. Bulletin of the British Ornithologists' Club. Birds. F. C. Barajas L. & A. R. Phillips 40 Bull. 1994 114(1). Figure 1. Comparison of our $ (far right) to other Middle American $$; right to left: Volcan Tacana, Chiapas (MICH ";, 21 March 1939); "Volcan Tacana, Chiapas" (RTM); Montecristo, Santa Ana, El Salvador (AMNH, 26 November 1975); and southern Costa Rica (Talamanca Cordillera, AMNH, 4 May 1967). mostly of unknown age, plumage, breeding condition (or at times even sex, when young), from far-scattered places, the meaning of the observed variations is unc
. Bulletin of the British Ornithologists' Club. Birds. F. C. Barajas L. & A. R. Phillips 40 Bull. 1994 114(1). Figure 1. Comparison of our $ (far right) to other Middle American $$; right to left: Volcan Tacana, Chiapas (MICH ";, 21 March 1939); "Volcan Tacana, Chiapas" (RTM); Montecristo, Santa Ana, El Salvador (AMNH, 26 November 1975); and southern Costa Rica (Talamanca Cordillera, AMNH, 4 May 1967). mostly of unknown age, plumage, breeding condition (or at times even sex, when young), from far-scattered places, the meaning of the observed variations is uncertain. Some may even be due to wear and fading in life, or to post-mortem changes; rarely do we know what preservatives were used, or how carefully. Widespread terrestrial birds (unless highly migratory) commonly vary geographically in size and colour, often dramatically: Colinus virginianus, Motacilla spp., Ammodramus sandwichensis, Melospiza melodia, etc. With elusive species like Haplospiza, our best chance to eventually understand their colour variations would be by promptly comparing any we may capture to detailed colour standards—just as we must compare, and preferably paint, species that fade rapidly after death (see for example Phillips & Rook 1965 and Phillips 1991 on Catharus dryas). We cannot safely foresee the amount of change. (Less obvious changes probably require direct comparison to fresh material, as shown for Pacific populations of Vireo huttoni by Rea, in Phillips 1991: 183-186.). 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. London : The Club
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