. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. KEAST: BIKI) SPECIATION IX AUSTRALIA 359 Speciation in the Major Genera A number of the Australian "sylviid" genera provide excel- lent demonstrations of speciation within the confines of the continent. They can best be considered individually.. EPTHIANURA ALBIFRONS and ASHBYIA SUP. SP. .Fig. 16. Distinctive relict races of the chat, Epthianura eroeea (numbers 1-4 and spotted areas on map) are isolated in river valleys 800-900 miles apart. Distribution of this species, requiring dense ground cover and sub- m

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. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. KEAST: BIKI) SPECIATION IX AUSTRALIA 359 Speciation in the Major Genera A number of the Australian "sylviid" genera provide excel- lent demonstrations of speciation within the confines of the continent. They can best be considered individually.. EPTHIANURA ALBIFRONS and ASHBYIA SUP. SP. .Fig. 16. Distinctive relict races of the chat, Epthianura eroeea (numbers 1-4 and spotted areas on map) are isolated in river valleys 800-900 miles apart. Distribution of this species, requiring dense ground cover and sub- marshy conditions, can only lie explained by the north of the continent formerly having been wetter and providing continuous, or near-continuous, habitat of the right type. The black ellipse indicates the range of Aslibyia lovensis, an inhabitant of the gibber deserts. Though fairly sedentary, its range is continuous and restricted. It does not vary geographically. Epthianura albifrons (see cross-hatched areas) is somewhat nomadic on the mainland (see A) and does not vary geographically. Interruption to gene flow by Bass Strait, however, has led to the development of a minor insular isolate on Tasmania (B). Epthianura and Ashbyia: This group, reviewed in detail else- where (Keast, 1958c), demonstrates the close link between the type of seasonal movements undertaken by species and their tendency to develop morphologically differentiated isolates. Of. 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 work.. Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum