Jucancistrocerus, Bluthgen, 1938

Li, Ting-Jing, Bai, Yue & Chen, Bin, 2022, A revision of the genus Jucancistrocerus Blüthgen, 1938 from China, with review of three related genera (Hymenoptera: Vespidae: Eumeninae), Zootaxa 5105 (3), pp. 401-420 : 402-403

Key to the species of Jucancistrocerus and the related genera from China

1. Pretegular keel absent on the pronotum.................................................................... 2

- Pretegular keel present and developed on the pronotum....................................................... 8

2. Tegula inconspicuously, finely and superficially punctate, usually with only two larger translucent spots ( Fig. 70 )............................................... Eustenancistrocerus (Parastenancistrocerus) amadanensis ( de Saussure, 1855)

- Tegula with dense, strong, sieve-like translucent punctures ( Figs 13 , 51 , 60)....................................... 3

3. T1 short and distinctly wider than long; transverse edge of T1 lying on the level of horizontal area approximately in the middle of this tergum ( Fig. 60 )................. Eustenancistrocerus (Eustenancistrocerus) askhabadensis ( Radoszkowski, 1886)

- T1 elongate and slightly wider than long, or if distinctly wider than long, dorsal surface of propodeum posteriorly with one supercarina extending to lateral side ( Figs 5 , 14); transverse edge of T1 lower than the horizontal surface and closer to the base of this tergum ( Figs 8 , 15, 22 , 37, 52 )............................................... Jucancistrocerus Blüthgen 4

4. Clypeus shallowly emarginated at apex ( Figs 3–4 , 11); T1 much wider than long and somewhat narrower than (more than 0.8×) T2 ( Figs 8 , 15)....................................................................................... 5

- Clypeus more deeply emarginated at apex, and tooth-like laterally ( Figs 19–20 , 34–35, 45–46, 49–50 ); T1 elongate, a little wider than long and distinctly narrower than (less than 0.8×) T2 ( Figs 22 , 37, 52 ).................................. 6

5. Body more coarsely punctate ( Figs 1–4, 8–9 ); apical margin of clypeus emarginated and incised ( Figs 3–4 ); mesoscutum without or with one smaller subapical spot ( Figs 1–2 )..................... J. (Eremodynerus) atrofasciatus ( Morawitz, 1885)

- Body less sparsely punctate ( Figs 10–12, 15–16 ); apical margin of clypeus slightly emarginated; mesoscutum medially with one big subapical spot ( Fig. 10 ).............................................. J. (E.) chotanensis ( Blüthgen, 1942)

6. Clypeus coarsely punctate in both sexes, and apex relatively narrower (in female apical width: depth of emargination= 2.89, in male apical width: depth of emargination=2.57) ( Figs 49–50 ).......... J. (Jucancistrocerus) tachkensis ( Dalla Torre, 1889)

- Clypeus less sparsely punctate, and apex wider (in female apical width: depth of emargination=3.32–3.96, in male apical width: depth of emargination=1.99–2.25) ( Figs 19–20 , 30–31, 34–35, 45–46)........................................... 7

7. Both female and male clypeus widely and shallowly emarginated at apex ( Figs 34–35 , 45–46); male A13 hooked backward not reaching the base of A11 ( Fig. 39 ); volsella ( Fig. 40 ) apically narrower and sharper..... J. (J.) angustifrons ( Kostylev, 1940)

- Both female and male clypeus more narrowly and deeply emarginated at apex ( Figs 19–20 , 30–31); male A13 hooked backward extending to the base of A11 ( Fig. 24 ); volsella ( Fig. 25 ) apically wider and blunter...... J. (J.) alashanicus Kurzenko, 1977

8. Transverse edge of T1 lying below the level of horizontal surface of this tergum ( Fig. 88 ); T3 much coarser in the distal portion than at the base of T2 ( Fig. 89 ); clypeus truncate and narrow at apex (83–84)...................................................................................................... Tachyancistrocerus schmidti (Kokujev, 1912)

