. Bulletin of the British Ornithologists Club. Philip D. Round & Anak Pattanavibool 218 Bull. 2003 123(4) N I. i sec Figure 1. Sonogram of vocalizations of Long-tailed Wren Babbler Spelaeornis chocolatinus, Umphang Wildlife Sanctuary, Tak Province, western Thailand, April 2001. The fist element (a) is a rising, bubbling trill, given by the male, followed by a rasping call (b) given by the female. Robson (2000) documented considerable differences in song among some of these subspecies, implying that S. chocolatinus as presently constituted may be a complex of more than one species, a
. Bulletin of the British Ornithologists Club. Philip D. Round & Anak Pattanavibool 218 Bull. 2003 123(4) N I. i sec Figure 1. Sonogram of vocalizations of Long-tailed Wren Babbler Spelaeornis chocolatinus, Umphang Wildlife Sanctuary, Tak Province, western Thailand, April 2001. The fist element (a) is a rising, bubbling trill, given by the male, followed by a rasping call (b) given by the female. Robson (2000) documented considerable differences in song among some of these subspecies, implying that S. chocolatinus as presently constituted may be a complex of more than one species, and indeed reptatus is treated as a full species by Rasmussen & Anderton (in press). The occurrence of S. c. reptatus on Doi Kajela was highly significant and unexpected, since this site lies over 500 km to the south of the hitherto southernmost records, in Kengtung, E. Myanmar (Bingham 1903, Stanford & Mayr 1941). The absence of records from the avifaunistically similar mountains of Doi Inthanon (2,565 m) and Doi Pha Horn Pok (2,285 m), which lie between Doi Kajela and Kengtung, at 18°35'N, 98°29'E and 20°04'N, 99°09'E respectively, may reflect a genuine distributional patchiness in this taxon, given that these mountains are among the best surveyed sites for forest birds in northern 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 British Ornithologists Club. Oxford : Clarendon Press
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