92 
AUSTRALIAN FORMICIDAE 
sharply impressed. Pronotum, on dorsum, very slightly broader than long, 
sides straight, sharply rounded but not margined, convex in front, each 
anterior angle furnished with a long sharp spine, twice as long as broad at 
base, directed outward and slightly forward and upward. Mesonotum 
slightly broader than long, convex in all directions. Epinotum broader 
than long, convex laterally, posterior angles each furnished with a long 
slender sharp spine, three times as long as broad at base, their distance apart 
at base equal to half their length; in profile slightly and abruptly raised 
convex in front, straight and sloping behind in middle, basal fourth convex, 
anterior spines directed forward. Mesonotum convex. Epinotum straight, 
slightly shorter than the declivity, posterior spines slender directed upward 
and backward, declivity straight. Node twice as broad as long, each angle 
furnished with a long sharp spine encompassing the gaster, fully three times 
longer than broad at base, curved outward and backward; in profile higher 
than long, twice as broad at base as on top, anterior face vertical and 
straight, posterior face convex directed forward and upward. Gaster 
slightly longer than broad. Legs long and slender. 
Male and female unknown. 
Habitat. — Northern Territory. Koolpinyah (C. L. Barrett, 1933). 
Smaller and more slender than P. (M.) clotho Forel, the 
sculpture and pilosity also are different. 
Subgenus Campomyrma Wheeler. 
Science, xxxiii, p. 360, 1911. 
Polyrhacliis (Campomyrma) simmerae sp. nov. 
Plate XIII, Fig. 25. 
Worker. Length 11-12 mm. 
Black; mandibles, clypeus, funiculi and legs reddish brown. 
Head, thorax and node finely and densely reticulate, gaster more finely 
and densely reticulate. 
Hair yellow, long and erect on mandibles, clypeus and apex of gaster, 
none elsewhere on body, short and suberect on antennae and legs. Pubescence 
nil. 
Head one-ninth longer than broad, sides and occipital border feebly 
convex, angles rounded, lateral border sharp from margin of eyes to 
occipital border. Mandibles furnished with four or five strong sharp teeth. 
Clypeus large, one-third of length of head, anterior border broadly produced, 
furnished with numerous short, sharp teeth-like spines in front. Frontal 
area, small and triangular. Frontal carinae one-third longer than broad 
behind. Antennal insertions exposed. Scapes extend beyond occipital 
border by fully half their length; second, third and fourth segments of 
funiculus equal in length, slightly shorter than first, apical barely as long 
as first. Eyes large, placed about one-third of their diameter from the 
posterior border. Thorax fully twice as long as broad, sides strongly 
margined, sutures sharply impressed. Pronotum, across the spines, about 
one-third broader than long, convex in front, the angles produced laterally 
as broad sharp spines, sides slightly convex in middle, lateral borders 
