| 1 | | | Hind margin of head straight or weakly concave, without medial groove (Figs 59, 72, 91, 114); occipital carina not interrupted (Figs 59, 72, 91, 114) | | | 2 |
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| – | | | Hind margin of head more or less grooved medially (Figs 16, 27, 39, 48, 79, 103); occipital carina interrupted (Figs 16, 27, 39, 48, 79, 103) | | | 12 |
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| 2 | | | |
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| – | | | Lateroventral margin of pronotum at least with one tooth-like process (Figs 19, 30, 42, 51, 62, 73, 82, 94, 104, 117) | | | 3 |
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| 3 | | | |
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| – | | | Hind basitarsus at most 1.3 × longer than tarsomeres 2–5 | | | 4 |
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| 4 | | | Occipital carina wide, 0.5 × diameter of ocellus, lamelliform, brownish | | | 5 |
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| – | | | Occipital carina at most 0.2 × diameter of ocellus, pad-shaped, blackish | | | 7 |
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| 5 | | | Large sized species (body length, excluding ovipositor about 15.0 mm); basal antennomeres very elongate (A3 8.3 × longer than wide, A4 14.0 × longer than wide) | | | Pristaulacus longicornis Kieffer |
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| – | | | Medium sized species (body length, excluding ovipositor about 10.0-11.0 mm); basal antennomeres elongate (A3 5.0–6.0 × longer than wide, A4 10.0 × longer than wide) (Fig. 67) | | | 6 |
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| 6 | | | |
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| 7 | | | |
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| – | | | Hind coxa transverse-carinate or rugose | | | 8 |
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| 8 | | | |
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| – | | | Hind coxa transverse-carinate | | | 9 |
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| 9 | | | |
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| – | | | Forewing with vein 2-rs+m long, cells SM2 and D1 distinctly separated (Figs 95, 118) | | | 10 |
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| 10 | | | |
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| – | | | Metasoma at least with first tergite brown (Figs 65, 121); hind tarsus yellowish-brown (Figs 56, 111) | | | 11 |
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| 11 | | | Frons with yellow areas around antennae (Fig. 58); propleuron largely finely rugose with small smooth area posterodorsally (Fig. 60) | | | Pristaulacus fopingi sp. n. |
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| – | | | Frons entirely black (Fig. 113); propleuron densely punctate ventrally, finely rugose with small smooth area dorsally (Fig. 115) | | | Pristaulacus rufobalteatus Cameron |
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| 12 | | | Pronotum, in lateral view, with two projecting tooth-like processes, one anteroventral, the other ventral; pretarsal claw with six tooth-like processes | | | 13 |
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| – | | | Pronotum with one anteroventrally projecting tooth-like process; pretarsal claw with four or five tooth-like processes | | | 16 |
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| 13 | | | |
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| – | | | Occipital groove shallow, less deep than wide (Fig. 103) | | | 14 |
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| 14 | | | |
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| – | | | Ovipositor 0.8–0.9 × forewing length | | | 15 |
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| 15 | | | Forewing with vein 2-rs+m short, cells SM2 and D1 slightly separated; propleuron dull, finely rugose with small smooth area dorsally | | | Pristaulacus iosephi Turrisi & Madl |
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| – | | | Forewing with vein 2-rs+m long, cells SM2 and D1 distantly separated (Fig. 107); propleuron shiny, largely smooth with sparse fine punctures (Fig. 104) | | | Pristaulacus pseudoiosephi sp. n. |
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| 16 | | | Occipital carina not interrupted along occipital medial groove (Fig. 49); occipital medial groove V-shaped, its depth very shallow (Fig. 49) | | | Pristaulacus excisus Turner |
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| – | | | Occipital carina interrupted along occipital medial groove; occipital medial groove abruptly shaped, from narrow to wide and deep (Figs 27, 39) | | | 17 |
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| 17 | | | |
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| – | | | Forewing with only one brown spot below stigma | | | 18 |
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| 18 | | | |
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| – | | | Mesoscutum mostly transverse-carinate (Figs 18, 29) | | | 19 |
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| 19 | | | Setae on body golden brown (Fig. 24); punctures on frons deep and dense, distance between punctures 0.5–1.0 × diameter of a puncture (Fig. 26) | | | Pristaulacus centralis sp. n. |
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| – | | | Setae on body white (Fig. 13); punctures on frons deep and scattered, distance between punctures 2.0–3.0 × diameter of a puncture (Fig. 15) | | | Pristaulacus calidus sp. n. |
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