AUSTRALIAN SPECIES OF RHYTIDOPONERA MAYR 
17 
9. Occipital border with or without feeble projections 12 
10. Angles bluntly pointed, short and curved forward. Pronotum 
with distinct raised shoulders. Node longer than high, 
convex behind. Caster smooth and shining. Black. 12-5- 
14 mm scabra Mayr 
11. Angles with a small obsolete tubercle. Shoulders bluntly 
raised. Node high, slender, sharp pointed, posterior face 
convex with a deep longitudinal groove. Caster smooth and 
shining. Postpetiole with an obsolete longitudinal central 
groove. Black. 12 mm niidata Mayr 
12. Angles without projections or tubercles. Shoulders bluntly 
raised. Node much longer than high, much longer below 
than above, anterior face vertical, straight, dorsum without 
longitudinal groove, rounded into posterior face. Spine 
thorn-like, sharp. Caster transversely striate. Chocolate 
brown. 11-12 mm laticeps For. 
13. Head truncate behind 63 
14. Occipital border concave in middle; crest prominent 33 
15. Angles bluntly rounded, sculpture coarse 27 
16. Node almost cubic, stalk short, anterior face 
straight, posterior face short, rounded into dorsum. 
Spine broad at base, reduced suddenly to a slender 
shai'iD point. Caster transversely arched striate. 
Black. 12 mm glabrior For. 
17. Node cubic, stalk long, anterior and posterior faces 
parallel, dorsum flat, posterior edge rounded, spine 
long and slender. Postpetiole longitudinally arched 
striate, gaster transversely striate. Blackish brown. 
12-13 mm mayri Em. 
18. Node massive, anterior face vertical, dorsum flat, 
posterior face short, rounded into dorsum. Ventral 
spine long, broad and sharp. Postpetiole and gaster 
transversely striate. Black. 11-5-12 mm 
occidentalis sp. nov. 
19. Node dome-shaped, all faces convex, spine long, 
stout and sharp. Caster transversely arched striate. 
Blackish-brown. 11 5 mm petiolata sp. nov. 
20. Node massive, longer at base than on top. Dorsum 
slightly longer than posterior face. Caster trans- 
versely arched striate. Black. 12-5 mm. spoliata, Em. 
21. Node dome-shaped, ventral spine short, thick and 
sharp. Postpetiole and gaster transversely arched 
striate, almost longitudinal in middle. Black 11 
mm stridulator, sp. nov. 
22. Node cubic, faces parallel, dorsum feebly convex, 
spine long, slender and sharp. Caster transversely 
striate. Brown. 11-5 mm socrus Em. 
23. Node longer than high, faces straight and parallel, 
dorsum feebly convex. Caster very finely striate 
transversely. Chocolate brown. 11 mm. nitida sp. nov. 
B 
