1.	Fore tarsal claws bifurcate, the inner tooth usually large and with no lobe (a); outer face of middle tibia without submedial pegs (b), but with one peg in Coronagathis; area between antennal sockets with a pair of crests or carinae (c), less frequently (about 30 %) with a trough (cc) or tubercle	2
–	Fore tarsal claws simple or with a more or less lamelliform, basal lobe (aa); outer face of middle tibia with pegs submedially or pegs in a subapical cluster (bb); area between antennal sockets usually with a simple median elevation or with a trough (cc)	13
2.	Notauli completely absent and area smooth (a); gena more or less protruding postero-ventrally (b); inner tooth of bifurcate fore claws larger than its outer tooth (female) or teeth equal (male) (c)	3
–	Notauli at least in anterior half of mesoscutum impressed (aa), if shallowly impressed then area distinctly sculptured; gena variable postero-ventrally (bb); inner tooth of bifurcate fore claws as large as its outer tooth or smaller (both sexes; cc)	4
3.	Outer ventral margin of hind trochantellus with a carina (a) and basally angulate; ovipositor sheath short, about as long as apical height of metasoma; vein 2r-m of hind wing absent (b); [scutellum with subposterior elevation (but sometimes reduced); epomial carinae double or single; semi-circular crest present behind antennal sockets; vein SR1 of fore wing rather curved]	Gyrochus Enderlein, 1920
–	Outer ventral margin of hind trochantellus without carina (aa) and not or only slightly angulate basally; ovipositor sheath long, about as long as fore wing or somewhat shorter; vein 2r-m of hind wing indicated (bb)	Biroia Szépligeti, 1900
4.	Inner spur of middle tibia 0.8–1.1 times as long as middle basitarsus (a); apex of antenna with short to medium-sized spine (b), sometimes minute; ovipositor sheath short, about as long as apical height of metasoma, hardly or not protruding; hind trochantellus usually with a distinct ventral carina on its outer edge (c) or edge distinctly angulate; [apex of the ovipositor sheath blunt apically and with numerous ampulliform papillae]; Coccygidium complex	5
–	Inner spur of middle tibia 0.4–0.7 times as long as middle basitarsus (aa); apex of antenna without spine (bb); relative length of ovipositor sheath vari able; ventral carina of hind trochantellus often (about two-thirds) absent or obsolescent (cc)	7
5.	Malar suture long and deep (a); outer and inner side of antennal socket strongly protruding (b); eye with distinct subocular groove posteriorly (c); [hind coxa much longer than first tergite; not yet found but may occur in South Vietnam]	Hypsostypos Baltazar, 1963
–	Malar suture absent (aa); outer side of antennal socket weakly protruding (bb), eye without subocular groove posteriorly (cc)	6
6.	Fore tibial spur with a long curved and glabrous apical spine (a); malar space rugulose (b); notauli comparatively wide (c); hind coxa with longitudinal carina or rugae (d); frons with lateral crests or carinae more or less developed (e)	Coccygidium de Saussure, 1892
–	Fore tibial spur with a short, straight and setose apex (aa); malar space smooth or punctate (bb); notauli comparatively narrow (cc); hind coxa without longitudinal carina or rugae (dd); frons without lateral crests or carinae (ee); [area between antennal sockets without a pair of carinae; temples medium-sized; ventral surface of hind femur densely rugose]	Zelodia gen. n.
7.	Inner or outer hind claw with a distinct wide and acute lobe submedially or a wide dark obtuse submedial lamella (a); if rather narrow then about as long as apical tooth; outer aspect of scapus partly smooth and somewhat concave (b); ovipositor sheath slender and much longer than apical height of metasoma (c); [frons without a pair of lamellae between antennal sockets]	8
–	Inner and outer hind claw bifurcate, with a small subapical inner tooth or (nearly) simple (aa); if with a rather flattened inner tooth then this distinctly shorter than apical tooth; outer aspect of scapus punctate or punctulate and usually less concave (bb); ovipositor sheath more or less widened and short, about as long as apical height of metasoma or less (cc)	9
8.	Outer hind tarsal claw with a distinct lobe similar to lobe of inner hind tarsal claw and no pecten (a); area near inner side of antennal sockets shallowly depressed (b); mesosternal sulcus deep and coarsely crenulate; hind trochantellus more or less carinate ventrally (c; but may be rounded or nearly so); at least posterior half of precoxal sulcus distinctly crenulate (d); [not yet found but likely to occur in North Vietnam]	Cremnoptoides van Achterberg & Chen, 2004
–	Outer hind tarsal claw with a dentiform or squarish black lamella and more or less with a black pecten basally and different from lobed inner claw (aa); area near inner side of antennal sockets deeply depressed (bb); mesosternal sulcus shallow and smooth or nearly so; hind trochantellus rounded ventrally (cc); precoxal sulcus absent or nearly so (dd)	Cremnops Foerster, 1862
9.	Scutellum with a pair of large horns and axillae protruding (a); subbasal cell of hind wing narrower than plical lobe (b); hind coxa long, exceeding length of first tergite and coarsely sculptured (c)	Coronagathis gen. n.
