Hemigyrus, Brunner von Wattenwyl, 1893

Xie, Hui-Cong, Wang, Han-Qiang, Zong, Jing-Song, Li, Kai & He, Zhu-Qing, 2022, Taxonomic revision of the genus Hemigyrus Brunner von Wattenwyl, 1893 (Orthoptera: Tettigoniidae: Pseudophyllinae), Zootaxa 5092 (1), pp. 97-115 : 101-102

Key to species of Hemigyrus

1. Prosternum with a pair of spines ( Fig. 4A ). Distal part of tegmina rather pointed ( Figs. 5A–H ). [subgenus Hemigyrus (弧ffȃ 亚Dz)].............................................................................................. 2

- Prosternum without a pair of spines ( Fig. 4B ). Distal part of tegmina truncated ( Figs. 5I–N ). [subgenus Tomomima (ẘȃ亚 Dz)]................................................................................................ 6

2. Distal half of tegminal edge strongly curved. Spines of hind legs greenish.............. H. (H.) annamensis (Ṗ南弧ffȃ)

- Distal half of tegminal edge moderately curved. Spines of hind legs reddish or greenish............................. 3

3. Upper edge of pronotum distinctly arched in profile. Fore femora with outer spines on lower side. Lower outer and upper median spines on hind femora red at basal part and black in terminal................ … H. (H.) tonkinensis (N北弧ffȃ)

- Upper edge of pronotum hardly arched in profile. No outer spines on fore femora ventrally. Spines on hind femora monochrome......................................................................................... 4

4. The apex of tegmina somewhat protruded and in sharply acute angle ( Figs. 5E, F )......... H. (H.) acutifolius (尖叶弧ffȃ)

- The apex of tegmina in obtusely acute angle ( Figs. 5C, D, G, H )................................................ 5

5. Body smaller (length of male tegmina 25.5–27.7mm)..................................... H. (H.) minor (小弧ffȃ)

- Body larger (length of male tegmina 32.9–36.1mm)..................................... H. (H.) amplus (k弧ffȃ)

6. Size larger. Tubercles and rear transverse furrow on pronotum distinct. China: Hainan ............. H. (T.) major (kẘȃ)

- Size smaller. Tubercles and rear transverse furrow on pronotum indistinct......................................... 7

7. Stridulatory vein of male upper tegmen slightly shorter than proximal cell between M and CuA. Distal half of ovipositor much narrower.......................................................................... H. (T.) sonorus (Ḃẘȃ)

- Stridulatory vein of male upper tegmen distinctly shorter than proximal cell between M and CuA. Distal half of ovipositor much wider............................................................................................... 8

8. Size smaller. Length of male tegmina 30.3–34.3mm, female 40.0– 43.2mm.… H. (T.) spinosus spinosus (OiflẘȃDzZ亚ẽ)

- Size larger. Length of male tegmina 35.8–36.2mm, female 47.9mm H. (T.) spinosus robustus subsp. nov. (Oiflẘȃffi亚ẽ)

Figures

FIGURE 4. The comparison of characteristics of Hemigyrus. A. prosternum with thorns; B. prosternum without thorns; C. color of the fore femora and middle femora ventrally in H. (T.) spinosus; D. color of the fore femora and middle femora ventrally in H. (H.) amplus. Scale bar= 2mm.

FIGURE 5. The tegmina of Hemigyrus spp. A, B. H. (H.) tonkinensis; C, D. H. (H.) amplus; E, F. H. (H.) acutifolius; G, H. H. (H.) minor; I, J. H. (T.) spinosus robustus subsp. nov.; K, L. H. (T.) spinosus spinosus; M, N. H. (T.) major. A, C, E, G, I, K, M. male; B, D, F, H, J, L, N. female. Scale bar= 10mm.