75 
AUSTRALIAN SPECIES OF RHYTIDOPONERA MAYR 
long, strongly convex in all directions. Mesonotum one-third broader than 
long, strongly convex. Epinotum very short and convex. In profile strongly 
convex longitudinally, deeply excised at the mesonotal sutures. Node as 
long as broad, circular, sharply pointed behind. In profile higher than long, 
anterior and posterior faces almost parallel, both feebly concave, dorsum 
feebly convex, anterior edge rounded, posterior edge sharp, the ventral spine 
long and broad,^ the anterior edge ending in a long sharp point directed back- 
ward. Postpetiole slightly broader than long, bell-shaped, first segment of 
gaster also broader than long, the constriction between the two segments 
rather deep and wide. Legs long and robust. 
Male. — Length, 7'0 mm. (after Crawley). 
^^Bright castaneous, shining; antennae and teeth of mandibles darker. 
A short and fine pilosity scattered over whole body; legs with exserted 
hairs, underside of scape with a row of similar hairs, funiculi hairy, with both 
exserted hairs and pubescence. 
“Mandibles broad, with numerous small teeth. Clypeus arched, the anterior 
border convex. Head narrowed behind eyes, which are large and prominent, 
occupying more_ than three-quarters of sides of head. Scape two-thirds as 
long as second joint of funiculus, which is the longest joint. First joint as 
broad as long; third, fourth, and fifth subequal, thence diminishing gi'adually 
to the apical, which is half as long again as the penultimate. 
“Promesonotum arched, metanotum very prominent. Epinotum feebly 
curved. Node from above long and narrow; the anterior quarter is divided 
from the rest by a transverse ridge beyond which the node narrows and 
widens again to the base. In profile it is low, rising to its highest point 
behind, the projecting ends of the above-mentioned ridge forming a break 
at the anterior quarter. Gaster deeply constricted between the first and second 
segments. 
“Mandibles finely striate. Clypeus and rest of head coarsely and irregu- 
larly longitudinally rugose. Promesonotum and metanotum with coarse, 
shining, reticulate punctures, which tend to become longitudinal in direction 
on the latter part of mesonotum and on the metanotum. Sides of thorax 
and the epinotum irregularly longitudinally rugose, the node slightly rough- 
ened, gaster smooth. Coxae and femora faintly reticulate.” 
Habitat. — Northern Territory. Port Darwin (type locality) (G. F. Hill; 
Sir B. Spencer; C. Barrett). 
RJiytidoponera crassinodis Forel. 
(PI. VI, fig. 53.) 
Ectatonima (RJiytidoponera) crassinode Forel, Fauna Sudwest. Austrl., 
i, p. 270, 1907, i? . 
RJiytidoponera (RJiytidoponera) crassinodis Forel, Emery, Gen. Insect., 
fasc. 118, p. 38, 1911, ^ . 
Rhytidoponera crassinodis Forel, Arkiv. f. Zool., 9, 16, p. 11, 1916, ^ $ . 
Worker. — Length, 8-9 mm. 
Head, thorax and gaster chocolate brown, funiculi and legs lighter, more 
reddish. 
Mandibles, scapes, and tibiae finely and densely striate longitudinally. 
Clypeus longitudinally rugose. Head coarsely rugose, longitudinal between 
the frontal carinae, diverging outward behind. Thorax and node coarsely 
