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1/. Very dark brown, mandibles (except masticatory and basal borders, which are black), antennae, apex of spines, clypeus, part of front and cheeks, epinotum, and parts of sides of thorax reddish, tarsi and articulations of the limbs yellowish. Whole body furnished with longer and shorter, scattered erect yellow hairs.
* Barumtaun was the name of Miss Cheesman's camp.
Head sub quadrate ; posterior border very emarginate in centre, forming large side lobes with rounded posterior angles ; with strongly raised longitudinal ridges anteriorly, straight and regular in the front, curving outwards at the sides with some of the interstices covered with very small raised tubercules ; posterior part of head (lobes) closely concentrically striate. Mandibles massive, convex, smooth, and shining, with a few shallow scattered punctures; masticatory margin without teeth ; clypeus raised in centre and with a carina, longitudinally striate at sides barumtaunHNS, sp. n. Fig. 2.-Lateral view of thorax of worker of P. (P.) barumtaunHNS, sp. n.
of anterior border, which is emarginate in centre ; frontal area narrow, smooth, shining, rather deeply scooped out with rounded basal border, a narrow furrow extends to base of head, becoming much deeper between the lobes ; antennal carinae divergent posteriorly ; antenna} short ; scape not quite reaching the transverse striae of the lobes of head ; funiculus with last three joints slightly longer than the rest ; eyes small, situated in front of centre of sides of head. Thorax smooth and shining; pronotum furnished with two long, strong, pointed spines projecting outwards, and slightly forwards at apex, a little longer than a third of the length of the thorax ; mesonotum with a raised transverse carina with sharp small teeth at each corner ; epinotum with two long spines projecting outwards and curving slightly backwards at apex, not as long as those of the pronotum, dorsal surface of epinotum slightly convex, declivity abrupt, of equal length to dorsal surface, slightly concave ; petiole long and narrow anteriorly, with a thin, raised, rather high transverse projection posteriorly ; post-petiole narrow, transverse, transversely striate, with a short projecting tooth at each side ; gaster round, smooth, and shining.
Long. 6 mm.
[worker]. Colour and hairs much as in the [soldier], only in some specimens the dark brown parts are nearly black. Very smooth and shining.
Head rounded in front and behind, posterior border margined ; mandibles long, longitudinally striate, and with a few scattered punctures, masticatory border furnished with two long sharp teeth at apex, two shorter ones close to them, and one short tooth just before base ; clypeus convex with a round projection before frontal area ; frontal area shallow with well-marked side borders, rounded at base ; frontal carinse short, pointed at apex ; antennal foveae concentrically striate ; antennae long ; scape extending beyond posterior border of head by nearly half its length ; funiculus with last three joints about as long as the rest. Thorax narrow ; pronotum armed with two long divergent spines, projecting forwards and curving slightly downwards at apex, about as long as two-thirds of the thorax ; mesonotum armed with two short, erect acute spines ; epinotum armed with two long curved spines, pointing backwards, not as long as those on the pronotum, with two short acute spines projecting upwards a little before the middle of the epinotal spines. Petiole long and narrow, raised to a projecting blunt ridge at apex ; post-petiole broader than petiole, narrowed in front, dorsal surface round ; gaster oval.
Long. 3.2 mm.
[Male]. Dirty pale yellow, head behind front and at sides of and behind eyes black, scutum of mesonotum and scutellum marked with blackish patches, sides of thorax and middle of femora and tibiae brownish.
Typical PheidoleHNS male ; ocelli large, situated on a prominence at back of head ; mandibles small, armed with two small sharp teeth ; Mayrian furrows not very distinct. Wings iridiscent ; one discoidal cell, one large and one small cubital cell, and a long closed radial cell present, pterostigma and veins yellow.
Long. 4.2 mm.
Described from eight soldiers, a number of workers, and four males, taken by Miss L. E. Cheesman in a nest in rotten wood on Mount Lina, Cyclops Mountains. Dutch New Guinea, 3500-4500 ft., March 1936.
Types in Brit. Mus. Coll.
This ant is quite distinct from all the other known species of this interesting subgenus.
It is perhaps as well to mention here that in my opinion Pheidole (Pheidolacanthius) armata SmithHNS [Journ. Proc. Linn. Soc. Lond., Zool. viii. p. 75, pl. iv. fig. 8 (1864) sub Pheidolacanthinus armataHNS] is the soldier and P. (P.) quadrispinosa SmithHNS [Journ. Proc. Linn. Soc. Lond., Zool. viii. p. 72, pl. iv. fig. 6 (1864) sub Myrmica quadrispinosaHNS] is the worker of the same species. Which being the case the former name will sink as a synonym. Professor G. Hale Carpenter has kindly lent both types to me, and both were taken by A. R. Wallace at Salwaty, New Guinea.
Found most commonly in these habitats: 7 times found in Montane primary rainforest.
Found most commonly in these microhabitats: 1 times Under loose bark of log, 1 times In & under living bark of recently felled tree, 1 times Decayed stalk in Pandanus sp., 1 times Crown of Pandanus, 1 times Sifted mixed leaf litter, 1 times Foragers in leaf litter, 1 times Ex. Sifted mixed leaf litter.
Elevations: collected from 1067 - 1219 meters, 1106 meters average