1.
Metasomal tergites all black (A); length of 2nd metasomal tergite >
1.25X posterior width (B) ...
Bacuma bicolor
Metasomal
tergites 1-4 red (a) or ochreous (b), tergites 5 and 6 red or
ochreous but black in B. fumipennis; 2nd metasomal tergite
variable ... 2
2.
Mid-basal triangular area of 2nd tergite largely or entirely smooth
(A); 2nd metasomal tergite 1.0-1.1 x longer than wide (A); depressed
part of frons black, lateral parts orange-red or yellowish-orange
(B); metasomal sternites and hypopygium largely piceous; base of
hind wing with a large glabrous area (C) ... 3
Mid-basal
triangular area of 2nd tergite entirely striate (a); 2nd metasomal
tergite variable (a); lateral parts of frons often largely or
entirely black (b); metasomal sternites and hypopygium variable;
base of hind wing usually with a narrow glabrous area adjacent to
vein cu-a (c) ... 5
3. Basal
half of fore wing including most of subbasal cell dark brown (A);
occiput broadly black (B); hind wing largely dark brown except for
small hyaline areas around basal cell and apex of 1-M (A) ...
Bacuma maculiventris
Basal half
of fore wing including most of subbasal cell hyaline (a); occiput
with narrow median black bar (b); hind wing with more extensive pale
markings ... 4
4.
Metasomal tergites ochreous orange-red to red with posteriorly-converging
sublateral carinae of 2nd metasomal tergite not conspicuously darker
(A); top of head broadly black (B); head, pronotum and mesopleuron
without white colouration (C); mesosternum entirely red; hind leg
entirely orange-red (C) ...
Bacuma darfurensis
Metasomal
tergites ochreous yellow with posteriorly-converging sublateral
carinae of 2nd metasomal tergite dark brown (a); top of head with a
narrow black line and whitish anteriorly (b); pronotum, anterior of
mesopleuron whitish (c); mesosternum and mesopleuron with dark marks
(c); hind leg beyond coxa largely black (c) ...
Bacuma kayserae
5.
Mesosoma and metasomal tergites 5-7 largely black (A), hind femur
and tibia, except at their junction, dark brown (A); hind wing
largely hyaline with dark brown patches antero-basally and antero-medially
(A); sculpture of 2nd metasomal tergite behind triangular area
coarse (B); body length 11 mm ...
Bacuma fumipennis
Mesosoma
and metasomal tergites 5-7 red (a), hind femur and tibia red (a);
hind wing largely dark brown (b); sculpture of 2nd metasomal tergite
behind triangular area fine (b); body length > 18 mm ... 6
6. Body
ochreous yellow (A); posterior margin of propodeum (anterior of
lunule) crenulate (B); frons gradually impressed behind antennal
sockets, the part lateral to the depression with same sculpture as
impressed part except immediately behind antennal sockets (C) ...
Bacuma madiensis
Body red
(a); posterior margin of propodeum (anterior of lunule) smooth (b);
frons more abruptly impressed behind antennal sockets and part
lateral to depression markedly more coarsely sculptured (c) ... 7
7.
Mesonotum entirely red (A, B) ...
Bacuma maculipennis &
Bacuma rufa
Mesonotum
largely piceous (a, b) ...
Bacuma granulatus &
Bacuma whitei
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