272 
G.R. Brown 
Figures 7-10 Macrothynnus spp., female, apex of metasoma, posterior view: 7, M. itisignis (Smith); 8, M. molitor 
(Smith); 9, M. mustus sp.nov.; 10, M. watherooensis sp.nov. A: S5; B: T6 (pygidium); C: T5. Scales: 1 mm. 
Diagnosis 
Large elongate black or almost black wasps with 
the clypeus yellow and the metasoma yellow or 
reddish orange in the male, and the pleurites and 
anterior margin of tergites yellow in the female. 
The male is distinguished by the parameres (Figure 
5) which are long, narrow and apically truncate, 
and is separated from M. watherooensis by the 
presence of a reddish orange spot behind the eye 
(rather than at the summit of the eye). The female 
is distinguished from all other species by only the 
pleurites and anterior margin of the tergites 
yellow, and the pygidium (Figure 9) narrowed 
medially. 
Description Male 
Length 
Body: 30-31 mm; fore wing: 26-27 mm; hind 
wing: 16-17 mm. 
Colour 
Black; mandibles (except apex), clypeus bright 
yellow; small obscure spot behind eye and 
metasoma reddish orange (metasoma rarely 
yellow). Wings suffused with orange especially on 
costal and cubital margins of fore wing becoming 
infuscate distally; veins yellow, brown and black. 
Setae white becoming pale yellow towards apex of 
metasoma. 
Structural features 
Clypeus truncate with rugose curved carinae; 
frons, vertex and gena finely and rugosely 
punctate; antennal prominence broadly U-shaped, 
raised and carinate above antennal insertions; 
pronotum finely and rugosely punctate, anterior 
margin raised, not produced laterally; mesoscutum 
finely and rugosely punctate; mesoscutellum finely 
and rugosely punctate, sagittally carinate; 
metanotum finely and closely punctate; 
propodeum oblique without dorsal surface, closely 
punctate, densely covered with long curly setae; 
mesopleura, prosternum and coxae finely and 
closely punctate; fore coxae almost flat; metasoma 
conical; tergites finely and closely punctate; T1 
vertically truncate anteriorly with sagittal carina on 
truncation becoming tuberculate dorsally; sternites 
closely punctate to rugosely punctate; SI almost 
flat; hypopygium weakly transversely 
multicarinate dorsally, subtriangular apically with 
