. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. KEAST: HIHI) SPECIATION IX AUSTRALIA 365 habitats, lias budded off a series of species around the periphery of its range that occupy rocky gorges only. In the A. textilis group there is the alternative situation of this species, occupying the western half of the continent, and the eastern A. modest us, each somewhat versatile in choice of habitat, separating out A. textilis â¢â¢â¢A A. modestus A. goyderi RUGGED MOUNTAIN GORGES AND^M^ PLATEAUX J' MOUNTAIN , ^VALLEYS ^*9 AND J Y OPEN / / PLACES I SPINIFEX PLAIN SCRUB /
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. KEAST: HIHI) SPECIATION IX AUSTRALIA 365 habitats, lias budded off a series of species around the periphery of its range that occupy rocky gorges only. In the A. textilis group there is the alternative situation of this species, occupying the western half of the continent, and the eastern A. modest us, each somewhat versatile in choice of habitat, separating out A. textilis â¢â¢â¢A A. modestus A. goyderi RUGGED MOUNTAIN GORGES AND^M^ PLATEAUX J' MOUNTAIN , ^VALLEYS ^*9 AND J Y OPEN / / PLACES I SPINIFEX PLAIN SCRUB / AND THICKETS. AMYTORNIS TEXTILIS SUPERSP OPEN PLAIN (SPINIFEX â >) SCRUB AND TREES PORCUPINE GRASS IN MALLEE Fig. 17a. Amytornis textilis group of desert grass wrens. Distribution of species and their geographic variation in habitat is shown. The black square indicates the restricted range of the heavy-billed A. goyderi (now probably extinct.) A. textilis and A. modestus, relatively similar western and eastern counterparts, secondarily overlap in range (without interbreed- ing) in the mountains of central Australia. Each frequents a range of habitats except in the overlap zone, where one keeps to the rugged gorges and the other to the valleys. Here A. modestus is probably the secondary invader. The letters refer to minor racial forms of A. textilis, and the numbers to those of A. modestus. where their distributions meet. Thus, in the Macdonnell Ranges in central Australia, the former keeps to the rock surfaces of the gorges and plateaux and the latter to the areas of soft spinifex on the valley Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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