. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. 6. Lateral view of the head of Penelope purpuroscens with erected crest feathers. Drawn from a photograph of a captive bird. Fig. 7. Lateral view of the head of Penelope pipile jacu- finga showing the dewlap. cumancnsis, P. purpuroscens, and Abiirria aburri. In birds other than cracids, attenuated primaries may be present or absent in closely related species, as in the genus Falcipennis of the Tetraoninae. The Asiatic species F. falcipennis has modified pri- maries, while the North American one, the Spruce Grouse
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. 6. Lateral view of the head of Penelope purpuroscens with erected crest feathers. Drawn from a photograph of a captive bird. Fig. 7. Lateral view of the head of Penelope pipile jacu- finga showing the dewlap. cumancnsis, P. purpuroscens, and Abiirria aburri. In birds other than cracids, attenuated primaries may be present or absent in closely related species, as in the genus Falcipennis of the Tetraoninae. The Asiatic species F. falcipennis has modified pri- maries, while the North American one, the Spruce Grouse F. {'^Canachites") canaden- sis, does not. Such a difference also occurs, for instance, in some Tyrannidae. "The male [of Etiscarthmornis g. granadensis] was heard giving a wing buzz suggestive of a manakin; this undoubtedly is produced by the especially attenuate four or five outer primaries. Such a modification of the pri- maries is not evident in Euscarthmornis margaritaceiventris, a number of specimens of which are at hand" (Miller, 1963: 32). It is obvious, then, that a character such as the attenuate condition of the primaries in some birds would be only of specific value taxonomically. 5) Tracheal Loop Con\ olutions of the trachea over the pec- toral musculature occur in several groups of birds. Garrod (1879) listed some cracid species presenting this particularity, and Forbes (1882) mentioned many more. Fur- ther notes on cracid tracheal morphology were included by Wetmore (1926), Miller (1947, 1952), Wagner (1953), and Schafer (1953). In Crax the tracheal loop is exident in the male only, and in C. daubenfoni (Scha- fer, 1953) the loop seems absent outside of. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Mus
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