A REVISION OF THE GENUS PROMYRMECIA EMERY (FORMICIDAE) 135 
vertical and parallel, basal half of anterior face sloping forward at an acute angle, 
dorsum feebly convex, ventral spine very short and slender. Postpetiole almost 
one-third broader than long, strongly convex in all directions ; constriction between 
postpetiole and first segment of gaster deep and wide. First segment of gaster 
slightly broader than long, strongly convex. Legs robust. 
Female and male unknown. 
Habitat —W estern Australia: Albany (J. Clark). 
Resembles P. swalei Crawley, but more slender; the colour of 
the legs and antennae are very different. 
Promyrmecia dixoni sp. nov 
Plate XVI, figs. 77, 78 
Worker. Length 9-5-10°5 mm. 
Head and gaster black, mandibles yellow, antennae, thorax, nodes and legs 
brownish-red, base of scapes darker. 
Basal half of mandibles finely punctate, apical half obliquely striate. Head longi- 
tudinally striate in front, longitudinally striate-rugose behind, interstices very finely 
and densely punctate. Pronotum longitudinally striate, mesonotum longitudinally 
striate-rugose. Epinotum and node coarsely punctate-rugose, declivity coarsely 
striate transversely. Postpetiole and gaster microscopically reticulate. 
Hair yellow, erect, short and sparse throughout, longer and more abundant on 
apical segments of gaster, a few much longer and stouter on mandibles, fine, short 
and suberect on scapes and legs. Pubescence white, sparse except on postpetiole, 
gaster and legs. 
Head one-sixth broader than long, sides feebly convex, occipital border feebly 
concave, angles rounded. Mandibles slightly longer than head, external border 
concave, inner border furnished with three large sharp teeth, feebly curved back- 
ward, in front and between each of these are two much smaller, behind the third 
large tooth the teeth are obsolete and directed backwards, the two at extreme 
base slightly larger. Frontal carinae as long as broad in front. Scapes not reaching 
the occipital border by fully their thickness, first and third segments of funiculus 
equal in length, very slightly shorter than second, apical almost twice as long as 
the preceding. Thorax twice as long as broad. Pronotum twice as broad as long, 
strongly convex in all directions. Mesonotum almost one-third broader than long, 
strongly convex, meso-epinotal constriction deep and wide. Epinotum slightly 
longer than broad, almost straight in front; in profile anterior face of pronotum 
erect, straight or feebly convex, at an acute angle, strongly rounded into the rather 
flat dorsum. Mesonotum higher than pronotum and epinotum, strongly convex, 
meso-epinotal suture sharply, but not deeply, impressed. Epinotum convex from 
base to foot of declivity. Node one-fifth broader than long, strongly convex in all 
directions; in profile one-fifth higher than long, anterior face high, straight and 
vertical, posterior face short and vertical, dorsum convex, dropping behind and 
rounded into posterior face; ventral spine short and sharp. Postpetiole almost 
twice as broad as long, sides, front and dorsum strongly convex, constriction 
narrow and deep. First segment of gaster broader than long, sides and dorsum 
strongly convex. Legs slender. 
Female. Length 12 mm. (dealated). 
Colour and pilosity as in the worker, sculpture coarser. Mandibles and scapes 
shorter, node and postpetiole much broader. 
Male. Unknown. 
L 
