AUSTRALIAN SPECIES OF RHYTIDOPONERA MAYR 
81 
Node thin, three times broader than long, convex in all directions, a feeble 
depression in middle of anterior edge. In profile like a slender cone, twice 
as long at base as on top, anterior and posterior faces convex, dorsum very 
short and rounded, ventral spine short and sharp, twice as long as broad at 
base. Postpetiole one-sixth broader than long, broadly convex in front, sides 
feebly convex. First segment of gaster about one-third broader than long, 
strongly convex behind. The constriction between the two segments strong 
but rather shallow. Legs long and rather slender. 
M ale. — Unknown. 
Habitat. — Nezv South Wales: Bourke (C. Barrett, 1933). 
Described from a dozen specimens. Readily separated by 
tbe shape of the node. 
Rhytidoponera nigra sp. nov. 
(PI. VI, fig. 59.) 
W orker. — Length, 8 mm. 
Black. Mandibles, antennae and legs chocolate-brown. 
Mandibles, scapes and tibiae very finely and densely striate. Clypeus 
coarsely punctate-rugose, the rugae longitudinal. Head coarsely rugose, 
longitudinal between frontal carinae, diverging outward behind, with numerous 
large deep punctures between the rugae, interstices densely reticulate. Pro- 
notum circularly and coarsely rugose, with numerous large deep punctures 
between the rugae, the punctures in front shallow, interstices densely reticu- 
late. Mesonotum coarsely, irregularly rugose, the punctures smaller and more 
numerous than on pronotum. Epinotum transversely striate-rugose, finer 
in front than behind, with some large shallow isolated punctures near the 
middle. Node circularly striate-rugose, anterior and posterior faces trans- 
versely striate. Gaster finely striate, transversely arched. Femora finely 
reticulate. 
Hair reddish, long and erect on front of clypeus and apical segments of 
gaster, shorter but abundant on head and thorax, short and suberect on 
antennae, legs and gaster. 
Head one-fourth longer than broad, sides feebly convex, occipital border 
short, straight or very feebly convex, angles broadly rounded, with a feeble 
sharp crest. Mandibles furnished with numerous very small denticles. Clypeus 
strongly convex above and in front. Frontal area shallow. Frontal carinae as 
long as broad in front. Scapes extend beyond occipital border by one-third 
of their length. First three segments of funiculus equal in length, apical 
twice as long as broad, as long as the two preceding together. Eyes placed 
in front of the posterior third of sides. Thorax twice as long as broad, sutures 
sharply impressed. Pronotum one-sixth broader than long, sides feebly con- 
vex, dorsum strongly convex transversely. Mesonotum one-fourth broader 
than long, strongly convex behind and on sides, front feebly convex and 
bluntly pointed in middle, dorsum strongly convex both ways. Epinotum 
strongly convex transversely. In profile sutures strongly impressed. Pro- 
notum strongly convex in front, weakly convex behind. Mesonotum evenly 
convex. Epinotum lower than mesonotum, strongly convex from base to 
bottom of declivity. Node two and one-half times broader than long, rather 
scale-like, anterior and posterior faces straight, sides and dorsum convex. 
In profile slender, anterior and posterior faces straight and parallel, dorsum 
