Stenoloba uncata, Han & Kononenko, 2018

Han, H. L. & Kononenko, V. S., 2018, Twelve new species and four new records of Stenoloba Staudinger 1892 from China (Lepidoptera, Noctuidae: Bryophilinae), Zootaxa 4388 (3), pp. 301-327 : 309-310

Stenoloba uncata sp. n.

( Figs 14 , 42 )

Type material. Holotype: male, China, Prov. Yunnan, Dehong, Mengxiu , 27.iv.2013, H.L. Han & C. Zhang leg., slide HHL-2950-1, coll. NEFU.

Diagnosis. The new species is rather dissimilar to other species of the genus. Externally it can be recognized by narrow shape of forewing with arcuate costal margin and characteristic wing pattern with blackish streaks on antemedial line and distinct reniform and angled postmedial line. The male genitalia differ from those of other species by presence of huge sclerotised plate and bifurcate apex of valva. The presence of sclerotised subuncus (scaphium) and configuration of valva with prominent costal comb indicates to its affiliation to S. nigrabasalis species-group.

Description. Adult ( Fig. 14 ). Wingspan 26 mm. Head and thorax covered with brownish and ochreous-green scales. Forewing relatively narrow, with arcuate basal part of costal margin, parallel costal and ventral margins and oblique outer margin; ground colour of forewing ochre-brownish in basal part, greyish in medial part and with pale greyish-green in terminal part; basal and subbasal fields ocher-greenish-brown, with four diffused streak and blackish bash; antemedial line pale, indistinct; outer part of medial field pale grey; orbicular not expressed, reniform triangular in shape, indistinct, encircled by thin pale line; postmedial line thin dark greyish, twin, angled opposite reniform; subterminal and terminal fields greyish-green, more bright in costal area, with indistinct pale greyish subapical dash; terminal line as interrupted row of blackish dots; cilia greyish, twin, with whitish basal line. Hindwing brownish grey with paler inner area, darker along terminal margin; discal spot traceable as dark shadow; cilia yellowish-grey, twin, with pale basal line.

Male genitalia ( Fig. 42 ). Uncus reduced, short, relatively wide, flattened; subuncus (scaphium) strongly developed, appearing as a wide sclerotised plate; tegumen and vinculum narrow, moderate in length, strongly sclerotised equal in length; juxta broadly deltoid, wide at base with narrow, long apical part. Valva moderate in length, slightly curved, with parallel margins from base to subapical third; in distal third of valva costa forming strong, acute subapical sclerotised comb; apical part of valva gradually narrower to apex, which is furcated due pointed finger-like tip of apex and pointed thin apical extension; sacculus symmetrical, long, moderate broad, not extending over costal margin of valva. Aedeagus moderate large; carina long, serrate, vesica tubular, extended in mid part, armed with numerous tiny, setae-like cornuti. Female unknown.

Etymology. The species name S. uncana refers to the specialized structure of uncus in the male genitalia of the species.

Distribution. Southwest China (Prov. Yunnan). The species is known in China only from its type-locality Prov. Yunnan, Dehong, Mengxiu where it occurs in mountain forest at elevation 2000 m. Single male was collected in April.

Figures

FIGURES 1–15. Stenoloba spp., adult. 1. S. gaoligonga sp. n., male, holotype, slide HHL-2596-1; 2. S. huanxipoa sp. n., male, holotype, slide HHL-3128-1; 3. Ditto, female, paratype, slide HHL-3176-2; 4. S. chlorobrunnea sp. n., male, holotype, slide HHL-6153-1; 5. Ditto, paratype, slide HHL-6153-1; 6. S. ochraceola sp. n., male, holotype, slide HHL-2904-1; 7. S. plumbeoviridis sp. n., male, holotype, slide HHL-2920-1; 8. S. plumbeobrunnea sp. n., male, holotype, slide HHL-2955-1; 9. Ditto, paratype, slide HHL-2958-1; 10. S cucullata sp. n., male, holotype, slide HHL-6161-1; 11. S. asymmetrica sp. n., male, holotype, slide HHL-6184-1; 12. S. acontioides sp. n., female, holotype, slide HHL-6185-2; 13. S. rectilinoides sp. n., male, holotype, slide HHL-2951-1; 14. S. uncata sp. n., male, holotype, slide HHL-2950-1; 15. S. assimilina sp. n., male, holotype, slide HHL-3186-1 [all materials from coll. NEFU].

FIGURES 40–43. Stenoloba spp., male genitalia. 40. S. rectilinoides sp. n., holotype, slide HHL-2951-1; 41. S. rectilinea, slide HHL-6135-1; 42. S. uncata sp. n., holotype, slide HHL-2950-1; 43. S. assimilina sp. n., holotype, slide HHL-3188-1 [all materials from coll. NEFU].