Euthystiroides heilongjiangensis, Li & Wen & Zhi, 2020

Li, Guochao, Wen, Xiaochen & Zhi, Yongchao, 2020, A new species of the genus Euthystiroides Zhang, Zheng & Ren, 1995 from Heilongjiang, China (Orthoptera, Acridoidea, Acrididae), Zootaxa 4767 (3), pp. 492-494 : 492-494

Euthystiroides heilongjiangensis sp. nov. ( Figs. 1–11 )

Holotype ♂, paratype ♀, Heilongjiang, Mohe, Xingan 53°24`30``- 53°24`35``N, 123°24`35, 2015-6-29, leg. Zhi Yong- Chao & Zhao Xue-Qian.

Male: Body small in size. Head shorter than pronotum distinctly. Face oblique in profile, widened downward gradually. Antennae ensiform, 20 segmented. Eyes oval, vertical diameter 1.4 times horizontal diameter and 1.1 times length of subocular furrow. Pronotum median keel visible, distinctly cut by hind transverse sulcus, lateral keels almost parallel, prozona 1.5 times of metazona in length. Tegmina longer, not reaching the hind margin of third abdominal tergite, length 4.0 times maximum width. Interspace of mesosternum distinctly narrowed in the middle, length 1.9 times minimum width. Lateral lobes of metasternum separated. Upper keel of hind femur smooth, length of hind femur 5.0 times its maximum width, end of lower knee lobes angular, inner side with 78 stridulatory pegs. Hind tibia with 13 spines on inner and on outer sides, external apical spine absent. Third joint of hind tarsus shorter than the first one. Tympanum large and round. Furculae large, apex rounded. Cercus long conical, not reaching tip of epiproct. Subgenital plate long conical. Width of epiphallus almost equal to high, without projection on both inner and outer sides.

Female: Body more robust than male. Vertical diameter of eyes 1.2 times horizontal diameter and equal to subocular furrow. Prozona 1.7 times metazoan in length. Tegmina short, extending over the middle of 2nd abdominal tergite slightly, length 3.5 times its maximum width. Length of hind femur 5.1 times its maximum width, inner side without stridulatory pegs. Cercus short-conical, not reaching end of epiproct. Upper ovipositor valve longer, length 3.9 times maximum width, with small teeth on outer margin.

Coloration: Male body brown. Antennae yellow. Pronotum yellowish-brown. Tegmina of male with a white stripe on the fore margin at base. Tegmina with a black longitudinal stripe in the middle. Subgenital plate brown. Abdomen of female yellowish-brown, with a brown longitudinal stripe on both sides, other as same male.

Measurement (in mm): Length of body: ♂ 19.7, ♀ 24.5. Length of tegmina: ♂ 5.9, ♀ 6.0. Length of hind femur: ♂ 9.8, ♀ 10.2.

Diagnosis. The new species is similar to E. dalianensis Zhang, Zheng & Ren, 1995 . The major differences are listed in Table 1.

Etymology. The specific epithet is named after Heilongjiang the type locality.

The female of E. dalianensis Zhang, Zheng & Ren, 1995 is unknown.

Figures

FIGURES 1–15. Figs. 1–11. Euthystiroides heilongjiangensis sp. nov. 1. Head and pronotum dorsal view ♂; 2. Body in lateral view ♂; 3. Epiphallus; 4. Mesosternum ♂; 5. Tegmen ♂; 6. End of abdomen in dorsal view ♂; 7. Antennae ♀; 8. Body in lateral view ♀; 9. End of abdomen in ventral view ♀; 10. Head frontal view; 11. Mesosternum ♀. Figs. 12–15. E. dalianensis Zhang, Zheng & Ren, 1995 12. Head and pronotum dorsal view ♂; 12. Mesosternum ♂; 13. Epiphallus; 15. Tegmen ♂. (Figs 12–15 after Zhang, Zheng & Ren, 1995).