. Bulletin of the British Ornithologists' Club. Birds. [ ioj(i)] 20 Colombian Coot and no particular increase in diversity; but a high diversity is found wherever both main morphs are well established. A bird from Lake Cocha in Narino had a red zone from the frontal shield down the tomium, a detail typical of Red-gartered Coots. One bird from Cumbal in Narino had a chestnut subterminal spot on the upper mandible. Similar spots have been found, though, as rare anomalies, as far south as in Lake Titicaca (i6°S, 69°W) and I have seen it also in a White-winged Coot from Argent
. Bulletin of the British Ornithologists' Club. Birds. [ ioj(i)] 20 Colombian Coot and no particular increase in diversity; but a high diversity is found wherever both main morphs are well established. A bird from Lake Cocha in Narino had a red zone from the frontal shield down the tomium, a detail typical of Red-gartered Coots. One bird from Cumbal in Narino had a chestnut subterminal spot on the upper mandible. Similar spots have been found, though, as rare anomalies, as far south as in Lake Titicaca (i6°S, 69°W) and I have seen it also in a White-winged Coot from Argentina. According to my field experience, the latter species may show a dimorphic shield colour (orange-scarlet or yellow). A disposition for polymorphic variation and for occurrence of bill-spots may thus be evolution- arily older than the speciation in the Fulica americana\alai\ardesiaca\atra\ caribeajcristatajleucoptera complex, and the various characters may con- sequently have only slight genealogical information value. There is no geographical trend in measurement within the range of the Andean Coot. The only particularly small (columbiana-si'zz&) individual I found was from Peru, far away from any possible hybridization zone. The general colour tone is almost identical in Colombian and Andean Coots. Extensive white apical markings on the inner secondaries are most typical of Nearctic, White-winged and Old World Coots. The extent of such markings was quantified according to a 12-point scale, zero meaning no white, 12 the state typical of a Nearctic Coot. Colombian Coots gave a mean 80°W / 70° W / / 10"N— ^ Fard. atrun 10°S- 20°S- / 80° W. 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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