A REVISION OF THE GENUS PROMYRMECIA EMERY (FORMICIDAE) 117 
very fine and adpressed, very abundant on postpetiole and gaster but not hiding 
the sculpture, darker on middle of first segment. 
Head very slightly broader than long, strongly convex behind the eyes. 
Mandibles furnished with three strong sharp teeth. Frontal carinae as long as 
broad behind. Scapes one-third longer than broad, and twice as long as first 
segment of funiculus, second segment of funiculus six times longer than first. 
Thorax twice as long as broad. Pronotum five times broader than long, sides and 
front convex. Mesonotum slightly broader than long, convex in all directions, 
mayrian and parapsidal furrows deeply impressed. Scutellum one-third broader 
than long, broadest in front. Epinotum almost twice as broad as long, convex 
laterally ; in profile pronotum erect, convex. Mesonotum high and convex mayrian 
furrows deeply impressed. Scutellum dome-shaped, longer than high. Epinotum 
short, strongly convex from base to foot of declivity. Node one-third broader than 
long, oval; in profile longer than high, anterior face straight, sloping gradually 
backward, posterior face short, convex, rounded into convex dorsum, anterior edge 
bluntly rounded. Postpetiole barely twice as broad as long, sides strongly convex. 
First segment almost one-fourth broader than long. Legs slender. 
Habitat—Western Australia: Perth; Mundaring; Armadale; Bridgetown; 
Albany ; Denmark (J. Clark). 
The workers vary greatly in size’in some nests. The queen is 
huge in bulk in comparison with even the largest workers. As a 
rule in most of the known species there is very little difference in 
the size of the workers and queens. A female from Garden Island 
has the head brown, straighter behind and the whole sculpture 
coarser. 
Promyrmecia chasei Forel var. ludlowi Crawley 
Myrmecia chasei Forel, var. ludlowi Crawley, Ann. Mag. Nat. Hist. (9), 
ix, p. 431, 1922, ¥ ; Crawley, l.c., xvi, p. 578, 1925, ¢. 
Worker. Length 12-15 mm. 
Agrees with P. chasei Forel in all details except colour. The mandibles, antennae 
and legs brown, tarsi reddish. Head, postpetiole and gaster black, the thorax, 
instead of being entirely red, is black on the neck of the pronotum, a large spot on 
centre of mesonotum, lower half of the mesosternum and metasternum. 
Female. Length 22 mm. 
Colour darker than P. chasei, otherwise similar. One fully-developed female 
form Ludlow has no traces of wings. 
Male. Length 14 mm. 
Similar to the male of P. chasei Forel. 
Habitat —Western Australia: Ludlow; Armadale (J. Clark). 
This colour variation is constant; no graduation between the 
two forms has been found. 
The male described from Albany by Crawley is the male of 
chasei, which is common there; the var. ludlowi is not found in 
that locality. 
