Jankowskia acuta, 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

Jankowskia acuta sp. nov.

Figs. 11–12 , 27 , 35

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 greyish brown, short and stout, extending slightly beyond frons. Vertex greyish brown.

Thorax: Dorsal side dull grey. Hind tibia in male without hair-pencil. Forewing length: male 22 mm. Wings grey. Forewing with outer margin straight; costa pale, diffused with short longitudinal greyish brown flecks; medial line and postmedial line black, paralleling to each other below CuA1; a yellowish brown patch outside postmedial line, the dull brown shadow in the middle of the patch indistinct; discal spot black, indistinct. Hindwing with basal area grey; medial line black, distinct, equal to postmedial line in width; postmedial line black, protruded outwards between M1 and M3, then slightly protruded inwards below M3. Underside greyish white, transverse lines weak, the faint broad band outside postmedial line indiscernible.

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

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

Male genitalia: Uncus triangular, gradually tapered, length equal to basal width. Posterior processes of tegumen triangular, short, about one-seventh length of uncus, without long setae apically. Gnathos with median process 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 slightly protruded outwards at middle; sacculus broadened basally. Saccus not elongate. Juxta asymmetrical, left sclerotized process hooklike, acute apically, about one-half length of juxta. Spines bundle of cornuti about one-third length of aedeagus.

Female genitalia: unknown.

Diagnosis. This new species is similar to J. curva on wing patterns. The main differences lie in that the hindwing postmedial line is less protruded inwards below M3; the uncus is gradually tapered; the ventral margin of the valva is a little more protruded outwards at middle; the left sclerotized process of the juxta is differently shaped, shorter and stouter than in J. curva .

Material examined. Holotype, 3, CHINA: Gansu: Kangxian Qinghe Linchang, 1450–1650 m, 15.VII.1998, coll. Zhang Xuezhong ( IZCAS).

Etymology. The specific name is form the Latin word acutus, which means acute.

Distribution. China (Gansu).

Remarks. Due to the very poor condition of the type specimen, some characteristic features of the wing patterns are missing.

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.