ANTS FROM THE OTWAY RANGES. 
Monomorium ( Notomyrmex ) hemiphaeum, sp. nov. 
(PI. IV, fig. 19-20.) 
Worker. — Length, 2. 8-3. 5 mm. 
Bright ferruginous ; eyes, apex of first and whole of second and third 
segments of gaster black. 
Smooth and shining throughout, mandibles strongly punctate. Hair 
yellow, long and erect, abundant throughout, shorter on antennae and legs. 
Head one-fifth longer than broad, sides convex, occipital border straight 
or feebly convex, angles strongly rounded. Mandibles half as long as head, 
furnished with four strong sharp teeth behind the apex. Clypcus projecting 
strongly in front, the anterior border straight. Frontal carinae very short 
and widely separated. Scapes not extending to occipital border by about their 
thickness ; first segment of funiculus as long as the three following together, 
second to eighth broader than long, ninth and tenth as long as broad, apical 
fully twice as long as broad and as long as the six preceding together. Eyes 
small and convex. Thorax twice as broad as long. Pro-mesonotal suture 
feebly marked. Meso-epinotal suture deeply impressed. Pronotum one and 
one-half times broader than long. Mesonotnm as long as broad, much narrower 
behind than in front. Epinotum as long as broad, with a feeble longitudinal 
impression in the middle, posterior border concave. In profile pronotum and 
mesonotum united in a strong convexity, without an impression at the suture. 
Meso-epinotal excision deep and broad. Epinotum convex, the declivity very 
short and rounded into dorsum. Node slightly broader than long, almost 
circular ; in profile the anterior face at an oblique angle, slightly concave, 
dorsum and posterior face united in a convexity, almost two-thirds longer 
than the stalk in front ; a feeble tooth in front below. Postpetiole slightly 
broader than node, circular, in profile almost circular, smaller than node. 
First segment of gaster very slightly longer than broad, twice as broad behind 
as in front. Sides strongly convex. 
Female. — Length, 3.7 mm. (Ergatoid.) 
Colour, sculpture and pilosity as in the worker. Eyes much larger, placed 
nearer to front of head. Ocelli large and convex. Thorax more robust. 
Pro-mesonotal suture scarcely visible. Pronotum and mesonotum equal in 
length. Scutellum half as long as mesonotum, sutures well impressed. Meta- 
notum short but distinct. Epinotum concave behind, the posterior angles 
short ; in profile convex longitudinally, metanotal sutures only showing on 
dorsum, the other sutures well impressed on sides ; but without traces of 
wing pads. Epinotal declivity short, slightly convex, angles bluntly rounded. 
Node and postpetiole as in the worker, but the tooth on ventral surface more 
plate-like. Gaster much larger. 
Habitat. — Beech Forest, 3 nests ; .Gellibrand, one small nest. 
Near M . (N) leae Forel from Tasmania but smaller. The 
epinotum and nodes differently shaped. 
Monomorium ( Notomyrmex ) rubriceps Mayr, var. cincta Wheeler. 
Proc. Amer. Acad. Sc. Washington, 3, p. 114, fig. 3, 1917, 2 $ . 
A large colony of this variety was found nesting in a rotten 
log at Gellibrand. 
[ 61 ] 
