116 A REVISION OF THE GENUS PROMYRMECIA EMERY (FORMICIDAE) 
Myrmecia (Myrmecia) chasei Crawley, Ann. Mag. Nat. Hist. (9), ix, p. 431, 
1922, %. 
Myrmecia (Promyrmecia) mediorubra Wheeler, Colony-founding among 
Ants, p. 58, 1933, %. 
Worker. Length 12-15-5 mm. 
Head, postpetiole and gaster black, antennae and legs brown, mandibles, apical 
segments of funiculus and tarsi yellow, thorax and node light red. ; 
Front half of mandibles striate, base smooth, finely punctate. Head finely striate 
longitudinally, the striae widely spaced; very finely and densely punctate between 
the striae. Pronotum, mesonotum and front of epinotum sculptured as on the head 
but the striae large, epinotal declivity transversely striate, node circularly striate 
with a strong central longitudinal carina. Postpetiole and gaster densely and 
microscopically punctate. 
Hair whitish, short and erect, abundant throughout. Pubescence white, very 
fine and adpressed on head and thorax, long and more abundant on postpetiole 
and gaster, on the middle of first segment it is yellowish and dense, almost hiding 
the sculpture. 
Head very slightly broader than long, straight or feebly concave behind, the 
angles broadly rounded into sides. Mandibles a fraction longer than head, external 
border straight, inner border furnished with five large erect teeth, with a smaller 
tooth between each. Frontal carinae erect, longer than broad behind. Scapes 
extend to occipital border ; second segment of funiculus one-third longer than first. 
Thorax twice as long as broad. Pronotum fully twice as broad as long, strongly 
convex all ways. Mesonotum almost one-fourth broader than long. Epinotum one 
and one-half times longer than broad; in profile pronotum convex from base to 
apex. Mesonotum convex, raised above level of pronotum and epinotum, meso- 
epinotal suture narrow and deep, epinotum convex from base to foot of declivity. 
Node one and one-half times broader than long, oval; in profile higher than long, 
anterior face short and vertical, posterior edge sharply rounded, Ventral spine 
short and sharp. Postpetiole twice as broad as long, sides and front strongly convex. 
First segment of gaster one-sixth broader than long. Legs short and stout. 
Female, Length 22-24 mm. 
Colour as in the worker, but there is a brown spot on each side of the dorsum 
of scutellum and one on each side of dorsum of node. Wings hyaline. Sculpture 
and pilosity similar, but the pubescence darker and more abundant on gaster. 
Head one-fifth broader than long, occipital border straight or feebly concave, sides 
feebly convex, angles broadly rounded. Mandibles as long as head, external border 
convex, inner border convex, furnished with five large, sharp, erect teeth with a 
smaller tooth between each. Scapes not extending to occipital border by fully twice 
their thickness ; second segment of funiculus very slightly longer than first. Mayrian 
furrows indicated but not impressed. Node twice as broad as long, broader behind 
than in front, sides strongly convex, posterior border feebly convex, anterior border 
concave in middle. Postpetiole twice as broad as long, almost oval. First segment 
of gaster broader than long. Legs short and robust. 
Male. Length 14-5 mm. 
Black; a large spot on each side of pronotum, the whole of the mesonotum, 
epinotum and node yellowish-red, mandibles and legs blackish-brown, antennae and 
tarsi reddish-brown. 
Head, thorax and node coarsely punctate-reticulate, postpetiole and gaster very 
densely and finely punctate. 
Hair yellowish-white, erect, long and abundant throughout, pubescence white, 
