and transversal lines visible; cilia whitish, checkered with grey.

Male genitalia. ( Fig. 11 ). Uncus vestigial, extremely small, scaphium sclerotised, strongly developed, appearing as a spatulate, medially wide sclerotised plate with long neck, acute apically; tegumen and vinculum, almost equal in length; juxta plate-like, extended vertically, twice as long as wide; transtilla with sclerotized plates; valva 2.5 as wide basally as in apical third, gradually tapered apically, bearing one strong apical spine; saccus broad, massive, U-like; sacculus rather short, massive, saccular plate rounded, not extending costa of valva; aedeagus moderate

in length, massive, vesica broadly tubular, with two broad sub-basal diverticula, bearing two robust short spine-like cornuti on broad base.

Female unknown.

Etymology. The species name refers to its characteristic forewing colouration with brown ground colour and intensive pale ash-grey with greenish tint suffusion in central to apical part of forewing.

Distribution. The species is known only from its type locality — Namha National Biodiversity Park, Laos. One specimen was collected in last week of March in tropical forest.

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.