. Bulletin of the British Ornithologists' Club. Niels Krabbe 220 Bull. 2008 128(4) Results Vocalisations.—A total of 196 song phrases (from 5-6 different individuals) of rufipectus were analysed. Songs consisted of resonant notes (3-4 harmonics), given in a series of 4-6 simi- lar notes, loudest at 1,800-3,000 Hz (second or third harmonic). Individual notes were up-downstrokes, the downstroke slightly more pronounced, and the peak volume at high- est pitch. The loudest pitch was the second harmonic (1,800-2,000 Hz) in two or three individuals, the third harmonic (2,400-3,000 Hz) in two
. Bulletin of the British Ornithologists' Club. Niels Krabbe 220 Bull. 2008 128(4) Results Vocalisations.—A total of 196 song phrases (from 5-6 different individuals) of rufipectus were analysed. Songs consisted of resonant notes (3-4 harmonics), given in a series of 4-6 simi- lar notes, loudest at 1,800-3,000 Hz (second or third harmonic). Individual notes were up-downstrokes, the downstroke slightly more pronounced, and the peak volume at high- est pitch. The loudest pitch was the second harmonic (1,800-2,000 Hz) in two or three individuals, the third harmonic (2,400-3,000 Hz) in two individuals, and second and third equally loud in one individual. The song was usually given in sets of two (less commonly one, rarely three) phrases, with a brief pause of seconds between the two phrases. The first of the two phrases frequently had an extra, often slightly weaker and lower pitched introductory note, and was thus longer ( ± seconds) than the second ( ± seconds). The double phrases were delivered fairly regularly with pauses between them 2-4 seconds long. All the individuals of rufipectus compared had similar songs, differing in virtually all aspects from songs of other forms of Automolus rubiginosus (Figs. 2a-i, 3a-b), the only simi- larities being the length of the song phrases and the tendency of rufipectus to deliver two song phrases in succession, a tendency also noticed in some individuals of other forms of A. rubiginosus from both Central America {rubiginosus, veraepacis, saturatus) and the Amazon (unnamed taxon). The song of rufipectus was more similar, indeed remarkably so, to the song of Hylocryptus erythrocephalus (Fig. 3b-c). Calls of rufipectus recorded were churrs, two- to three-noted whilst foraging (Fig. 4d) and three- to four-noted when given in alarm (Fig. 4e), at kHz (first and second, or second and third harmonic), lower pitched than song and differing distinctly from calls of both A. rubiginosus (Fig. 4a
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