Stenoloba acutivalva Han & Kononenko, 2009

Han, H. L. & Kononenko, V. S., 2009, A review of the genus Stenoloba Staudinger, 1892 from China, with description of 6 new species and 7 new records for China (Lepidoptera: Noctuidae, Bryophilinae), Zootaxa 2268 (1), pp. 1-22 : 18-19

Stenoloba acutivalva Han & Kononenko sp. n.

( Figs. 17 , 34 )

Type material. Holotype: male, Aut. Reg. Guangxi, Guilin , 1.vi.1999 (coll. X.Z. Zhang) . Paratypes: 1 male, Prov. Hainan, Diaoluo , 8.v.1984 (coll. M.B. Gu) ; 1 male, Aut. Reg. Guangxi, Miaorshan, Jiuniutang, 10.vii.1985 (coll. Z.Q. Wang). The types are preserved in the collection of Institute of Zoology Chinese Academy of Sciences, Beijing .

Diagnosis. The new species belongs to the S. viridescens species group. Externally it differs from its allies by a simple forewing pattern, clearly marked with moss-green, and with white basal field, inner part of subbasal field and subtornal mark. The male genitalia are characterized by the structure of the valva with upcurved acute apex and quadrangular plate in apical part of costal margin of valva. The structure of aedeagus and vesica are similar to that of allied species.

Description. Adult ( Fig. 17 ). Wingspan 24–26 mm. Head and thorax brownish-grey; thoracic crest not expressed. Forewing relatively broad, costa somewhat arched at base, medial part almost straight, apex finely pointed. Ground colour of forewing dark, shiny blackish-brown with somewhat green suffusion; costal area with more expressed and darker green scales. Base of wing black-brown, basal field mossy-green, basal line white, indistinct; subbasal field dark-brown suffused with green, with large mossy-green patch divided by white line in inner area; medial field brownish grey, postmedial line thin, dark-brown, bordered with white, in inner part filled with mossy-green and with prominent white tornal streak; subterminal and terminal fields dark brownish-grey, subterminal line widely diffused; terminal line as diffused streaks; cilia brown; claviform expressed by somewhat dark-green or brown-green diffused spot; orbicular and reniform indistinct; in costal field lines expressed as dark spots. Hindwing brownish-grey, darker in outer part; discal spot traceable; cilia yellowish.

Male genitalia ( Fig. 34 ). Uncus absent; tegumen narrow, vinculum broad, equally high with tegumen, juxta wide, subtriangular, transtilla moderately sclerotized. Valva rather narrow, elongate; sacculus narrow, long, with plate-like distal lobe; clasper sclerotized, directed diagonally; costa rather strong, with triangular extension in distal third and separate quadrangular extension covered by strong hairs; ventral margin of valva sclerotized on whole length, curved apically as separate acute extension. Valva asymmetrical, extension on left valva broader, but shorter than right one. Aedeagus thin and long, almost equal to valva in length, tapered apically; carinae as sclerotized band, vesica narrowly tubular, curved ventro-laterally at middle, covered with fine spine-like cornuti, bearing one finger-like diverticulum.

Female unknown.

Etymology. The species name “ acutivalva ” refers to the characteristic acute extension on the tip of the valva in male genitalia.

Distribution. South China (Aut. Reg. Guangxi and Prov. Hainan).

Figures

FIGURES 9–17. Stenoloba spp., adults. 9. S. brunneola, male; 10. S. brunneola, male, holotype (ZFMK); 11. S. viridimicta; 12. S. lichenosella, male; 13. S. glauca, male; 14. S. rufosagittoides, male, holotype; 15. S. rufosagitta; 16. S. viridescens, male; 17. S. acutivalva, male, holotype.

FIGURES 30–34. Stenoloba spp., male genitalia. 30. S. glauca, genit. prep. HHL-1233-1; 31. S. rufisagittoides, holotype, genit. prep. ASZ-163-1; 32. S. rufosagitta, genit. prep. ASZ-158-1; 33. S. viridescens, genit prep. HHL-1241- 1; 34. S. acutivalva, holotype, genit. prep. HHL-1244-1.