Listrognathus (Listrognathus) octoguttatus, Watanabe, 2025

Key to Japanese species of Listrognathus View in CoL View at ENA

1. Thyridium narrow, about 0.8 × as wide as its distance from base of T II. Clypeus in profile moderately convex, not sharply pyramidical. Posterior transverse carina of propodeum complete medially.

.................................. Subgenus Fenestula Townes, 1962 2 -. Thyridium wide, about 1.3–2.5 × as wide as its distance from base of T II. Clypeus in profile sharply pyramidical or very strongly convex ( Fig. 80B). Posterior transverse carina of propodeum complete, weak, or absent.

............................. Subgenus Listrognathus Tschek, 1871 3 2. Antero-lateral corner of pronotum not produced in dorsal view. Areolet large, its length longer than 0.33 × as long as vein 2m-cu. T II sparsely punctate; ISP distinctly longer than PD. Frons weakly concave. Frontal horn without dorsal tooth in female.

........... Listrognathus (Fenestula) aequabilis Uchida, 1952 View in CoL -. Antero-lateral corner of pronotum produced in dorsal view (weak in male). Areolet small, its length approximately 0.33 × as long as vein 2m-cu. T II densely punctate; ISP as long as PD. Frons strongly concave. Basal part of frontal horn with small dorsal tooth in female.

....... Listrognathus (Fenestula) alticarinatus Momoi, 1966 View in CoL 2. Antero-ventral part of mesopleuron large yellow marking ( Fig. 70A). Posterior margins of T II to T IV each with yellow band ( Figs. 70A, B). Hind tibia bicolour: base and apex black and median part largely reddish-yellow ( Figs. 70A, B). Propodeum with pair of large yellow markings ( Fig. 70E).

...................................... Listrognathus (Listrognathus) yunnanensis He & Chen, 1996 View in CoL -. Antero-ventral part of mesopleuron without yellow marking ( Figs. 67A, F, 68A, 69A, F). Posterior margins of T II to T IV at most narrowly tinged with reddish-brown. Hind femur largely blackish-brown to black ( Figs. 67A, 68A, 69A). Propodeum with ( Figs. 67I, 68E, 69H) or without ( Fig. 69I) pair of yellow markings.

................................................................................................ 3 3. Punctures of T II sharrow and sparse; interspace of punctures distinctly longer than diameter of puncture ( Fig. 67L). T II strongly coriaceous. Large species; body length longer than 8.5 mm (usually longer than 10 mm). Posterior margin of T I sometimes with white band in male. Postero-lateral corner of T II with whitish-yellow markings in male. White band of antenna small; at most three flagellomeres white in female. Posterior transverse carina of propodeum absent medially in female.

.... Listrognathus (Listrognathus) eccopteromus Uchida, 1930 View in CoL -. Punctures of T II deep and dense; interspace of punctures largely distinctly shorter than diameter of puncture ( Fig. 67J). T II weakly coriaceous. Small species; body length sometimes shorter than 8.5 mm. Posterior margin of T I without white band ( Fig. 68B). Postero-lateral corner of T II without whitish-yellow markings in male ( Fig. 68B). White band of antenna large in female; usually more than four flagellomeres white. Posterior transverse carina of propodeum present or absent medially in female.

................................................................................................ 4 4. Posterior transverse carina of propodeum inverted V-shaped; straight between lateral sides and median part; median part of carina sometimes absent ( Figs. 69H, I, 80E). Posterior margins of T IV to T VII each with pair of transverse white markings ( Figs. 69A, B, J). Hind tarsus with white bands on apical half of TS I, TS II, TS III, and TS IV ( Fig. 69A). Hind tibia with large yellowish-brown part subbasally ( Fig. 69A). Scutellum sometimes with yellow spot ( Fig. 69H). Propodeum sometimes with pair of yellow markings ( Fig. 69H). Ovipositor sheath 0.65–0.7 × as long as hind tibia. T V and T VI with white marking(s) ( Figs. 69A, B, J). Fore wing without clouded area ( Figs. 69A, G). Male unknown.

.......... Listrognathus (Listrognathus) octoguttatus sp. nov. -. Posterior transverse carina of propodeum inverted wide U-shaped; sinuate between lateral sides and median part; median part of carina complete ( Figs. 67I, 68E, 80D). Posterior margins of T IV and T VII black in female ( Figs. 67B, K). Posterior margins of T V and T VI, if with white markings, tergite(s) (each) with single median white marking in female ( Figs. 67B, K). Posterior margins of T IV to T VII each with single median white marking in male ( Figs. 68A, B). Other character states various.

................................................................................................ 5 5. Hind tibia with small white marking at subbasal part; it sometimes reduced ( Figs. 67A, B, 68A, B). T V and T VI each with single median white marking in female ( Figs. 67B, K). T IV to T VII each with single median white marking in male ( Figs. 68A, B). Base of hind TS I usually narrowly white ( Fig. 68A). Fore wing usually with clouded area in female ( Figs. 67A, B, G, H) (this area sometimes indistinct as in Fig. 67H). Scutellum sometimes with yellow spot ( Fig. 67I; sometimes scutellum entirely yellow). Propodeum sometimes with pair of yellow markings ( Figs. 67I, 68E).

............................................... Listrognathus (Listrognathus) coreensis coreensis Uchida, 1930 View in CoL -. Hind tibia yellowish-brown except for blackish-brown apical part. T IV to T VII without white marking. Fore wing without clouded area. Scutellum and propodeum entirely black.

..... Listrognathus (Listrognathus) punctator ( Smith, 1874) View in CoL