Trypoxylon, FROM

Pham, Phong Huy, Nguyen, Anh Thi & Antropov, A. V., 2023, New records of species of the genus Trypoxylon Latreille, 1796 (Hymenoptera: Crabronidae) from northern Vietnam, Russian Entomological Journal 32 (1), pp. 58-67 : 60-61

KEY TO THE SPECIES OF TRYPOXYLON FROM NORTHERN VIETNAM

1. Frons with shield ( Figs 7, 10 , 13 ); gaster wholly black ( Figs 19 , 26, 28 ) .......................................................... 2

— Frons without shield ( Figs 1, 3 , 5–6, 8–9 , 11–12, 14–16 ); gaster wholly or partly ferruginous ( Figs 17–18, 20–25, 27, 29–30 ) .................................................................... 4

2. Frontal shield with upper lateral carinae broadly interrupt- ed, dorsal carina distinctly present, lower carina straight ( Fig. 7 ); pronotum undiscoloured posteriorly; body length 12–13 mm (female) ......... T. interruptum Tsuneki, 1978

— Frontal shield with upper lateral carinae uninterrupted, lower carina curved or lightly zigzag ( Figs 10 , 13 ); pronotum discoloured or undiscoloured posteriorly; body length 8–12 mm ............................................................ 3

3. Frontal shield with lower area nearly flat, upper area deeply depressed around fore ocellus ( Fig. 10 ); interantennal transverse carina without hole above ( Fig. 10 ); mesoscutum weakly microcoriaceous; body length 8 mm (female) .............................. T. pileatum F. Smith, 1856

— Frontal shield with lower area conspicuously inclined ( Fig. 13 ); interantennal transverse carina with deep hole above ( Fig. 13 ); mesoscutum fairly and sparsely punctate; body length 11–12 mm (female) .................................... ............................................ T. thaianum Tsuneki, 1961

4. Gaster black with median area (from apex of petiole to gastral segment 3 or from apex of petiole to base of gastral segment 4) ferruginous ( Figs 17, 20 , 22–23 ) ............. 5

— Gaster wholly or from apex of petiole to last gastral segment ferruginous ( Figs 18 , 21, 24 , 25, 27, 29–30 ). ............. 8

5. Clypeus conspicuously protruded mediapically ( Fig. 8 ); gaster from apex of petiole to gastral segment 3 ferruginous lateraldorsally, darkly marked dorsally and ventrally ( Fig. 20 ); legs black ( Fig. 20 ); IODs = 1:1 ( Fig. 8 ); body length 11–14 mm (both female and male) ..................... ........................................... T. orientale Cameron, 1904

— Clypeus round mediapically ( Figs 1, 3 , 11 ); gaster from apex of petiole to base of gastral segment 4 ferruginous ( Figs 17 , 22–23 ); legs black, with ferruginous spots ( Figs 17 , 22–23 ); IODs varied ( Figs 1, 3 , 11 ) ..................... 6

6. SAT with apical margin roundly curved and acutely edged, produced over PAFs; head lightly convergent at lower part (nearly round); IODs = 3:2 ( Fig. 11 ); flagellum black ( Figs 11 , 23 ); body length 12–13 mm (female) ... ........................................... T. prominens Tsuneki, 1979

— SAT without apical margin roundly curved and acutely edged; head conspicuously convergent at lower part; IODs = 5:4 or 4:3 ( Figs 1, 3 ); flagellum brown beneath ( Figs 17 , 22 ); body length 10–19 mm ......................... 7

7. Vertex conspicuously depressed ( Fig. 1 ); anterior margin of clypeus moderately curved ( Fig. 1 ); IODs = 5:4 ( Fig. 1 ); in males, flagellomere 11 in lateral view distinctly tapering ( Fig. 2 ); body length 14–19 mm (both female and male) ...................................... T. bicolor F. Smith, 1856

— Vertex undepressed ( Fig. 3 ); anterior margin of clypeus conspicuously curved ( Fig. 3 ); IODs = 4:3 ( Fig. 1 ); in males, flagellomere 11 in lateral view not tapering, lightly curved medially; body length 9–14 mm (both female and male) ................................ T. petiolatum F. Smith, 1858

8. Gaster wholly ferruginous ( Fig. 27 ); scape, pedicel and base of flagellomere 1 yellowish brown ( Fig. 12 ); body length 11–12 mm (female). T. rufigaster Tsuneki, 1979

— Gaster from apex of petiole to last gastral segment ferruginous ( Figs 18 , 21, 24–25, 29–30 ); scape, pedicel and base of flagellomere 1 black or ferruginous ( Figs 5–6, 9 , 14–16 ) .......................................................................... 9

9. PAF shallow ( Fig. 9 ); IODs = 10:9 ( Fig. 9 ); legs mostly black ( Fig. 21 ); body length 17 mm (female) ................ ................................... T. paeninsulicola Tsuneki, 1979