- Transverse edge of T1 lying at the level of the horizontal surface ( Fig. 77 ); punctures on T3 not coarser than those of T2 ( Fig. 79 ); clypeus deeply and widely emarginted at apex ( Fig. 74 )............................................................................................. Stenancistrocerus (Paratropancistrocerus) transcaspicus (Kostylev, 1934)

Figures

FIGURES 65–72. Eustenancistrocerus (Parastenancistrocerus) amadanensis amadanensis, 65, 67, 69–72, ♀; 66, 68, ♂. 65– 66. Habitus, dorsal view; 67–68. Head, frontal view; 69. Vertex and pronotal carina, frontal view; 70. Tegula; 71. Metasoma, dorsal view; 72. Metasoma, ventral view.

FIGURES 10–16. Jucancistrocerus (Eremodynerus) chotanensis, ♀. 10. Habitus, dorsal view; 11. Head, frontal view; 12. Vertex and pronotal carina, frontal view; 13. Tegula, dorsal view; 14. Propodeum, dorsal view; 15. Metasoma, dorsal view; 16. Metasoma, ventral view.

FIGURES 47–55. Jucancistrocerus (Jucancistrocerus) tachkensis, 47, 49, 51–53, ♀; 48, 50, 54–55, ♂. 47–48. Habitus, dorsal view; 49–50. Head, frontal view; 51. Tegula; 52. Metasoma, dorsal view; 53. Metasoma, ventral view; 54. Antenna; 55. Genitalia, lateral view.

FIGURES 56–64. Eustenancistrocerus (Eustenancistrocerus) askhabadensis, ♂. 56. Habitus, dorsal view; 57. Head, frontal view; 58. Vertex and pronotal carina, frontal view; 59. T1, dorsal view; 60. Tegula, dorsal view; 61. Propodeum, dorsal view; 62. Metasoma, dorsal view; 63. Metasoma, ventral view; 64. Antenna.

FIGURES 1–9. Jucancistrocerus (Eremodynerus) atrofasciatus, 1, 3, 5–6, 8–9, ♀; 2, 4, 7, ♂. 1–2. Habitus, dorsal view; 3–4. Head, frontal view; 5. Propodeum, dorsal view; 6. Vertex and pronotal carina, frontal view; 7. Antenna; 8. Metasoma, dorsal view; 9. Metasoma, ventral view.

FIGURES 17–25. Jucancistrocerus (Jucancistrocerus) alashanicus, 17, 19, 21–23, ♀; 18, 20, 24–25, ♂. 17–18. Habitus, dorsal view; 19–20. Head, frontal view; 21. Propodeum, dorsal view; 22. Metasoma, dorsal view; 23. Metasoma, ventral view; 24. Antenna; 25. Genitalia, lateral view.

FIGURES 32–40. Jucancistrocerus (Jucancistrocerus) angustifrons, 32, 34, 36–38, ♀; 33, 35, 39–40, ♂. 32–33. Habitus, dor- sal view; 34–35. Head, frontal view; 36. Propodeum, dorsal view; 37. Metasoma, dorsal view; 38. Metasoma, ventral view; 39. Antenna; 40. Genitalia, lateral view.

FIGURES 81–89. Tachyancistrocerus schmidti, 81, 83, 85–89, ♀; 82, 84, ♂. 81–82. Habitus, dorsal view; 83–84. Head, frontal view; 85. Vertex and pronotum, lateral view; 86. Tegula; 87. Propodeum, dorsal view; 88. T1, dorsal view; 89. T2–T6, ventral view.

FIGURES 73–80. Stenancistrocerus (Paratropancistrocerus) transcaspicus, ♀. 73. Habitus, dorsal view; 74. Head, frontal view; 75. Head and pronotal carina, frontal view; 76. Tegula, dorsal view; 77. T1, dorsal view; 78. Propodeum, dorsal view; 79. T2–T6, dorsal view; 80. S2–S6, ventral view.