NEW AUSTRALIAN ANTS. 
convex, a feeble constriction between it and first segment of gastcr, latter 
one-fourth broader than long, strongly convex on sides. Legs slender. 
Female. — Length, 6.5 mm. 
Colour, sculpture and pilosity as in the worker, differing only in the following 
details. 
Head as broad as long, occipital border feebly concave. Eyes much larger. 
Ocelli large. Pronotum two and one-fourth times broader than long. Meso- 
notum broader than long, feebly convex above, parapsidal furrows sharply 
impressed. Scutellum twice as long as broad, oval. Node similar to worker 
but more slender. Wings missing. 
Habitat. — W. Australia : Perth, Armadale, Mundaring, Busselton, Albany. 
Genus ECTOMOMYRMEX Mayr 1867. 
Edomomyrmex ruficornis, sp. nov. 
(PI. II, fig. 14.) 
Worker. — Length, 5.5 mm. 
Black ; mandibles, antennae, tibia, tarsi, anterior half of frontal carinae 
and apex of gaster castaneous ; femora and coxae brownish. 
Opaque, mandibles shining, somewhat coarsely punctate, striate longitudi- 
nally. Head and thorax densely and coarsely reticulate, in parts almost 
punctate. Epinotal declivity strongly and sharply striate transversely, con- 
tinued longitudinally on sides of epinotum. Node transversely arched striate- 
rugose on top. Antennae, legs and gaster linely and densely punctate. Coxae 
feebly reticulate transversely. 
Hair yellow, fine, long and suberect, moderately abundant throughout, 
more so at apex of gaster. Pubescence yellow, fine and adpressed, abundant, 
but by no means hiding the sculpture. 
Head slightly longer than broad, broader behind than in front, sides feebly 
convex, occipital border truncate, straight, or feebly concave in middle. 
Mandibles subtriangular, apex long and sharp, furnished with four large sharp 
teeth, with a small one between each. Clypeus short, produced and bluntly pointed 
in front, with a fine sharp carina which extends from apex to between frontal 
carinae. Frontal carinae approximate, as long as broad, lobe-like in front 
but not hiding the antennal insertions, a weak frontal groove between them 
extending back to middle of head. Scapes barely reaching occipital border ; 
funiculus thickened towards apex, first segment as long as two following 
together, second to tenth broader than long, apical bluntly pointed, as long as 
the three preceding together. Eyes small, flat, with about seven facets, 
placed twice their diameter from the front edge. Thorax fully one and three- 
quarter times longer than broad, almost twice as broad through pronotum as 
through epinotum. Pronotum one-third broader than long, strongly convex, 
pro-mesonotal suture sharply, meso-epinotal suture weakly, defined, dorsum 
of meso-epinotum convex laterally, posterior border concave, sharply margined. 
In profile the pronotum feebly convex, meso-epinotum straight, declivity at an 
oblique angle, straight or feebly convex, edges sharply margined, inferior edges 
of pronotum and prosternum sharply margined. Node two and a half times 
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