Duolandrevus, Kriby, 1906

Zheng, Yanna & Ma, Libin, 2021, Taxonomy of the genus Duolandrevus Kirby, 1906 (Orthoptera: Gryllidae; Landrevinae) from China with a new species of the subgenus Eulandrevus Gorochov, 1988, Zootaxa 4942 (2), pp. 252-268 : 252-253

Key to species of Duolandrevus from China (based on adult males)

1. Hind wings rather short, reaching or not exceeding posterior margin of metanotal gland; ectoparameres narrowed............................................................................. Subgenus Eulandrevus Gorochov, 1988 ................................................................................................... 2

- Hind wings slightly shorter, conspicuously exceeding posterior margin of metanotal gland*; ectoparameres widened (about 4/5 of the length)........................................................... Subgenus Doulandrevus Kriby, 1996 ................................................................. D. (D.) bannanus Zhang, Liu & Shi, 2017

2. Mirror present, without chamber in it; middle lobes of epiphallus long..................................................................................................... D. (E.) unguiculatus Ma, Gorochov & Zhang, 2015

- Mirror absent, possessing many cells in mirror; middle lobes of epiphallus short................................... 3

3. Tegmina long, reaching the 8 th abdominal segment........................................................... 8 ................................................................. D. (E.) ziyunensis Zhang, Liu & Shi, 2017

- Tegmina short, away from the 8 th abdominal segment......................................................... 4

4. Lateral lobes of epiphallus without branches................................................................ 5

- Lateral lobes of epiphallus branched...................................................................... 7

5. Head wider than pronotum; tip of epiphallus depressed in ventral view.................................................................................................................... D. (E.) infuscatus Liu & Bi, 2010

- Head almost as wide as pronotum; tip of epiphallus not depressed in ventral view.................................. 6

6. Lateral lobe of epiphallus apically acute in dorsal view...................... D. (E.) hainanensis Liu, He & Ma, 2015

- Lateral lobe of epiphallus apically obtuse and hirsute in dorsal view........... D. (E.) gorochovi Zhang, Liu & Shi, 2017

7. Included angle of branches almost forming a flat angle......................... D. (E.) axinus Zhang, Liu & Shi, 2017

- Included angle of branches almost forming a right angle...................................................... 8 Included angle of branches almost forming an acute angle...................... D. (E.) dendrophilus ( Gorochov, 1988)

8. Posterior lateroabdominal projection of epiphallus long, apically reaching epiphallic lateral lobe branches............................................................................................. D. (E.) obsidianus He, 2019

- Posterior lateroabdominal projection of epiphallus short, apex not reaching upper branch of lateral lobe of epiphallus...................................................................................... D. (E.) longlouensis sp. n.