. Bulletin - United States National Museum. Science. 30 NATIONAL MUSEUM BULLETIN 223. Figure 2.—Cross section of reflection globule of Erythrura psittacea (after Sarasin, 1913): 1, Epidermis thinned out, with a pelucid layer; 2, ring of densely massed pigment cells; 3, pigment cells in cellular "padding"; 4, densely massed light-refractive fibers; 5, inner cellular "padding" containing stellate pigment cells (three); 6, transverse section of mandible. foster nest mate, even in cases where the two kinds of young grow up together. The one outstanding exception is the cas
. Bulletin - United States National Museum. Science. 30 NATIONAL MUSEUM BULLETIN 223. Figure 2.—Cross section of reflection globule of Erythrura psittacea (after Sarasin, 1913): 1, Epidermis thinned out, with a pelucid layer; 2, ring of densely massed pigment cells; 3, pigment cells in cellular "padding"; 4, densely massed light-refractive fibers; 5, inner cellular "padding" containing stellate pigment cells (three); 6, transverse section of mandible. foster nest mate, even in cases where the two kinds of young grow up together. The one outstanding exception is the case of the screaming cowbird, Molothrus rufoaxillaris,^^ which is parasitic on the bay-winged cowbird, Molothrus badius.** It is almost impossible to distinguish the young of these species until the advent of the post- juvenal molt. Here we are dealing with two extremely closely related species, and it seems quite obvious that the close resemblance is merely a reflection of a degree of relationship, which happens to work out well in a host-parasite situation (Friedmann, 1929, p. 53). The phyletic proximity is much greater in these two cowbirds than in the viduine-cstrildine picture, but the resulting nestling-plumage condition is comparable in the two. " Molothrus rufoaxillaris Casstn, Proc. Acad. Nat. Sci. Philadelphia, 1806, p. 23 (Buenos Aires, Argentina). " Agelaius badius Bieillot, Nouveau dictlonnaire d'histoire naturelle, 1819, p. 535 (Paraguay and La Plata River).. 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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