46 
Clark — A ustralia n Fonnicidae. 
]^ost])etiok‘ one niid one-half times broader than long, as broa<» 
as the thorax, the anterior border concave, the angles sharp, th( 
sides convex; the anterior and lateral borders strongly marginate’ 
the lateral margins ending abruptly just in front of the posterioi 
border. A strong coiistri' tion between the postpetiole and tho 
first segment of the gaster; this latter is much broader than long: 
and broader l)ehiud than in front, it is broader than the thorax. 
]\vgidiuni truncate, minutely spiiiulose on the sides and tip. Legs? 
short and stout. 
Bah.: Western Australia, National Park (J. Clark). 
This species is not near any other known to me. The peculiari 
1.K)tli-like ])rojection on the clypeus will readily distinguish iti 
.lem all the dcscril)ed forms. The whole insect has a lieavy 
thick-set appearance, and looks shorter than it really is. 
Sub-family PONEEINAE. 
Discothyrea crassicornis n.sp. (PI. VI, 4 and 4a.) 
V orker: Length 1.8mm. 
Rufc.-iestaceous; mandibles, apic.al joints of the antennae and 
U‘gs yellow. Hairs whitish, short and sparse on the whole body- 
i ubescenc( vhitisli, short, very fine* and abundant everywhere, 
iojjgest on the gaster, 
Opacjue. Densely and finely punctate-reticulate on the head, 
more coai'sely so cm the thorax and abdomen, node coarsely punctate 
above. 
Head longer than l)road, broader behind than in front, the 
occipital bordf‘ 1 - and sides convex, the posterior angles rounded. 
Irontal varinae short and erect, dilated behind, truncate behind the 
dil.‘iti(m and continent to the middle of the head, ('lypeus pro- 
duced, widely convex in front, feebly but distinctly crenulate. 
Mandibles moderately long, subtriangular, the terminal border with 
a sharp culling edge which shows no traces of teeth, ending in a. 
sfunewhat long sliarp ])oint. Evqb small, flattened, ])laeed slightly 
ill front of the middle of the sides. No traces of ocelli. Antennae 
h-joiiite<l, short and very thick; scapes short, extending to about 
the o cipital tliird of the head, clnb-shajied, fully three times 
1 sick^'i' at the apex than at the base; first joint of the funiculus as 
oioa-'l as long, cylindrical, five times longer tlian the second, the 
second to seventh much broader than long, subeijual, the seventh 
fully three times broader than the second, the apical joint very 
large, about two and one half times longer than broad, and much 
