Revision of Macrothynnus 
271 
strongly raised basal and preapical carinae, smooth 
anterior to basal carina and between apical and 
preapical carinae; T3-5 with obscure preapical 
carina delineated by line of punctures; sternites 
punctate becoming closely punctate laterally, and 
becoming closely punctate on S4; S5 (Figure 7) 
longitudinally multicarinate, carinae convergent 
posterolaterally, deeply and closely punctate 
basally and laterally; pygidium ovoid, slightly 
upturned ventrally, transversely carinate dorsally, 
longitudinally carinate dorsomedially, not excavate 
laterally. 
Distribution 
South-western Western Australia. 
Remarks 
Body length is very variable. Specimens are 
typically large, but the specimens from Kwinana, 
Northcliffe and Yallingup Cave are distinctly 
smaller. No structural differences were found in 
the genitalia of these smaller specimens. 
Macrothynnus molitor (Smith) 
Figures 2, 8 
Thynnus molitor Smith, 1859: 43. 
Material Examined 
Holotype 
$, no locality data, (BMNH 15.145). 
Diagnosis 
Large and stout almost black wasp. 
Distinguished from all species by presence of 
numerous transverse carinae on T1 apically (Figure 
2 ). 
Description Male 
Unknown. 
Female 
Measurements 
Body: 25 mm. 
Colour 
Dark brown to black. Setae pale brown. 
Structural features 
Head subrectangular, wider than long (1.12:1), 
narrowed ventrally, dorsal angles broadly 
rounded; clypeus broadly truncate, sagittally 
carinate, impunctate; frons coarsely punctate 
becoming closely punctate ventrally; vertex 
sparsely punctate; pronotum subrectangular, wider 
than long (1.86:1), slightly narrowed posteriorly. 
very finely and closely punctate overlain with scat¬ 
tered larger punctures, anterior margin with line of 
coarse punctures; mesoscutellum very finely and 
closely punctate overlain with larger punctures; 
propodeum truncate with short dorsal surface, 
dorsum very finely and closely punctate overlain 
with larger punctures, lateral surface very finely 
and closely punctate and polished becoming close¬ 
ly punctate dorsally, posterior surface finely and 
very closely punctate overlain with scattered shal¬ 
low punctures; tergites punctate to sparsely punc¬ 
tate; T1 (Figure 2) truncate with strong preapical 
carina and numerous smaller transverse carinae 
anterior to preapical carina; T2 with approximately 
11 complete transverse carinae between strongly 
raised basal and preapical carinae, transversely 
multicarinate anterior to basal carina and between 
apical and preapical carinae; T3-5 with obscure 
preapical carina delineated by line of punctures; 
sternites closely punctate, impunctate 
posteromedially; S5 (Figure 8) obliquely 
multicarinate, deeply and closely punctate basally; 
pygidium subovoid, slightly upturned ventrally, 
transversely carinate dorsally, longitudinally cari¬ 
nate dorsomedially, lateral margins slightly sinuso¬ 
idal. 
Distribution 
South Australia. 
Remarks 
This species is known from a single specimen 
which bears the label "believed to be type of T. 
molitor Sm. RET" in R.E. Turner's hand writing. 
Although Smith (1859) states that the species comes 
from South Australia, there are no locality labels 
on this specimen, and it is therefore possible that it 
may not be the type of M. molitor. 
The metasoma of this specimen is damaged: T2 
has a triangular pin hole (Figure 2), and the right 
pleurites, especially on T2 are raised. 
Macrothynnus mustus sp.nov. 
Figures 5, 9 
Material Examined 
Holotype 
<S, Bencubbin, Western Australia: Australia 
30.49S, 117.51E, on melaleuca flowers, 9 October 
1983, R.P. McMillan (WAM 86-711). 
Paratypes 
Australia: Western Australia: 1$, mounted with 
holotype (WAM 86-712); Id, 1$, same data as ho¬ 
lotype (NTM); South Australia: 1 6, Ooldea, A.M. 
Lea (SAM). 
