AUSTRALIAN SPECIES OF RHYTIDOPONERA MAYR 
55 
with seven longitudinal striae, the central one appearing as a strong carina, 
shining between striae. Head coarsely and deeply punctate-rugose, the rugae 
longitudinal between frontal carinae diverging slightly outward behind, inter- 
stices densely and finely reticulate. Thorax coarsely and irregularly rugose 
with large, very shallow, scattered punctures, widely spaced, between the 
rugae, interstices densely reticulate. Node punctate-rugose, much finer than 
on thorax. Gaster very densely reticulate-striate. 
Hair yellow, long and erect on front of clypeus and apex of segments of 
gaster, short and sparse on rest of body, very short and suberect on scapes, 
shorter and adpressed on legs. 
Head one-sixth longer than broad, very slightly broader in front than 
behind, sides feebly convex, occipital border convex with a slight concave 
depression in the middle, angles broadly rounded, a strong cre.st follows the 
contour of the border from eye to eye. Mandibles with numerous very fine 
denticles. Clypeus broadly convex in front and above. Frontal area large 
and deep. Frontal carinae as long as broad. Scapes extend beyond occipital 
border by fully one-third their length. Second and third segments of funiculus 
equal length, one-sixth longer than first, apical one-fifth shorter than the 
two preceding together. Eyes placed at posterior third of sides. Thorax 
twice as broad as long, suture sharply impressed. Pronotum as long as 
broad, sides and dorsum feebly convex. Meso-epinotum strongly convex 
transversely. In profile convex longitudinally, pro-mesonotal suture feebly 
impressed, a distinct drop at meso-epinotal junction. Pronotum convex, 
slightly flattened at basal third. Mesonotum feebly convex, with a very 
short truncate edge behind. Epinotum strongly convex from base to bottom 
of declivity. Node one-fourth broader than long, oval, dorsum convex both 
ways. In profile anterior face straight, inclined slightly forward above; 
dorsum straight or very feebly convex, as long as posterior face, both edges 
blunt, but not rounded. Ventral spine long, slender, parallel, three times 
longer than broad. Postpetiole barely one-third longer than broad, cone- 
shaped, sides very feebly convex. First segment of gaster one-third broader 
than long, strongly convex behind. Constriction between segments broad but 
very shallow. Legs robust. 
Male. — Unknown. 
Habitat. — Northern Territory: Borroloola (G. F. Hill, 1911). 
In general appearance similar to R. aurata Rog., but 
readily separated by the form of the head and node. 
RJiytidoponera aciculata Smith. 
(PI. V, fig. 33; Text fig. 3.) 
Ectatomma aciculata Smith, Cat. Hymn. Brit. Mus., vi, p. 104, 1858, . 
Ectatomma aciculata Smith; Mayr, Jour. Mus. Godeffroy, xii, p. 91, 
1876, ^ . 
Ectatomma ( Rhytidoponera ) punctatum Smith subsp. aciculatum Smith ; 
Forel, Fauna Sudwest Austrl., i, p. 268, 1907, . 
Rhytidoponera (Rhytidoponera) punctata s.sp. aciculata Smith, Emery, 
Gen. Ins., fasc. 118, p. 38, 1911,5. 
Ectatomma (Rhytidoponera) cristata Emery s.sp. caro Forel, Rev. 
Suisse Zook, xviii, p. 11, 1910, 5 . 
Worker. — Length, 10 mm. 
Black. Mandibles, antennae, legs and gaster brownish. 
