48 Clark — Australiayi Formicidae, 
Head longer than broad, as broad in front as behind, the 
occipital border concave, the angles rounded sides feebly convex, 
frontal carinae rather hat, overhanging the antennal insertions 
ill front, extending back to the eyes, and continued further as 
feeble tarinae; there is a faint carinae in the middle, between the 
frontal carinae, extending from the front edge of the clypeus to 
the occipital border; in some exani])les the carinae is scarcely to 
be distinguished from the rugae of the head. Clypeus broadly 
rounded in front, convex above- Eyes small, flattened, placed 
behind the middle of the sides. No traces of ocelli. Mandibles 
triangular, tlie external border convex, the terminal border armed 
with five long sharp teeth. Antennae short and robust, the scapes 
extending back slightly beyond tin* posterioi- margin of the eyes, 
they are gradually thickened To the apex; first joint of the funiculus 
about twice as long as broad, tlu' second a little longer than the 
third, but broader than long, tliinl to tenth broader than long, 
the apical joint about twice as long as broad, and as long as the 
four preceding joints together. Thorax! fully one and one half 
times as long as broad, broadest through the pronotum, wdiich is 
almost twice as broad as the epinotuin at the top of the declivity; 
pro-mesonotal suture sharply impressed; the suture between the 
mesonotiim and the epinotum feebly indicated. The anterior and 
lateral borders of the pronotum convex, the anterior angles sharp, 
the posterior border of the epinotum concave, the angles produced 
;is tootli-like projections; in profile the thorax is rounded and con- 
vex above, the epinotal declivity abrupt, feebly margined above 
and on the sides. Node twice as broad as long, broadest just 
behind the middle, almost oval, but the posterior border not so 
strongly convex as the anterior; in profile it is more than twice 
as high as long, the anterior face sloping at a slight angle, the 
to|i edge rounded, the posterior face straight, the ventral surface 
with a moderately long sharp tooth-like projection almost directly 
luider the anterior face; this tooth has a broad translucent lamella 
attaclied to its anterior edge, the ianiella is as long as it is broad. 
First segment of the gaster broader than long, broader behind 
than in front, the anterior border straight, the angles rounded, 
the sides convex; in profile it is blunflx ]>rodnced in fi’ont below. 
A slight constriction between the first and second segment- The 
second segment is as long as the first, it is broader in front than 
behind. The apical segments short, liidden by the second. Sting 
long and stout. Legs short and stout. 
Hah.: Western Australia. National Park (J . Clark). 
Described from a small colony found under a stoiiC. 
This ant feigns death on being disturbed, or when the stone is 
removed from above the nest. This is the first example of the 
genus to be found in Western Australia. The other Australian 