–	Scutellum without a pair of tubercles (aa); subbasal cell of hind wing about as wide as plical lobe (bb); hind coxa shorter, at most as long as first tergite (cc), if rarely somewhat longer than coxa largely smooth	10
10.	Frons without lateral carinae (a); vein M+CU of hind wing at most 0.8 times vein 1-M (b); labio-maxillary complex only slightly protruding (c)	Euagathis Szépligeti, 1900
–	Frons with lateral carinae (aa); vein M+CU of hind wing longer than vein 1-M or subequal (up to 0.9 times; bb); labio-maxillary complex usually rather protruding (cc, but not in Oreba)	11
11.	First subdiscal cell of fore wing distinctly higher than first discal cell (a); body metallic; marginal cell of hind wing ends in front of wing apex (b); vein m-cu of fore wing subparallel to vein 1-M (c); area between antennal sockets with an obtuse tubercle (d); [outer ventral margin of hind trochantellus cariniform; only the North Oriental type species (Oreba purpurea Cameron, 1900) is known; not yet found in Vietnam but may occur in the northern mountains]	Oreba Cameron, 1900
–	First subdiscal cell of fore wing lower than first discal cell (aa; Disophrys) or subequal (aaa; Troticus); body non-metallic; marginal cell of hind wing close to wing apex (bb); vein m-cu of fore wing diverging from vein 1-M (c); area between antennal sockets with a pair of carinae or crests (dd)	12
12.	Prepectal carina distinctly angulate subdorsally (a); lateral carina of frons pointing to anterior ocellus or between anterior and posterior ocelli (b); scapus robust compared to third antennal segment and straight (c); [hind trochantellus rounded ventrally]	Troticus Brullé, 1846
–	Prepectal carina evenly curved subdorsally (aa); lateral carina of frons pointing to posterior ocellus (bb); scapus less robust compared to third antennal segment and more or less bent (cc)	Disophrys Foerster, 1862
13.	Veins of fore wing largely absent (a); hind trochantellus much longer than trochanter (b); hind tibia with blackish bristles (c); pedicellus enlarged (d); [not yet found in Vietnam, but expected to occur]	Aneurobracon Brues, 1930
–	Veins of fore wing largely present (aa); hind trochantellus about as long as trochanter or shorter (bb); hind tibia without black bristles (cc); pedicellus short (dd)	14
14.	Vertical axis [v] of malar triangle 1.7–6.0 times its horizontal axis [h] and the part of head below eyes only gradually narrowed ventrally (a) to parallel-sided; clypeus strongly convex (b); mouth-parts more or less lengthened in form of a beak, galea nearly always distinctly longer than 1.3 times its width, longer than labial palp (c); [mainly Holarctic, but some species reach the northern Oriental region]	Agathis Latreille, 1804
–	Vertical axis [v] of malar triangle 1.0–1.5 times its horizontal axis [h] and the part of head below eyes directly narrowed ventrally (aa); clypeus usually at least partly flattened (bb), only in Therophilus mediator-group distinctly convex (bbb); mouth-parts normal, galea not longer than wide, shorter than labial palp and usually hardly or not visible in lateral view (cc)	15
15.	Fore and middle tarsal claws simple and comparatively robust (a); area behind antennal sockets deeply impressed (b); [vein 1-M of hind wing 1.1–1.6 times as long as vein M+CU]	Bassus Fabricius, 1804 s.s.
