new Ants from Australia. 433 
Mundaring Weir, W.A. (Clark, no. 112). 
Type W. C. C. coll. 
Pilosula group, and differs from pilosula principally in 
colour of mandibles and antennz, and thinner and longer 
mandibles, narrower occiput, and in the shape of the thorax 
and nodes. The 2 pupa measures 11:0 mm. 
Phyracaces CLARKI, Sp. 0. 
Length 6°5 mm. 
Uniform dark castaneous, with some indistinct dark 
smudges on second segment of gaster. 
External border of mandibles concave. Head slightly 
broader than long, broadest at eyes, narrowest in front, 
occipital border concave with somewhat sharp lateral angles. 
Frontal carine similar to those of singularis as described by 
Forel, the narrow posterior prolongation reaching to beyond 
the middle of the eyes, which are prominent and situated 
slightly behind the middle of sides of head. Carine of 
cheeks prominent, the posterior portion concave, the 
anterior portion convex, terminating at the side in a tooth- 
like angle. The carina is bordered by a ridge which, seen 
from the side, forms a rectangular enclosure not quite 
touching the base of the mandibles and then almost com- 
pletely encircling the eye. A ridge also commences below 
the base of the mandible, and forms the lateral and posterior 
border of the head. The scapes do not quite reach the 
posterior third of head, the terminal joint of funiculus 
equals the preceding two. All joints, except the second 
and the last two, are as broad as, or broader than, long. 
Thorax narrower than head, not quite twice as long as broad 
at pronotum, where it isa fraction broader than at epinotum. 
Pronotum broader than long, broadest just behind the 
shoulders which are sharply angled; the anterior border 
straight, the posterior concave, limited by a suture which in 
some specimens is quite distinct, in others only indicated ; 
mesonotum broader than long, bounded behind by traces of 
a suture which is practically straight. Base of epinotum 
similarly shaped to pronotum but inverted, and is broadest 
at the extreme border instead of just in front. Declivity of 
epinotum broad, concave from top to bottom and slightly 
convex from side to side, as long as, or a fraction longer 
than, the base, a sharp carina dividing the two. Lateral 
and anterior borders of pronotum, and lateral borders of 
epinotum, with a sharp carina. Petiole once and a half as 
broad as long, broader behind than in front (in singularis the 
node is broader in front), widely concave in front, its sharply 
marginate sides produced into broad flat teeth behind ; 
