A REVISION OF THE GENUS PROMYRMECIA EMERY (FORMICIDAE) 107 
Habitat—Western Australia: Perth (type locality); widely distributed and 
abundant from Albany to Geraldton. 
The colour of the thorax and node varies from all black on some 
individuals to almost all red on others. The same series of colour 
variations occur in all nests. 
Promyrmecia rubicunda sp. nov. 
Plate XV, fig. 65 
Worker. Length 5:5-6°5 mm. 
Head, pronotum, mesonotum and gaster black, mandibles and labrum yellow, 
funiculus, epinotum, node, postpetiole and all legs reddish-yellow, scapes brown. 
Mandibles smooth and shining, with six large, shallow punctures on apical half 
at base of teeth. Head very delicately striate longitudinally, densely reticulate 
between the striae. Thorax and node densely reticulate, pronotum and epinotum 
with traces of transverse rugae; postpetiole and gaster microscopically punctate. 
Hair yellow, erect, rather sparse except on apex of gaster, short and suberect on 
legs. Pubescence white, very fine and adpressed, forming a thin silky covering on 
postpetiole and gaster, not hiding the sculpture. 
Head as long as broad, occipital border short and straight, sides convex, angles 
broadly rounded. Mandibles as long as head, external border straight or very 
feebly concave, inner border convex, furnished with four large, sharp, erect teeth 
each preceded by two small denticles. Scapes not reaching the occipital border by 
fully their thickness; first and third segments of funiculus equal length, second 
one-fifth longer. Thorax two and one-third times longer than broad. Pronotum 
one and three-quarter times broader than long, convex in all directions ; mesonotum 
as long as pronotum, circular, as long as broad, excision deep and wide; epinotum 
one-fourth longer than broad, convex transversely; in profile evenly convex from 
apex of pronotum to base of mesonotum with a very faint depression at pro- 
mesonotal suture, mesonotum highest at middle; excision deep and wide; dorsum 
of epinotum feebly convex, twice as long as declivity into which it is rounded. 
Node very slightly longer than broad, slightly broader behind than in front, sides 
feebly convex, anterior border strongly convex, posterior border almost straight ; 
in profile longer than high, anterior face short and vertical, rounded into the rather 
flattened dorsum, posterior face convex, very short, ventral spine short and broad, 
bluntly pointed. Postpetiole twice as broad as long, almost hemispherical; con- 
striction deep and wide. First segment of gaster broader than long. Legs slender. 
Male and female unknown. 
Habitat —South Australia: Ooldea (J. A. Kershaw). 
Promyrmecia exigua sp. nov. 
Plate XV, fig. 64 
Worker. Length 4-4°5 mm. 
Head and gaster blackish-brown, mandibles yellow; antennae, pronotum, meso- 
notum and legs brown or reddish-brown, tarsi of front and middle legs reddish- 
yellow; epinotum and node red. 
Mandibles smooth and shining. Head finely and irregularly reticulate rugose, 
with some faint traces of longitudinal striae on the middle. Thorax and node 
more coarsely reticulate-rugose, rugae almost obsolete on mesonotum, somewhat 
arched on pronotum. Postpetiole and gaster microscopically reticulate. 
