Syzeuxis seminanis Prout, 1926

Li, Jing, Xue, Dayong, Han, Hongxiang & Galsworthy, Anthony C., 2012, Taxonomic review of Syzeuxis Hampson, 1895, with a discussion of biogeographical aspects (Lepidoptera, Geometridae, Larentiinae), Zootaxa 3357, pp. 1-24 : 8

Syzeuxis seminanis Prout, 1926

Figs 4 , 16 , 28

Syzeuxis seminanis Prout, 1926a , Novit. zool., 33: 13. Holotype 3, India: Assam, Khasi Hills. (BMNH)

Materials Examined. INDIA: 13, Holotype, Assam, Khasi Hills, March 1894, nat. coll., Rothschild Bequest B.M. 1939-1 ( BMNH); 13, Paratype, Khasia Hills, April 1894, nat. coll. ( BMNH); 13, Khasis, nat. coll., Geometridae Genitalia slide no. 20791 ( BMNH).

Description. Antennae in male bipectinate and ciliate at tip. Labial palpus brown, rough-scaled. Frons, vertex, dorsal side of thorax yellowish brown. Dorsal side of abdomen yellowish brown mixed with black scales. Wing pattern. Forewing length: 3 9 mm. Wings yellowish brown, diffused with black brown speckles, a little paler on hindwing. Forewing with outer margin under apex slightly concave, then straight to anal angle. Forewing with antemedial and postmedial lines dark yellowish brown, forming triangular black patches on costa; terminal line black, more distinct than in other species, but discontinuous under apex and under M3. Hindwing with greyish discal spot; postmedial line distinct, black brown, broad, almost parallel to outer margin; terminal line black brown, more complete than that of forewing. Hindwing in male without basal lobe. Fringes black where terminal line present and yellowish brown where terminal line absent on forewing; yellowish brown on hindwing and black on anal angle. Underside: pale yellow diffused with dense grey to black speckles, more distinct on hindwing; both wings with black brown discal spots; postmedial line on forewing broader towards inner margin but not reaching it, straight and black on hindwing. Forewing with a small areole. Male genitalia. Uncus large but strongly narrowed towards tip. Gnathos developed, sclerotized, with a large but tapered, narrow median process. Valva narrower than previous two species, apex blunt, costa without process. Juxta a rounded sclerite, setose on posterior margin. Aedeagus with a posterior spinose tuft; vesica wrinkled and slightly sclerotized. Female genitalia. Unknown.

Diagnosis. S. seminanis , S. magnidica , S. subfasciaria , S. heteromeces , S. furcalineas , S. nigrinotata and S. pavonata share many common features, such as the small size, the absence of a basal lobe on the male hindwing; the lack of biangulate hindwing discocellulars. S. seminanis differs from the other species in that the postmedial line on the hindwing is a single line, not double, nor X-shaped. In the male genitalia, the uncus is long and narrow.

Distribution. India (Khasi Hills).

Figures

FIGURES 2 – 13. Adults. 2. Syzeuxis trinotaria (Moore), female; 3. S. tessellifimbria Prout, holotype, female; 4. S. seminanis Prout, holotype, male; 5. S. extritonaria Xue, holotype, male; 6. S. neotritonaria Xue, holotype, male; 7. S. magnidica Prout, lectotype, male; 8. S. subfasciaria (Wehrli), paralectotype, male; 9. S. heteromeces Prout, holotype, male; 10. S. furcalineas sp. nov., holotype, male; 11. S. nigrinotata (Warren), lectotype, male; 12. S. pavonata sp. nov., holotype, male; 13. S. calamisteria Xue, holotype, female. Scale bar = 1 cm.

FIGURES 14 – 19. Male genitalia. 14. Syzeuxis trinotaria (Moore); 15. S. tessellifimbria Prout; 16. S. seminanis Prout; 17. S. extritonaria Xue; 18. S. neotritonaria Xue; 19. S. magnidica Prout. Scale bar = 1 mm.

FIGURES 26 – 37. Aedeagus. 26. Syzeuxis trinotaria (Moore); 27. S. tessellifimbria Prout; 28. S. seminanis Prout; 29. S. extritonaria Xue; 30. S. neotritonaria Xue; 31. S. magnidica Prout; 32. S. subfasciaria (Wehrli); 33. S. heteromeces Prout; 34. S. furcalineas sp. nov.; 35. S. nigrinotata (Warren); 36. S. pavonata sp. nov.; 37. S. calamisteria Xue. Scale bar = 1 mm (except scale bar = 0.5 mm for fig. 35.)