AUSTRALIAN SPECIES OF RHYTIDOPONERA MAYR 
25 
Male. — Unknown. 
Habitat. — North-Western Australia: Derby district (J. G. Campbell). 
Redescribed from a co-type and a dozen specimens from the 
type nest. 
Rhytidoponera taurus Porel. 
(PI. Ill, figs. 2, 3.) 
Ectatomma (Rhytidoponera) cornutum Emery, subsp. taurus Forel, 
Rev. Suisse Zook, xviii, p. 12, 1910, ^ . 
Rhytidoponera cornuta Em., r. taurus Forel, Arkiv. f. Zook, 9, 16, p. 
12, 1916, ^ 5 . 
Rhytidoponera (Rhytidoponera) cornuta Em., subsp. taurus Forel, 
Emery, Gen. Ins., fasc. 118, p. 38, 1911,?. 
Rhytidoponera cornuta Emery, var. fusciventris Stitz, Ges. Natrt. 
Freunde Berk, (8), p, 352, 1911,?. 
Rhytidoponera cerastes Craw., var. hrevior Crawley, Ann. Mag. Nat. 
Hist., 9, xvi, p. 586, ? $ . 
Worker. — Length, 10-11 mm. 
Blackish-brown. Mandibles, funiculi, tarsi and gaster more reddish-brown. 
Some examples are entirely reddish-brown, others quite black with the gaster 
reddish-brown. 
Mandibles and scapes very finely and densely striate longitudinally. Head 
coarsely, irregularly, punctate-reticulate. Pronotum, mesonotum, and node 
coarsely and rather deeply punctate, epinotum coarsely punctate-rugose with 
a transverse direction, anterior face and groove on top of node transversely 
striate. Gaster very finely striate longitudinally. 
Hair yellow, long and erect on clypeus and apex of gaster, very sparse, 
short and erect on head and thorax, more abundant on gaster, shorter and 
adpressed on antennae and legs. Pubescence apparent on funiculi only. 
Head fully one-fifth longer than broad, liroadest in front, sides convex, 
occipital border concave, angles sharp pointed, produced backward and 
slightly outw'ard. Mandibles furnished with numerous minute teeth. Clypeus 
convex above, bluntly produced and convex in front. Frontal carinae as 
long as broad in front, fully twice as broad in front as behind. Frontal area 
deep. Scapes extend beyond occipital corners by barely one-third their 
length. Second and third segments of funiculi equal length, one-third longer 
than first, apical not as long as two preceding together. Eyes large and 
convex placed behind middle of sides. Thorax twice as long as broad. 
Pronotum one-fifth broader than long, broader behind than in front, the 
sides concave in the middle, flattened transversely. Mesonotum circular. 
Epinotum as long as broad. In profile convex longitudinally, dorsal sutures 
well impressed, dorsum of pronotum feebly concave in middle, dropping 
abruptly, convex in front, epinotum sloping, convex, from mesonotum to 
foot of declivity. Node broader than long, oval; with a deep longitudinal 
impression on dorsum ; in profile twice as high as long, triangular, anterior 
face sloping forward below, concave, anterior face convex, apex sharp, spine 
at front of ventral face short and sharp, not as long as broad at base. Post- 
petiole slightly broader than long, somewhat cone-shaped, excision between 
the segments strongly impressed, first segment of gaster one-fourth broader 
than long. Legs robust. 
c 