–	Fore and middle tarsal claws nearly always with a distinct basal lobe and comparatively slender (aa); area behind antennal sockets nearly always moderately to shallowly impressed (bb); [vein 1-M of hind wing 0.6–1.4 times as long as vein M+CU]	16
16.	Vein 1-SR+M of fore wing more or less developed (a), usually sclerotised medially, but sometimes only as a brownish pigmented stripe and notauli absent (but mesoscutum medio-posteriorly with a deep to superficial depression; b)	Earinus Wesmael, 1837
–	Vein 1-SR+M of fore wing medially absent, not sclerotised and usually without pigmentation (aa), if pigmented then notauli complete (bb)	17
17.	Antennal sockets with a circular carina reaching dorsally as high as level of anterior ocellus (a); temples with a lateral tubercle (b); genal protuberance present and protruding ventrally (c); scutellum with a distinct subposterior crest (d) and medio-posterior depression transverse (e); [transverse metasternal carina non-lamelliform and beyond upper level of hind coxal cavities]	Gyragathis gen. n.
–	Antennal sockets without a circular carina (aa); temples without a lateral tubercle (bb); protuberance absent (cc), if present then protruding posteriorly; scutellum without a distinct subposterior crest (dd) and transverse medio-posterior depression absent, obsolescent or semicircular (ee)	18
18.	Outer side of antennal sockets distinctly lamelliform protruding in dorsal view (a); subpronope deep, wide and epomia strongly developed (b); basal half of third metasomal tergite usually with sharp lateral margin (c); dorsal carinae of first tergite usually long and costate (d); propodeal spiracle comparatively large and elliptical (e); ramellus of fore wing usually present (f); [transverse metasternal carina lamelliform; no subposterior crest of scutellum]	Braunsia Kriechbaumer, 1894
–	Outer side of antennal sockets not or only slightly protruding in dorsal view (aa), sometimes as a narrow lamella; subpronope comparatively shallow and epomia medium-sized to weakly developed (bb); basal half of third tergite often without sharp lateral margin or weakly developed (cc), except in Lytopylus; dorsal carinae of first tergite usually weakly developed (dd) or absent; propodeal spiracle medium-sized to small, round or sub-elliptical (ee); ramellus of fore wing absent (ff)	19
19.	Vein r-m of fore wing absent (a); first metasomal tergite and often also metapleuron granulate and dull and tergite distinctly convex medially and dorsal carinae absent (b); precoxal sulcus about 0.6 times as long as mesopleuron and sculptured (c) or superficially impressed and smooth	Camptothlipsis Enderlein, 1920
–	Vein r-m of fore wing present (aa), rarely obsolescent; sculpture of first tergite and metapleuron variable (bb), if granulate then first tergite less convex medially and with dorsal carinae (bbb); precoxal sulcus longer than 0.6 times length of mesopleuron and sculptured (cc) or absent	20
20.	First metasomal tergite 5–6 times as long as wide apically (a) and 1.6–1.7 times as long as hind coxa (b); frons flattened anteriorly except for a short median depression (c); hind femur short compared to hind coxa (d); hind basitarsus with numerous spiny setae ventrally (e); [not yet found in Vietnam but expected to occur; synonymised with Lytopylus Foerster by Sharkey et al. (2009), but it runs in their key to Therophilus Wesmael. Provisionally retained as separate genus because of the synapomorphous character states (a-d) listed above]	Facilagathis van Achterberg & Chen, 2004
–	First tergite 1–3 times as long as wide apically (aa) and about as long as hind coxa (bb); frons partly convex anteriorly and behind antennal sockets concave (cc); hind femur longer compared to hind coxa (dd); hind basitarsus only bristly setae ventrally (ee)	21
21.	Metasomal cavity [mc] at most reaching upper level of hind coxal cavities [hcc] (a); transverse metasternal carina [tmc] (= carina behind metasomal cavity) straight or nearly so and coarsely developed (b); anterior half of third metasomal tergite often more or less coarsely striate (c), but sometimes smooth	Lytopylus Foerster, 1862
–	Metasomal cavity [mc] protruding beyond upper level of hind coxal cavities [hcc] (aa); transverse metasternal carina [tmc] curved and less developed (bb); sculpture of anterior half of third tergite variable, usually smooth or finely striate (cc)	Therophilus Wesmael, 1837