. Bulletin of the British Ornithologists' Club. Birds. J. D. Wilson 120 1989 109(2) "i I I r _0° — 5°S Vogelkop IRIAN JAYA PAPUA NEW GUINEA -10°S. Adelbert Mts. uon Peninsula 130°E 135c 140c 145° 150°E Figure 1. Map showing known distributions of Pachycephalopsis hattamensis (rightward diagonal) and P. poliosoma (leftward diagonal). The range of P. poliosoma at the western end of central New Guinea overlaps that of P. hattamensis (cross hatching). Type locality (Magidobo) of P. h. lecroyae, relative to Papua New Guinea-Irian Jaya border, is indicated. Modified from Diamond (19
. Bulletin of the British Ornithologists' Club. Birds. J. D. Wilson 120 1989 109(2) "i I I r _0° — 5°S Vogelkop IRIAN JAYA PAPUA NEW GUINEA -10°S. Adelbert Mts. uon Peninsula 130°E 135c 140c 145° 150°E Figure 1. Map showing known distributions of Pachycephalopsis hattamensis (rightward diagonal) and P. poliosoma (leftward diagonal). The range of P. poliosoma at the western end of central New Guinea overlaps that of P. hattamensis (cross hatching). Type locality (Magidobo) of P. h. lecroyae, relative to Papua New Guinea-Irian Jaya border, is indicated. Modified from Diamond (1985: 89). White-eyed Robin P. poliosoma Sharpe 1882, the eastern member, is a mid-montane (1000-1700 m) species of the Central Ranges, Adelbert Mountains, North Coastal Range and mountains of the Huon Peninsula. Whereas this distribution extends through Papua New Guinea into eastern Irian Jaya, Indonesia, that of the Green-backed (or Western White-eyed) Robin P. hattamensis (Meyer) 1874 has been considered restricted to slightly lower altitudes (600—1640 m) in Irian Jaya (Vogelkop, Wandammen, Weyland, Nassau, Oranje and Foya Mountains, and Yapen Island) (Beehler et al. 1986, Mayr 1986). A recent collection of birds made by Ken Aplin from Magidobo (06°H'S, 142°46'E; 1450 m ), Papua New Guinea, and received in spirit, contained one specimen of P. poliosoma and 2 of P. hattamensis, the latter extending the range of the species eastward by some 400 km and constituting the first record from the Papuan side of the island (Fig. 1). Four subspecies of P. hattamensis are currently recognized (Diamond 1985, Mayr 1986): hattamensis (Meyer 1874) (Vogelkop); ernesti Hartert 1930 (Wandammen Mountains); axillaris Mayr 1931 (Weyland, Nassau and Oranje Mountains); and insularis Diamond 1985 (Yapen Island). The Magidobo birds most closely resemble hattamensis and axillaris, but plu- mage differences are apparent between the new specimens and each of the named forms. Accordingly,
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