AUSTRALIAN SPECIES OF RIIYTIDOrONnR.l MAYR 
29 
much broader in front tlian behind, anterior border convex, angles sbar]>, 
posterior border strongly convex. Mesonotuni and cpinotum strongly convex 
transversely. In ])rofile pro-incsonotal suture deejily impressed. I’ronotuin 
erect, convex. Mesonotum strongly convex from a]oex to base. Sculellum 
dome-shaped. Metanotum as long as high, bluntly pointed. EiMnotnni con- 
vex, sloping downward behind, declivity straight, as long as dorsum. Node 
parallel, feebly convex behind. In profile convex from apex to base, highest 
behind. The ventral spine long, very slender and sharp, four times longer 
than broad at base. Postpcliole one-fifth broader than long, cone-shaped, 
sides slightly convex. First segment of gastcr one-third broader than long, 
broadest behind, sides convex. Genitalia retracted. Legs long and slender. 
Habitat. — Northern Territory: Darwin (G. F. Hill, C. Barrett). North 
Queensland: Mareeba (II. F. Hill). 
Ixhiliidoponcra viirahilift sp. iiov. 
(PI. in, fig. 7.) 
Worker. — Length, 13 mm. 
Black. Mandibles, gaster and legs brownish-black, last six segments of 
funiculi reddish. 
Mandibles finely and somewhat irregularly striate longitudinally. Clypeus 
and frontal carinae longitudinally rugose, head coarsely rugose, the rugae 
diverging outward and circling downward on the cheeks, transverse at the 
occipital border. Scapes and tibiae finely striate longitudinally. Thorax 
coarsely rugose. On the jmmotum the ruf^ae irregular or somewhat circidar 
behind, transverse in front; anterior third of mesonotum longitudinally 
rugose, the posterior two-thirds and whole of cpinotum and anterior face of 
node transversely rugose. Dorsum of node very finely circularly rugose. 
Postpetiolc transversely arched .and rather strongly striate, first segment of 
gastcr very finely and densely striate transversely, in addition both segments 
densely and microscopically jninctate. 
Hair yellow, very short and bristle-like, confined to anterior of clypeus. 
Pubescence yellow, very sliort and adpressed, abnndant thronghont, slightly 
longer and mi^re erect on legs. 
I lead one-fourth kmger th.an broad, very slightly broader in front than at 
occipital corners, narrowest just beliind eyes, occipital border strongly and 
deeply indented in tlie middle, the angles strongly roundcfl and projecting 
slightly at the .sides and in front. M.andibles feebly denticulate. Cly])cus 
strongly convex in front and above. Frontal carinae as long as broad in 
front. Fyes placed behind the middle of sides. Scapes extend beyond occipi- 
tal border by fully one-third their length. Second segment of funiculi one- 
third longer than first, ajfical as long as the two preceding together. Thorax 
two and one-third times longer than broad. Pronotum one-third broader than 
long, broader behind than in front, the lateral borders very feebly convex, 
dorsum flattened, rounded into sides, the latter flattened or feebly concave. 
Pro-mesonotal suture shar])ly defined. Mesonotum broader tlian long, much 
broader in front than behiml, strongly convex in all directions. Epinotum 
barely twice as long as broad, sides parallel, strongly convc.x transversely. 
In profile convex longitudinally, the ]n'onotum almost straight, descending 
at an obtuse angle, tlie dorsum of cpinotum straight giving the thorax a 
slightly depressed a|)pcarance, rounded into declivity, the latter at about the 
same angle as pronotum, tooth on lower angle of pronotum obsolete. Node 
