Scutibracon, Quicke & Walker, 1989

Key to species of the genus Scutibracon View in CoL View at ENA of Vietnam

Remarks. Since species of Scutibracon may be more or less widespread in the Oriental region, it is possible that all of them occur in Vietnam. Therefore, all species of the genus should be listed in this key. Nevertheless, two species, S. gracillariae ( Quicke, 2012) and S. fujianensis Wang & Chen, 2010 , are not included, because their descriptions ( Wang et al. 2010; Quicke et al. 2012) are not enough to distinguish them from S. sumodani .

1. Dorsal carinae of T1 absent ( Fig. 33 View FIGURES 25–36 ). T2 without sublateral carinae, medially 0.95–1.00 × as long as T3 ( Fig. 34 View FIGURES 25–36 ). Median area of T2 parallel-sided, about half as wide as median area of T1 and not reaching hind margin of T2. T3 weakly granulate, without rugae or rugulae.—Vein 3-SR 0.4–0.5 × vein SR1 ( Fig. 31 View FIGURES 25–36 )........... S. storozhenkoi Samartsev, Duong & Long , sp. nov.

- Dorsal carinae of T1 complete ( Figs 10 View FIGURES 1–12 , 21 View FIGURES 13–24 , 47 View FIGURES 37–47 ). T2 with well-developed sublateral carinae, medially 1.2–1.6 × as long as T3 ( Figs 8 View FIGURES 1–12 , 22 View FIGURES 13–24 , 45 View FIGURES 37–47 ). Median area of T2 absent or, if developed, elongate-triangular, much less than 0.5 × as wide as median area of T1. T3 mostly longitudinally rugose, reticulate rugose or rugulose.............................................. 2

2. Median area of T2 absent ( Figs 45, 47 View FIGURES 37–47 ). Posterior margin of T4 with wide protruding lamella ( Figs 45, 46 View FIGURES 37–47 ). Marginal cell of fore wing approaching apex of wing (4.7–6.4 × as long as distance from its apex to apex of wing) ( Fig. 40 View FIGURES 37–47 )................................................................................... S. sumodani (Narendran & Madhavikutty)

- Median area of T2 developed ( Figs 8 View FIGURES 1–12 , 22 View FIGURES 13–24 ). Posterior margin of T4 without protruding lamella ( Fig. 24 View FIGURES 13–24 ). Marginal cell of fore wing reaching apex of wing (10–24 × as long as distance from its apex to apex of wing) ( Fig. 20 View FIGURES 13–24 )..................... 3

3. Mesoscutum medially widely glabrous ( Fig. 19 View FIGURES 13–24 ). Longitudinal diameter of eye 2.2 (male: 3.0 ×) as long as malar space (front view) ( Fig. 14 View FIGURES 13–24 ). Fifth segment of hind tarsus 0.7–0.8 × as long as second segment ( Fig. 17 View FIGURES 13–24 ). Spiracle of T2 located at middle of tergite ( Fig. 22 View FIGURES 13–24 ). Mid-longitudinal keel on propodeum with weakly crenulate margin, in anterior part of propodeum with incomplete crenulate mid-longitudinal impression ( Fig. 22 View FIGURES 13–24 ).............. S. rugosus Samartsev, Duong & Long , sp. nov.

- Mesoscutum medially evenly setose ( Fig. 5 View FIGURES 1–12 ). Longitudinal diameter of eye 2.6–2.7 × as long as malar space (front view) ( Fig. 2 View FIGURES 1–12 ). Fifth segment of hind tarsus 0.9–1.0 × as long as second segment ( Fig. 11 View FIGURES 1–12 ). Spiracle of T2 located in anterior half of tergite ( Fig. 8 View FIGURES 1–12 ). Mid-longitudinal keel on propodeum simple, mid-longitudinal impression absent ( Fig. 7 View FIGURES 1–12 )..................... 4

4. Median area of T2 narrow, somewhat widened anteriorly and posteriorly extending into wide mid-longitudinal keel (occupying less than half of length of T2) ( Fig. 8 View FIGURES 1–12 ). Anterolateral areas of T2 (laterally delineated by sublateral carinae) indistinct, with same sculpture as the rest of T2. Mid-longitudinal keel on propodeum complete ( Fig. 7 View FIGURES 1–12 ). Fore wing vein 3-SR 1.3 × vein 2-SR; vein cu-a postfurcal ( Fig. 9 View FIGURES 1–12 ). OOL 1.9 × OD; POL 1.1 × OD ( Fig. 3 View FIGURES 1–12 )............................ S. hispae ( Viereck, 1913) View in CoL

- Median area of T2 wider, elongate-triangular, not extending into distinct mid-longitudinal keel (Fig. 232 in Samartsev 2023). Anterolateral areas of T2 distinct because of having smoothed sculpture. Mid-longitudinal keel on propodeum incomplete (ibid.). Fore wing vein 3-SR 1.0 × vein 2-SR; vein cu-a interstitial (Fig. 227 in Samartsev 2023). OOL 2.5 × OD; POL 1.4 × OD (Fig. 225 in Samartsev 2023)............................. S. malabaricus ( Narendran, 1994) (Not found in Vietnam)