AUSTRALIAN SPECIES OF RHYTIDOPONERA MAYR 
43 
rugose, transverse behind the eyes, longitudinal between the frontal carinae, 
circling round the antennal fovea and continuing longitudinal on cheeks, 
smooth and highly polished between the striae. Thorax striate-rugose as on 
head. Pronotum transversely arched striate-rugose, more irregular and 
puncture-like behind. Mesonotum irregularly striate-rugose. Epinotum 
transversely striate-rugose, coarser behind than in front. Node circularly 
striate. Both segments of gaster transversely arched, striate very finely and 
with numerous fine punctures. 
Hair yellow, short and erect, moderately abundant throughout, longer on 
clypeus and apex of gaster. 
Head one-fifth longer than broad, broader in front than behind, sides 
straight to anterior fourth then strongly convex. Occipital border straight, 
angles bluntly rounded, a prominent ridge or crest, interrupted and depressed 
in the middle, projects feebly at each of the angles. Mandibles sharp, eden- 
tate. Clypeus narrow, rather flatly convex above, with a distinct depression 
in the middle joining with frontal area, strongly convex in front. Frontal 
carinae as long as broad in front, twice as broad in front as behind. Frontal 
area large and deep. Scapes extend beyond occipital border by more than 
one-third their length. Second segment of funiculus one-fourth longer than 
first, third slightly shorter than second, apical as long as the two preceding 
together. Eyes placed behind the middle of the sides. Thorax two and a half 
times longer than broad, pro-mesonotal suture deeply impressed, meso-epinotal 
suture feebly indicated. Pronotum one-fifth broader than long, sides almost 
parallel, concave in the middle, feebly convex transversely with a slight 
depression in the middle behind making the hind angles somewhat shoulder- 
like. Mesonotum one-fifth broader than long, broader in front than behind. 
Strongly convex in all directions. Epinotum strongly convex transversely. 
In profile pronotum flat, sloping downward and truncate in front. _ Mesonotum 
evenly convex. Dorsum of epinotum straight, rounded into declivity, the latter 
as long as dorsum. Node one-fourth broader than long, oval. In profile fully 
twice as high as long, the anterior face descending at an acute angle, slightly 
concave, posterior face vertical, straight, slightly shorter than dorsum, the 
latter straight, anterior and posterior edges sharp; the ventral spine long, 
slender and sharp. Postpetiole fully one-fourth broader than long. First 
segment of gaster one-fifth broader than long, sides strongly convex. Con- 
striction between both segments sharp and deep. Legs robust. 
Male. — ^Unknown. 
Habitat. — North Queensland: Mutchilba (A. D. Selby). 
Rhytidoponera socrus Forel. 
(PL IV, fig. 20.) 
Ectatomma (Rhytidoponera) socrus Forel Ann. Soc. Ent., Belg., xxxvii, 
p. 236, 1894, 0 . 
Ectatomma (Rhytidoponera) socrus Forel, Wheeler, Jour. New York 
Ent. Soc., xvii (i), p. 25, 1909,^ $. 
Rhytidoponera (Rhytidoponera) socrus Emery, Gen. Insect., fasc. 118, 
p. 38, 1911, $ . 
Worker. — Length, 11 -5 mm. 
Light chocolate-brown, mandibles, antennae and legs lighter. 
Mandibles, scapes and tarsi very finely and densely striate longitudinally. 
