 
1. Face with distinct
interantennal tooth (fig a) ... 2
-
Face without interantennal tooth (fig. a)
... 3
2. Metasoma
posteriorly conical, dorsally with distinct saddle-like depression at
base of fourth tergite
(figs. a) Pakistan,
India, Thailand
... Buresium naso
-
Metasoma less acuminate, dorsal depression
almost absent (figs. a & b) South Africa
...
Buresium species
3.
Pronotal shoulders in dorsal
view rounded (fig a). female second funicular segment up to 1.4X as long
as broad, but slightly longer than pedicel. Male flagellum combined with
pedicel 2.6-2.9X as long as head is broad
Mediterranean to central Asia
...
Buresium rufum
-
Collar with more distinct shoulders,
laterally edged (fig
a). Antennae generally longer than in Bupresium rufum.
African
...4
4. Funnel-like depression on
pronotal side broad, without flap (fig a). Scutellum with
regular reticulation. Stigmal vein almost gradually curved. Flagellum with
pedicel combined less than 1.3X (female) or 3.6-3.7X (male) as long as
head is broad South
Africa ...Buresium tenue
-
Side depression on pronotum narrow and
covered by a flap from anterior edge (fig a). Anterior half of scutellum
dull due to sharp deep reticulation, hind half shiny. Stigmal vein
strongly elbowed in proximal third. Flagellum plus pedicel 1.4X (female)
as long as head is broad. Male unknown
Zimbabwe
... Buresium watshami
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