Jankowskia improjecta, Jiang, Nan, Xue, Dayong & Han, Hongxiang, 2010

Jiang, Nan, Xue, Dayong & Han, Hongxiang, 2010, A review of Jankowskia Oberthür, 1884, with descriptions of four new species (Lepidoptera: Geometridae, Ennominae), Zootaxa 2559, pp. 1-16 : 8-9

Jankowskia improjecta sp. nov.

Figs. 13–14 , 28 , 36

Description. Head: Antenna bipectinate in male, the longest pectination about six times diameter of antennal shaft, filiform at tip. Frons blackish brown suffused with sparse grey scales, smooth-scaled. Labial palpus blackish brown, short and stout, extending slightly beyond frons. Vertex yellowish brown.

Thorax: Dorsal side greyish black. Hind tibia in male without hair-pencil. Forewing length: male 19–21 mm. Wings greyish black, transverse lines indistinct. Forewing with outer margin weakly protruded; costa diffused with dull short longitudinal greyish brown flecks; antemedial line black, strongly protruded inwards below cell; medial line black, indistinct, thickened near anal margin; postmedial line black, slightly protruded outwards between M1 and M2, protruded inwards below M2, then paralleling to medial line; the yellowish brown patch outside postmedial line indistinct, the dull brown shadow in the middle of the patch indistinct; discal spot black, indistinct. Hindwing with basal area greyish black; medial line black, indistinct, equal to postmedial line in width; postmedial line black, slightly protruded outwards between M1 and M3, then slightly protruded inwards below M3; the yellowish brown patch outside postmedial line indistinct, the dull brown shadow in the middle of the patch more distinct than on forewing. Underside greyish black, transverse lines weak, the faint broad band outside postmedial line darker, costa of forewing greyish yellow.

Venation: Male forewing: R1 and R2 separate and almost parallel; R3–5 diverging before anterior angle of cell; M1 diverging from anterior angle of cell.

Abdomen: First abdominal segment with pale grey band dorsally, remaining segments blackish brown.

Male genitalia: Uncus triangular, length equal to basal width. Posterior processes of tegumen triangular, short, about one-fifth length of uncus, each with a bundle of long setae apically. Median process of gnathos semicircular. Valva even in width; blunt terminally, bearing a large area of long setae; one cluster of long setae near center, extending dorsally; ventral margin of valva not protruded outwards at middle. Saccus small, round. Juxta symmetrical, with a wide tongue-like moderately sclerotized median dorsal process. Spines bundle of cornuti about two-fifth length of aedeagus.

Female genitalia: unknown.

Diagnosis. This new species is similar to J. acuta in the wing patterns, but can be distinguished from that species by the following differences: the forewing outer margin is protruded, but straight in J. acuta ; the transverse lines are indistinct; the hindwing postmedial line is almost straight below M3, but remarkably protruded inwards in J. acuta . In the male genitalia, the tegumen posterior processes are longer, each with a bundle of long setae apically; the ventral margin of valva is not protruded outwards at middle; the juxta is symmetrical with median dorsal process, but asymmetrical, with an apical process at the left side in J. acuta .

Material examined. Holotype, 3, CHINA: Shaanxi: Zhouzhixian Houzhenzi, 1276 m, 1.VII.2008, coll. Li Wenzhu ( IZCAS). Paratypes, 13 ( IZCAS), Gansu: Kangxian Qinghe Linchang, 1450–1650 m, 15.VII.1998, coll. Zhang Xuezhong.

Etymology. The specific name is from the Latin word improjectus which means without projecting.

Distribution. China (Shaanxi, Gansu).

Figures

FIGURES 1 – 18. Adults of Jankowskia. 1 – 2. J. athleta. 1, male, upperside; 2, male, underside; 3 – 4. J. taiwanensis. 3, male, upperside; 4, male, underside; 5 – 8. J. fuscaria fuscaria. 5, male, upperside; 6, male, underside; 7, female, upperside; 8, female, underside; 9 – 10. J. curva sp. nov., holotype. 9, male, upperside; 10, male, underside; 11 – 12. J. acuta sp. nov., holotype. 11, male, upperside; 12, male, underside. 13 – 14. J. improjecta sp. nov., holotype. 13, male, upperside; 14, male, underside; 15 – 18. J. bituminaria raddensis. 15. male, upperside; 16, male, underside; 17, female, upperside; 18, female, underside. Scale bar = 1 cm.

FIGURES 23 – 30. Male genitalia of Jankowskia. 23, J. athleta; 24, J. taiwanensis; 25, J. fuscaria fuscaria; 26, J. curva sp. nov.; 27, J. acuta sp. nov.; 28, J. improjecta sp. nov.; 29, J. bituminaria raddensis; 30, J. obtusangula sp. nov. Scale bar = 1 mm.

FIGURES 31 – 38. Aedeagus of Jankowskia. 31, J. athleta; 32, J. taiwanensis; 33, J. fuscaria fuscaria; 34, J. curva sp. nov.; 35, J. acuta sp. nov.; 36, J. improjecta sp. nov.; 37, J. bituminaria raddensis; 38, J. obtusangula sp. nov. Scale bar = 1 mm.