40 
AUSTRALIAN SPECIES OF RHYTIDOPONERA MAYR 
Frontal carinae as long as broad in front. Scapes extend beyond occipital 
border by almost half their length. Second segment of funiculus almost twice 
as long as first and one-fourth longer than third, apical segment as long as 
the two preceding together. Eyes rather small, placed at the posterior third 
of sides. Thorax fully twice as long as broad, sutures feebly impressed. 
Pronotum one-third broader than long, sides slightly compressed behind, 
flatly convex transversely above. Mesonotum one-fourth broader than long, 
strongly convex in all directions. Epinotum convex transversely. In profile 
sutures well defined. Pronotum sloping downward and forward, dorsum 
flat, convex at base and apex. Mesonotum convex, high. Epinotum strongly 
convex. Node one-third broader than long, strongly convex in front, flatly 
convex behind. In profile longer than high, anterior face vertical, straight, con- 
cave at base, posterior face short, straight, rounded into dorsum, the latter 
straight, slightly higher in front than behind, anterior edge sharply rounded ; 
ventral spine long and sharp, almost three times as long as broad at base. 
Postpetiole fully one-third broader than long, strongly convex in front and on 
sides. Constriction between postpetiole and gaster deep and wide. First 
segment of gaster one-fourth broader than long, sides strongly convex. Legs 
long and robust. 
Male. — Unknown. 
Habitat. — Western Australia: Wadgingarra, north of Yalgoo (L. Glauert). 
Type in the Western Australian Museum, Perth. 
Near R. mayri Emery, but readily separated by the forma- 
tion of the thorax and node, sculpture and pilosity. 
Ectatomma nudatum Mayr, Jour. Mus. Godeffroy, xii, p. 91, 1876,5?. 
Rhytidoponera (Rhytidoponera) nudata Emery, Gen. Ins., fasc. 118, 
p. 38, 1911,5. 
Worker. — Length, 12 mm. 
Head, thorax and node blackish-brown, gaster black. Mandibles and scapes 
chocolate-brown, funiculi and legs lighter brown. 
Fig. 2. Rhytidoponera occidentalis sp. nov. 
Worker. 
Rhytidoponera nudata Mayr 
(PI. IV, fig. 17.) 
