. Bulletin of the British Ornithologists' Club. Birds. Weller ISA- Bull 1998 118(4). -17° -16^ 15= r 95 Figure 1. Collecting sites (filled triangles) oi Amazilia heryllina sumichrasti in Oaxaca and Chiapas, southern Mexico. difference of the duller plumage and sexual dimorphism in the tail coloration, to ^. h. lichtensteini. Intergradation of ^. h. devillei with the nominate form as supposed by Friedmann et al. (1950) and Binford (1989) can be excluded not only for reasons of coloration but also of distribution, because there is possibly a separation from the most northwestern pop
. Bulletin of the British Ornithologists' Club. Birds. Weller ISA- Bull 1998 118(4). -17° -16^ 15= r 95 Figure 1. Collecting sites (filled triangles) oi Amazilia heryllina sumichrasti in Oaxaca and Chiapas, southern Mexico. difference of the duller plumage and sexual dimorphism in the tail coloration, to ^. h. lichtensteini. Intergradation of ^. h. devillei with the nominate form as supposed by Friedmann et al. (1950) and Binford (1989) can be excluded not only for reasons of coloration but also of distribution, because there is possibly a separation from the most northwestern population of the race lichtensteini in Oaxaca. Additional distributional data on these subspecies are necessary to determine their range boundaries. I presume that A. h. sumichrasti is restricted to the southwestern slopes of the Sierra Madre and the Montaiias del Norte (as indicated by the MLZ series from Yerba Buena, and adjacent heryllina localities in the ECOSUR data bank). With the fragmentary data at hand, it is problematic to estimate if the sumichrasti populations are connected or separated by the valley of the Rio Grijalva/Presa de la Angostura in interior Chiapas (Fig. 1), where original woodlands have been widely cleared (Howell & Webb 1995). Altogether, the appearance of morphological characters in the southern heryllina subspecies indicates microevolutionary processes as a result of isolation of preliminary taxa groups. As has been suggested for numerous Central American taxa, including Amazilia species (Howell 1993), climatic changes in glacial and interglacial periods which 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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