48 
AUSTRALIAN SPECIES OF RHYTIDOPONERA MAYR 
posterior three-fourths and declivity. Node transversely striate with a few 
smaller shallow punctures. Postpetiole with very small piligerous punctures. 
First segment of gaster more delicately striate longitudinally, the small punc- 
tures amost obsolete. Femora very finely reticulate with numerous small 
piligerous punctures. 
Hair yellow, rather short and erect, sparse, on clypeus and apex of gaster, 
extremely short on rest of body and appendages. 
Head one-fifth longer than broad, sides convex at cheeks, straight behind, 
occipital border concave at middle, angles strongly rounded, feebly projecting 
forward, but without a crest. Mandibles with numerous, rather coarse, 
denticles. Clypeus strongly convex in front and above with a feeble, longi- 
tudinal impression behind. Frontal area triangular, deep. Frontal carinae 
as long as broad. Scapes extend beyond occipital border by one-third their 
length. First and third segments of funiculus equal in length, barely one- 
fourth shorter than second ; apical very slightly shorter than the two preceding 
together. Eyes placed at the posterior third of sides. Thorax twice as long 
as broad, both sutures weakly impressed. Pronotum one-fifth broader than 
long, sides straight or very feebly concave at middle, dorsum convex. Meso- 
notum fully one-fourth broader than long, anterior edge feebly convex, 
posterior and sides strongly convex, dorsum strongly convex both ways. 
Epinotum strongly convex transversely. In profile sutures sharply impressed. 
Pronotum convex in front and behind, straight in middle, sloping downward 
in front. Mesonotum strongly convex. Epinotum lower than mesonotum, 
anterior half of dorsum straight, posterior half convex, bottom half of 
declivity straight. Node one-fourth broader than long, strongly convex in all 
directions. In profile the anterior face feebly concave, sloping forward below, 
posterior face vertical, rounded into, and shorter than, dorsum, anterior edge 
of dorsum sharp, the top flat and straight. Ventral spine long, slender and 
sharp, twice as long as broad at base. Postpetiole one-fourth broader than 
long, sides and front broadly convex. First segment of gaster barely one- 
fourth broader than long, strongly convex behind, constriction between the 
two segments sharp but not deep. Legs long and robust. 
Male. — Unknown. 
Habitat. — South Australia: Lake Killalpaninna (Prof. J. W. Gregory, 
Described from two si^ecimens. 
Rhytidoponera ferniginea sp. nov. 
(PL IV, fig. 25.) 
Worker. — Length, 10-11 mm. 
Bright ferrugineus throughout, in a few examples the gaster and legs a 
shade lighter. 
Shining. Mandibles very finely striate longitudinally, almost superficially 
at base, with^ numerous small, scattered piligerous punctures. Scapes very 
delicately striate longitudinally. Clypeus longitudinally rugose, the rugae 
shining at bottom. Frontal carinae strongly striate-reticulate longitudinally, 
remainder of head very finely and densely striate-reticulate, diverging outward 
behind and encircling the antennal fovea in front, transverse at occiput, with 
small, shallow, very scattered punctures throughout. Thorax very finely and 
densely striate-reticulate transversely, coarser on epinotal declivity, somewhat 
irregular at base of pronotum, with small, shallow, very scattered punctures. 
