Revision of Macrothynnus 
273 
apical spine, basal angles produced into small 
rounded lobes; genitalia as in Figure 5, parameres 
long, narrow and apically truncate. 
Female 
Measurements 
Body: 25 mm. 
Colour 
Dark brown to black; pleurites and anterior 
margin of tergites yellow. Setae white. 
Structural features 
Head subrectangular, wider than long (1.32:1), 
narrowed ventrally, dorsal angles broadly 
rounded; clypeus broadly truncate, sagittally 
carinate, closely punctate; frons coarsely punctate 
becoming closely to rugosely punctate ventrally; 
vertex punctate; pronotum subrectangular, wider 
than long (1.81:1), slightly narrowed posteriorly, 
punctate becoming closely punctate anteriorly and 
laterally; mesoscutellum punctate; propodeum 
truncate with short dorsal surface, punctate, lateral 
surface sparsely punctate and polished becoming 
closely punctate at dorsal and posterior margins; 
tergites punctate becoming closely punctate on 
posterior segments; T1 truncate with preapical 
carina strongly defined with punctate line; T2 with 
6 (including preapical) evenly spaced complete 
transverse carinae, transversely multicarinate 
anteriorly and between apical and preapical 
carinae; T3-5 with obscure preapical carina 
delineated by line of punctures; stemites closely 
punctate; S5 (Figure 9) transversely and irregularly 
carinate, rugosely punctate basally; pygidium 
subovoid, slightly upturned ventrally, transversely 
carinate dorsally, longitudinally carinate 
dorsomedially, obliquely carinate ventrolaterally, 
slightly excavate laterally. 
Distribution 
Known only from inland southwestern regions of 
Western Australia and South Australia. 
Remarks 
The Ooldea specimen has the name "A.M. Lea" 
ruled out with a line through it on the data label. 
The metasoma of this specimen is yellow and the 
wings are not darker apically. This suggests that 
the colour may have faded in this specimen as 
there are no apparent structural differences in the 
male genitalia between this and the Bencubbin 
specimens. 
Etymology 
The specific name is Latin for new. 
Macrothynnus ivatherooensis sp.nov. 
Figures 1, 6,10 
Material Examined 
Holotype 
6, Watheroo, Western Australia, Australia 19 
October 1985, J. Alcock (NTM 1583). 
Paratypes 
Australia: Western Australia: 10 S, 82, same 
data as holotype (ANIC, NTM, WAM); 4<J, 42, 
Watheroo NP, on Chamaeleucium uncinatum 
blossom, 20 September 1983,10 October 1984, G.P. 
Hall (ANIC, NTM, WAM); Id, South Perth, 22 Oc¬ 
tober 1903, H.M. Giles (ANIC). 
Diagnosis 
Large elongate black or almost black wasps with 
the clypeus yellow and the metasoma reddish 
orange in the male. The male is distinguished by 
tire parameres (Figure 6) which are short, broad 
and apically rounded and the presence of a small 
reddish orange mark at the summit of the eyes. 
The female is distinguished by the pygidial carinae 
(Figure 10) which are oblique laterally. 
Description Male 
Measurements 
Body: 12-27 mm; fore wing: 13-23 mm; hind 
wing: 10-15 mm. 
Colour 
Black; mandibles (except apex) and clypeus 
(except oblique submedial mark) yellow; small 
mark at summit of the eye and metasoma (except 
base of SI) reddish orange; Wings infuscate, fore 
wing darker distally from level of pterostigma, 
veins 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 
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, 
prostemum and coxae finely and closely punctate; 
fore coxae almost flat; metasoma elongate conical; 
tergites finely and closely punctate; T1 vertically 
truncate anteriorly with sagittal carina on 
truncation becoming tuberculate dorsally; sternites 
finely and very closely punctate; SI almost flat; 
hypopygium (Figure 1) weakly transversely 
carinate dorsally, subtriangular apically with small 
apical spine, basal angles produced into small 