— PAF deep ( Figs 5–6 , 14–16 ); IODs varied; legs mostly ferruginous or pale brown ( Figs 18 , 24–25, 29–30 ) .. 10

10. IODs = 3:1 ( Fig. 14 ); clypeus distinctly pointed mediapically ( Fig. 14 ); scape and pedicel pale brownish ( Fig. 14 ); body length 9 mm (female) ........ T. tomi Tsuneki, 1979

— IODs varied; clypeus nearly round or largely truncated mediapically; scape and pedicel ferruginous or black ... .................................................................................... 11

11. Anterior oblique flattened area of SAT with distinct hole ( Fig. 16 ); gastral segment 5 and 6 darkly red ( Fig. 30 ); IODs = 5:4 ( Fig. 16 ); body length 10 mm (male) ......... ................................................... T. yumi Tsuneki, 1979

— Anterior oblique flattened area of SAT without hole; gastral segment 5 and 6 ferruginous ( Figs 18 , 24–25 ); IODs = 3:2 or 10:9 ( Figs 5–6 , 15 ) ............................ 12

12. Antennae wholly and legs mostly ferruginous ( Fig. 24 ); ASR roundly inclined to PAF; hairs whitish brassy; body length 13 mm (female) .... T. varipilosum Tsuneki, 1979

— Antennae except scape and pedicel black ( Figs 5–6 ); legs mostly pale brown or ferruginous ( Figs 18 , 25 ); ASR steeply inclined to PAF; hairs silvery ....................... 13

13. Clypeus largely truncated mediapically ( Fig. 5 ); scape and pedicel brownish black; legs largely ferruginous ( Fig. 18 ); IODs = 3:2 ( Fig. 5 ); body length 16 mm (female). ............................................... T. cagrum Tsuneki, 1979

— Clypeus round mediapically ( Fig. 5 ); scape and pedicel ferruginous; legs pale brown to black ( Fig. 25 ); IODs = 5:4 ( Fig. 6 ); body length 9 mm (male) ........................... .......................................... T. fulviventre Tsuneki, 1979

Figures

Figs 5–10. Trypoxylon spp, head in frontal view: 5 — T. cagrum; 6 — T. fulviventre; 7 — T. interruptum; 8 — T. orientale; 9 — T. paeninsulicola; 10 — T. pileatum; 5, 7–10 — females; 6 — male. Рис. 5–10. Trypoxylon spp, голова спереди: 5 — T. cagrum; 6 — T. fulviventre; 7 — T. interruptum; 8 — T. orientale; 9 — T. paeninsulicola; 10 — T. pileatum; 5, 7–10 — самки; 6 — самец.

Figs 11–16. Trypoxylon spp, head in frontal view: 11 — T. prominens; 12 — T. rufigaster; 13 — T. thaianum; 14 — T. tomi; 15 — T. varipilosum; 16 — T. yumi; 11–15 — females; 16 — male. Рис. 11–16. Trypoxylon spp, голова спереди: 11 — T. prominens; 12 — T. rufigaster; 13 — T. thaianum; 14 — T. tomi; 15 — T. varipilosum; 16 — T. yumi; 11–15 — самки; 16 — самец.

Figs 17–20. Trypoxylon spp, female habitus, lateral view: 17 — T. bicolor; 18 — T. cagrum; 19 — T. interruptum; 20 — T. orientale. Рис. 17–20. Trypoxylon spp, внешний вид самки сбоку: 17 — T. bicolor; 18 — T. cagrum; 19 — T. interruptum; 20 — T. orientale.

Figs 25–30. Trypoxylon spp, female habitus, lateral view: 25 — T. fulviventre, male; 26 — T. pileatum, female; 27 — T. rufigaster, female; 28 — T. thaianum, female; 29 — T. tomi, female; 30 — T. yumi, male. Рис. 25–30. Trypoxylon spp, внешний вид самки сбоку: 25 — T. fulviventre, самец; 26 — T. pileatum, самка; 27 — T. rufigaster, самка; 28 — T. thaianum, самка; 29 — T. tomi, самка; 30 — T. yumi, самец.

Figs 1–4. Trypoxylon spp.: 1–2 — T. bicolor; 3–4 — T. petiolatum; 1, 3 — head in frontal view, female; 2, 4 — flagellum, male. Рис. 1–4. Trypoxylon spp.: 1–2 — T. bicolor; 3–4 — T. petiolatum; 1, 3 — голова спереди, самка; 2, 4 — жгутик, самец.

Figs 21–24. Trypoxylon spp, female habitus, lateral view: 21 — T. paeninsulicola; 22 — T. petiolatum; 23 — T. prominens; 24 — T. varipilosum. Рис. 21–24. Trypoxylon spp, внешний вид самки сбоку: 21 — T. paeninsulicola; 22 — T. petiolatum; 23 — T. prominens; 24 — T. varipilosum.