AUSTRALIAN FORMICIDAE 
87 
longitudinally. Head longitudinally rugose in front, diverging outward and 
more punctate-rugose behind. Scapes very finely and densely striate longitu- 
dinally. Thorax coarsely and irregularly punctate-rugose, the punctures 
large and deep, shining at the bottom. Node more finely punctate. Postpetiole 
very finely and densely reticulate-striate, the indistinct striae transversely 
arched. First segment of gaster very finely and densely striate transversely, 
the striate almost obsolete behind. 
Hair yellow, short and erect throughout, shorter and suberect on antennae 
and legs. Pubescence nil. 
Head very slightly longer than broad, sides convex, occipital border 
concave, with traces of a crest, angles sharply rounded. Mandibles furnished 
with small sharp teeth. Clypeus broadly convex above and in front. Frontal 
area large, triangular. Frontal carinae almost one- third longer than broad 
in front. Scapes extend beyond occipital border by their thickness; first 
segment of funiculus almost twice as long as second, apical as long as the 
two preceding combined. Eyes small, globular, their anterior border placed 
at middle of sides. Thorax almost one-third longer than broad, pro-mesonotal 
suture faintly impressed, meso-epinotal suture not indicated. Pronotum one 
and three-fifths broader than long, sides and front strongly convex, dorsum 
convex transversely. Mesonotum one-third broader than long, convex in all 
directions. Epinotum almost twice as broad as long, convex transversely ; in 
profile pronotum abruptly raised convex, then evenly convex to top of 
epinotal declivity; dorsum of epinotum as long as declivity into which it is 
rounded. Node twice as broad as long, sides and front hemispherical, straight 
behind; in profile higher than long, anterior face vertical, slightly convex, 
posterior face vertical slightly concave, dorsum convex, as long as posterior 
face, both edges rounded; ventral process large, as long as broad, a large 
transparent puncture in the middle at base, the process is furnished with two 
large sharp spines, one in front directed downward, the other at the posterior 
corner and directed backward. Postpetiole one-third broader than long, 
sides and front feebly convex, angle rounded ; constriction wide and shallow. 
First segment of gaster broader than long. Legs robust. 
Male and female unknown. 
Habitat. — Northern Territory: Koolpinyah (C. L. Barrett, 1933). 
Not near any of the previously described species, but the 
size and colour are similar to those of C. tasmaniensis Em. 
Subfamily Dolichoderinae Forel. 
Zeitschr. Wiss. Zool., xxx, Suppl., p. 54, 1878. 
Genus lEIDOMYRMEX Mayr. 
Verb. Zool. hot. Ges. Wien, xii, p. 702, 1862. 
Iridomyrmex viridigaster sp. nov. 
Plate XIII, Fig. 18. 
Worker. Length 4 5 mm. 
Posterior two-thirds of head, epinotum, node and legs brown; mandibles. 
