WHEELER: AUSTRALIAN ANTS. 53 
keep in close touch with one another by means of their antennae, after 
the manner of the Dorylinae. They stung severely for such small 
insects. 
The worker of O. mjébergi is readily distinguished from that of 
hedleyi by its paler color, shorter head, antennal scapes and funicular 
joints, the straight dorsal profile of the thorax, broader epinotum and 
petiole, deeper constriction between the postpetiole and gaster, and 
smooth, shining, and sparsely punctate mandibles. 
ONYCHOMYRMEX DODDI, sp. nov. 
Plate 2, fig. 3-5. 
Worker. Length: 2-2.5 mm. 
Head subrectangular, about 4 longer than broad, scarcely broader 
in front than behind, with nearly straight lateral and posterior borders 
and rounded posterior corners. Clypeus with broadly arcuate, finely 
denticulate anterior border, sinuate on the sides. Eyes very similar 
to those of the preceding species, situated about 3 the distance from 
the anterior to the posterior border of the head. Mandibles with the 
long terminal tooth less abruptly bent inward, remaining teeth rather 
small. Antennal scapes # as long as the head; first and terminal 
funicular joints fully twice as long as broad, remaining joints scarcely 
longer than broad. Thorax rather stout, shaped much as in mjébergi, 
with straight, horizontal dorsal outline, the pronotum longer than 
broad, rising rather abruptly from the neck, but posteriorly flattened 
above, its sides only feebly convex. Mesonotum somewhat more 
than twice as broad aslong. Thoracic sutures very distinct. Epino- 
tum in profile with the base feebly and evenly convex and longer than 
the declivity which is sloping and distinctly concave. Petiole in 
profile with a short basal peduncle and_ prominent, compressed, 
somewhat translucent ventral projection; the node with subequal 
anterior and dorsal surfaces, both feebly convex; seen from above as 
long as broad, subrectangular, with rounded sides and straight, 
subequal anterior and posterior borders. Postpetiole as long as broad, 
very convex below and separated by a pronounced constriction from 
the gaster. Legs as in mjébergi. 
Smooth and shining, covered with small piligerous punctures, which 
are most abundant on the head and especially on the cheeks. Mandi- 
bles, clypeus, and cheeks opaque, the mandibles finely and sharply 
