Problepsis, Lederer, 1853

Xue, Dayong, Cui, Le & Jiang, Nan, 2018, A review of Problepsis Lederer, 1853 (Lepidoptera: Geometridae) from China, with description of two new species, Zootaxa 4392 (1), pp. 101-127 : 103

Key to Chinese Problepsis species

1. Male antennae bipectinate............................................................................... 2

- Male antennae dentate................................................................................. 12

2. Vertex white.......................................................................................... 3

- Vertex black.......................................................................................... 4

3. Ocellus of hind wing almost pyriform............................................................. P. plagiata

- Ocellus of hind wing indistinct, with two silvery white lines.......................................... P. apollinaria

4. Ocellus of each wing incomplete.............................................................. P. transvehens

- Ocellus of each wing complete........................................................................... 5

5. Ocellus of forewing rounded or almost rounded.............................................................. 6

- Ocellus of forewing inverted pyriform or oval, posterior part narrower than anterior part............................. 8

6. Male antenna with pectinations about three times the diameter of shaft; internal margin of apex of tegumen with acute spines in male genitalia; ductus brusae without sclerite extending to corpus bursae in female genitalia.................. P. albidior

- Male antenna with pectinations slightly longer than diameter of shaft; internal margin of tegumen without spines in male geni- talia; ductus brusae with a large sclerite extending to corpus bursae in female genitalia............................... 7

7. Female antenna dentate; ocellus on underside of the forewing densely diffused with dark greyish brown scales.. P. eucircota

- Female antenna filiform; ocellus on underside of the forewing without any greyish brown scales........ P. stueningi sp. nov.

8. Internal margin of tegumen with spines in male genitalia...................................................... 9

- Internal margin of tegumen without spines in male genitalia................................................... 10

9. Male antenna with pectinations longer than two times diameter of shaft; male hind tarsus about one-half the length of tibia; length of ductus brusae more than twice of its width in female genitalia................................... P. vulgaris

- Male antenna with pectinations slightly longer than diameter of shaft; male hind tarsus about one-third or shorter than one- third the length of tibia; length of ductus brusae less than twice of its width in female genitalia................. P. paredra

10. Underside of both wings mostly with heavy dark greyish brown suffusions.................... P. delphiaria auriculifera

- Underside of both wings mostly with white or greyish white suffusions.......................................... 11

11. Ocellus of each wing with smooth outer margin; anterior margin of juxta free from sacculus in male genitalia... P. subreferta

- Ocellus of each wing without smooth outer margin; anterior margin of juxta fused to sacculus in male genitalia.............................................................................................. P. batangnesis sp. nov.

12. Vertex black......................................................................................... 13

- Vertex white......................................................................................... 14

13. Grey band between ocellus of fore- and hind wing continuous, extending to anal margin................... P. conjunctiva

- Grey band between ocellus of fore- and hind wing incontinuous...................................... P. crassinotata

14. Underside of both wings with distinct dark greyish brown postmedial lines; Socii with lateral lobes in male genitalia.................................................................................................... P. diazoma

- Underside of both wings with indistinct or invisible postmedial lines; Socii without lateral lobes in male genitalia........ 15

15. Postmedial line of forewing broadened on costa............................................................ 16

- Postmedial line of forewing narrow and weak or invisible on costa............................................. 18

16. Ocellus of forewing very large, extending outwards, often covering postmedial line....................... P. phoebearia

- Ocellus of forewing normal not very large, not contacting with postmedial line.................................... 17

17. Submarginal spots of both wings smaller, ligher, not fused; fringes white mixed with grey........ P. discophora discophora

- Submarginal spots of both wings larger, darker, partly fused; fringes mostly dark grey to blackish grey.................................................................................................... P. discophora kardakoffi

18. Postmedial line of hind wing situated far from ocellus................................................. P. shirozui

- Postmedial line of hind wing close to ocellus........................................................ P. superans