AUSTRALIAN FORMICIDAE 
91 
behind, produced backward neck-line, sides feebly convex. Mandibles as in 
the major, but the teeth strong. Clypeus strongly raised longitudinally in 
the middle, subcarinate, the denticles on anterior border smaller and more 
obsolete. Frontal carinae narrower, particularly in front. Scapes extend 
beyond the occipital border by half their length; third and fourth segments 
of funiculus one-fourth longer than first and second. Eyes large, globular, 
placed behind the middle of sides. Thorax three times as long as broad, 
sutures sharply impressed. Pronotum as long as broad, cone-shaped, 
broadest behind. Mesonotum as long as broad in front, twice as broad in 
front as behind. Mesonotum one-fourth broader than long, oval. Epinotum 
one- third longer than broad; in profile dorsum similar to that of the major 
but the epinotum longer and the declivity shorter, dorsum twice as long as 
declivity. Node one-fifth longer than broad, oblong, sides straight and 
parallel, anterior and posterior faces silghtly convex, angles rounded; in 
profile as long as high, almost triangular, anterior faces convex directed 
backward, posterior face feebly convex directed forward, top sharp pointed. 
Gaster barely twice as long as broad. Legs long and slender. 
Miale and female unknown. 
Habitat. — Victoria: Near Mildura (Mrs. M. J. Zimmer). 
Near C. (T.) spinitarsus Emery, but is distinguished by 
the shape of the thorax and node. 
Genus POLYRHACHIS Smith. 
Journ. Linn. Soc. Lond., Zool., ii, p. 58, 1857. 
Subgenus Myrmhopla Forel. 
Arkiv. f. Zool., ix, p. 107, 1915. 
Polyrhaciiis (Myrmhopla) exulans sp. nov. 
Plate XIII, Fig. 24. 
Worker. Length 5 5-6 mm. 
Black throughout, legs somewhat brownish black. 
Mandibles shining, with scattered piligerous punctures. Head, thorax 
and node finely and very densely reticulate; scapes, legs and gaster more 
finely and superficially reticulate. 
Hair yellow, erect, confined to clypeus and apical segments of gaster. 
Pubescence white, very fine and adpressed, abundant throughout, longer 
and more abundant on gaster forming a distinct covering almost hiding the 
sculpture. 
Head as long as broad, almost circular. Mandibles furnished with large 
sharp teeth. Clypeus twice as broad as long, broadly convex, produced 
convex in front with a broad triangular depression in the middle. Frontal 
area triangular. Frontal carinae almost twice as long as broad, as broad in 
front as behind, concave in the middle. Scapes extend beyond occipital 
border by fully half their length; first segment of funiculus one-seventh 
longer than the three following. Eyes placed behind middle of sides. 
Thorax one and three-fifths times longer than broad, pro-mesonotal suture 
