ij 
A REVISION OF THE GENUS PROMYRMECIA EMERY (FORMICIDAE) 133 
rounded. Mandibles short, almost triangular, inner border furnished with two 
large sharp teeth behind apex, the second forms a sharp angle to basal border. 
Clypeus rounded in front. Scapes short, first segment of funiculus twice as long 
as scapes, second segment one-fifth shorter than first, remainder subequal. Eyes 
large, occupying more than half the sides. Ocelli large and prominent. Thorax 
twice as long as broad. Pronotum five times as broad as long, strongly convex in 
front. Mesonotum almost cone-shaped, one-fifth broader than long, mayrian and 
parapsidal furrows sharply impressed. Scutellum almost as long as broad, broadest 
in front, strongly convex in all directions. Epinotum one-fourth broader than long, 
flat laterally; in profile strongly arched longitudinally. Pronotum erect, convex, 
mesonotum erect in front, convex from apex to base. Scutellum as high as long, 
dome-shaped, Epinotum convex from base to bottom of declivity. Node one-third 
broader than long, convex in all directions; in profile high and dome-shaped, all 
faces convex, ventral spine very short and sharp. Postpetiole one-third broader 
than long, strongly convex behind, constriction deep. First segment of gaster one- 
fourth broader than long. Legs slender. 
Habitat —W estern Australia: Mundaring Weir (type locality) ; Margaret River ; 
Albany; Denmark; Armadale; Perth (J. Clark). 
In size and colour this species is similar to P. pilosula. The 
formation of the mandibles separates them. 
Promyrmecia swalet Crawley 
Plate XVI, figs. 72-73 
Myrmecia harderi Forel, race swalei Crawley, Ann. Mag. Nat. Hist., 9, ix, 
p. 429, 1922, ¥. 
Worker. Length 11-12'5 mm. 
Head, postpetiole and gaster black, thorax and node bright red, mandibles yellow 
on basal half, reddish-yellow on apical half, antennae and legs brown, scapes darker. 
Head longitudinally striate-rugose in front, punctate-rugose behind. Pronotum 
coarsely striate-rugose longitudinally. Mesonotum more irregularly rugose longi- 
tudinally. Epinotum irregularly rugose, transversely rugose on declivity. Node 
circularly rugose. Postpetiole and gaster microscopically reticulate. 
Hair yellow, short and erect, longest on gaster, short and suberect on legs. 
Pubescence yellowish, very fine and adpressed, forming a thin covering on post- 
petiole and gaster but not hiding the sculpture. a 
Head very slightly broader than long, sides strongly convex behind, occipital 
border concave, angles rounded. Mandibles as long as head, external border straight 
or very feebly convex, inner border furnished on the apical half with two large. 
sharp, erect teeth and four very small sharp teeth, on the basal half the teeth are 
short and irregular more or less directed backward. Scapes not extending to 
occipital border by fully their thickness; first and second segments of funiculus 
equal in length, one-fifth longer than third, remainder subequal. Thorax fully 
twice as long as broad. Pronotum twice as broad as long, convex in all directions. 
Mesonotum one-fourth broader than long, oval. Epinotum short, subbordered in 
front, flattened laterally ; in profile evenly convex from apex of pronotum to bottom 
of epinotal declivity, sutures sharp but not deep. Node very slightly broader than 
long, all faces convex; in profile almost square, anterior face vertical, straight, 
twice as high as posterior face, dorsum feebly convex, angles rounded, ventral spine 
short, thin and sharp. Postpetiole two-fifths broader than long, strongly convex 
almost hemispherical in front; constriction deep and narrow. First segment of 
gaster one-seventh broader than long. Legs rather slender. 
