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Samples of A.' armstrongiHNS from eastern Australia usually have the striate sculpture of metanotum and propodeum very restricted, and the integument here mostly smooth and shining; the petiolar node tends to be thick at the apex, and in front view, the apical margin is only just barely emarginate, and the corners are broadly rounded.
The largest specimens (HW up to 1.50 mm) are from the mallee country of northwestern Victoria (Duddo Wells, north of Murrayville,
C. Barrett; Ultima, J. C. Goudie); the smallest eastern ones (HW 1.30-1.40 mm) are from Queensland (Roma, F. H. Taylor; 80-100 miles south of Sarina, P. F. and P. J. Darlington). The type series (ANIC-Canberra, MCZ, BMNH-London) is from Nyngan, central New South Wales (fig. 32).
Western Australian samples tend to be smaller (HW down to 1.20 mm, or even slightly less), the striation is more extensive on the sides of the posterior trunk, and the petiolar node is thinner and more distinctly emarginate, thus raising the question as to whether the western populations may not represent a species separate from armstrongiHNS. The samples vary so widely one to the next that I feel such a separation would be premature. This is a question that needs much more material. Present western series available: Toodyay, A. Douglas; Northam, P. McMillan; Mullewa, W. M. Wheeler. AH of the localities appear to lie in zones now agriculturally modified, but originally in dry sclerophyll woodland or mallee.
The samples of A. rectangularisHNS available (MCZ) are from New South Wales: Warrah, W. W. Froggatt. Queensland: Townsville, separate collections by F. P. Dodd and W. M. Wheeler; north of Mareeba, P. F. and P. J. Darlington; Lynd, 500 m, E. S. Ross and D. Q. Cavagnaro; 40 miles SW of Mt. Garnet, 750 m, Ross and Cavagnaro. The samples vary in color from light brownish-yellow to dark brown with blackish gaster. The head is often lighter and more yellowish than is the trunk.
The variety diabolusHNS as described by Forel corresponds to those samples with the petiolar emargination distinct, rendering the upper corners more marked; this condition is found in several series, and seems to be part of the infraspecific variation.
Of A. turneriHNS, I have studied only the types, from Mackay, Queensland (MHN-Geneva, MCZ), b,ut the variety latuneiHNS described by Forel seems to be only a slightly smaller, more lightly sculptured variant, not likely to be a distinct species. R. W. Taylor (in litt.) tells me that he has found A. rectangularisHNS and A. turned to be "widespread in northern Australia", but relatively uncommonly collected. He has independently confirmed the synonymy of their two varieties.
Taylor sends additional records of collections of this group in ANIC-Canberra: A. rectangularisHNS (fig. 36); Queensland: near Dimbulah, 10 miles W of Charters Towers, 14 miles S of Maryborough, Homestead, Brisbane. Northern Territory: 5 km S of Cahills Crossing (12.23S, 132.51E), slopes above Baroalba Spring (12.47S, 132.51E). New South Wales: Bombala. Torres Strait: Prince of Wales Island.
A. turneriHNS (Fig. 33): Queensland: Hinchinbrook Island. Torres Strait: Prince of Wales Island. A. armstrongiHNS: Victoria: Patho, Marysville, Bogan River. New South Wales: Euston, Riverina, Broken Hill, Finlay, 14 miles NW of Leeton, Callubri Station, Talbita, 14 miles N of Quambone. Queensland: St. George, Toobeah, Nindigully, Fletcher, 4 miles WNW of Yelarbon, Helenslee. Western Australia: Mt. Jackson, Weira. South Australia: Mt. Lofty, 25 miles WSW of Mulga Park Head Station.
Taylor also writes of another possibly .undescribed species from northwestern Australia, previously placed in the AN1C collection with armstrongiHNS. He says this form is "rather like paripungensHNS " in structure and sculpture of trunk, "but is as big as armstrongiHNS, with large eyes. It has longer scapes and more generally dispersed and abundant pilosity than do southwestern Australian armstrongiHNS ". This form has been taken at localities in the Hamersley Range, the Kimberleys, and in the Northern Territory: Johnston’s Lagoon, 23 miles SE of Newcastle Waters, Darwin). Taylor proposes and then rejects the hypothesis that these samples could be character-displaced armstrongiHNS under the influence of partly sympatric populations of paripungensHNS in the Darwin area, and perhaps elsewhere in the northwest. A. armstrongiHNS in Western Australia as here defined is a southwestern species, not yet known to occur north of the Geraldton-Mullewa area. We must await samples from the vast reach of arid land between Mullewa and the Hamersleys in order to find out how armstrongiHNS and the possibly undescribed species are related to each other and to paripungensHNS.
Found most commonly in these habitats: 1 times found in sclerophyl forest, 2 times found in Paddock, 2 times found in Red soil plain, 2 times found in Bluebush steppe, 1 times found in Callytris forest, 1 times found in Red soil, sandy woodland, 1 times found in Casuarina flats, 1 times found in Red soil, savannah woodland, 1 times found in Chenopod shrubland on floodplain, 1 times found in Sav., woodlands, ...
Found most commonly in these microhabitats: 2 times Under stone, 1 times under dead wood, 2 times Under cow dung, 1 times Under rock, 1 times Under log, 1 times Under limestone rock, 0 times soil under rock, 1 times Shallow nest in soil, 1 times red soil under rock, 1 times On the ground, 1 times Nest under old pad of cow dung, ...
Collected most commonly using these methods: 2 times intercept, 1 times search, 1 times Berlesate.
Elevations: collected from 75 - 914 meters, 461 meters average
Type specimens: paratype of Anochetus armstrongi: casent0902449